ercot load research sample to profile comparison july 24, 2006 busnodemcoast reflecting prospective...

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ERCOT ERCOT Load Research Sample Load Research Sample to Profile Comparison to Profile Comparison July 24, 2006 BUSNODEM BUSNODEM COAST COAST Reflecting Prospective 2006 Reflecting Prospective 2006 AV Profile ID Changes AV Profile ID Changes

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Page 1: ERCOT Load Research Sample to Profile Comparison July 24, 2006 BUSNODEMCOAST Reflecting Prospective 2006 AV Profile ID Changes

ERCOTERCOTLoad Research Sample to Load Research Sample to Profile Comparison Profile Comparison

July 24, 2006

BUSNODEMBUSNODEMCOASTCOAST

Reflecting Prospective 2006 Reflecting Prospective 2006 AV Profile ID ChangesAV Profile ID Changes

Page 2: ERCOT Load Research Sample to Profile Comparison July 24, 2006 BUSNODEMCOAST Reflecting Prospective 2006 AV Profile ID Changes

2

Distribution of Sample PrecisionDistribution of Sample Precision

90% Confidence

0

1,000

2,000

3,000

4,000

5,000

6,000

Percent Accuracy

Inte

rva

l Co

un

t

BUSNODEMBUSNODEMCOASTCOAST

Page 3: ERCOT Load Research Sample to Profile Comparison July 24, 2006 BUSNODEMCOAST Reflecting Prospective 2006 AV Profile ID Changes

3

Profile and Sample ComparisonProfile and Sample Comparison

1 Day of lowest total absolute kWh difference for 01/01/05 thru 12/31/05

Comparison for 01/09/05

0.0

0.1

0.2

0.3

0.4

0.5

0.6

0.7

0.8

Interval

kW

h

Sample Profile Lower Confidence Limit Upper Confidence Limit

1

(Sunday)

BUSNODEMBUSNODEMCOASTCOAST

Page 4: ERCOT Load Research Sample to Profile Comparison July 24, 2006 BUSNODEMCOAST Reflecting Prospective 2006 AV Profile ID Changes

4

Profile and Sample ComparisonProfile and Sample Comparison

2 Day of 25th percentile total absolute kWh difference for 01/01/05 thru 12/31/05

Comparison for 05/14/05

0.0

0.1

0.2

0.3

0.4

0.5

0.6

0.7

0.8

Interval

kW

h

Sample Profile Lower Confidence Limit Upper Confidence Limit

2

(Saturday)

BUSNODEMBUSNODEMCOASTCOAST

Page 5: ERCOT Load Research Sample to Profile Comparison July 24, 2006 BUSNODEMCOAST Reflecting Prospective 2006 AV Profile ID Changes

5

Profile and Sample ComparisonProfile and Sample Comparison

3 Day of median total absolute kWh difference for 01/01/05 thru 12/31/05

Comparison for 06/25/05

0.0

0.1

0.2

0.3

0.4

0.5

0.6

0.7

0.8

Interval

kW

h

Sample Profile Lower Confidence Limit Upper Confidence Limit

3

(Saturday)

BUSNODEMBUSNODEMCOASTCOAST

Page 6: ERCOT Load Research Sample to Profile Comparison July 24, 2006 BUSNODEMCOAST Reflecting Prospective 2006 AV Profile ID Changes

6

Profile and Sample ComparisonProfile and Sample Comparison

4 Day of 75th percentile total absolute kWh difference for 01/01/05 thru 12/31/05

Comparison for 05/09/05

0.0

0.1

0.2

0.3

0.4

0.5

0.6

0.7

0.8

Interval

kW

h

Sample Profile Lower Confidence Limit Upper Confidence Limit

4

(Monday)

BUSNODEMBUSNODEMCOASTCOAST

Page 7: ERCOT Load Research Sample to Profile Comparison July 24, 2006 BUSNODEMCOAST Reflecting Prospective 2006 AV Profile ID Changes

7

Profile and Sample ComparisonProfile and Sample Comparison

5 Day of highest total absolute kWh difference for 01/01/05 thru 12/31/05

Comparison for 09/23/05

0.0

0.1

0.2

0.3

0.4

0.5

0.6

0.7

0.8

Interval

kW

h

Sample Profile Lower Confidence Limit Upper Confidence Limit

5

(Friday)

BUSNODEMBUSNODEMCOASTCOAST

Page 8: ERCOT Load Research Sample to Profile Comparison July 24, 2006 BUSNODEMCOAST Reflecting Prospective 2006 AV Profile ID Changes

8

Profile and Sample Comparison: Scaled Profile and Sample Comparison: Scaled LRSLRS

5 Day of highest total absolute kWh difference for 01/01/05 thru 12/31/05

Comparison for 09/23/05

0.0

0.1

0.2

0.3

0.4

0.5

0.6

0.7

0.8

Interval

kW

h

Scaled Sample Profile Lower Confidence Limit Upper Confidence Limit

5

(Friday)

BUSNODEMBUSNODEMCOASTCOAST

Page 9: ERCOT Load Research Sample to Profile Comparison July 24, 2006 BUSNODEMCOAST Reflecting Prospective 2006 AV Profile ID Changes

9

Profile and Sample ComparisonProfile and Sample Comparison

Monthly kWh

0

200

400

600

800

1,000

1,200

Jan '05 Feb '05 Mar '05 Apr '05 May '05 Jun '05 Jul '05 Aug '05 Sep '05 Oct '05 Nov '05 Dec '05

kW

h

Profile Sample

BUSNODEMBUSNODEMCOASTCOAST

Page 10: ERCOT Load Research Sample to Profile Comparison July 24, 2006 BUSNODEMCOAST Reflecting Prospective 2006 AV Profile ID Changes

10

Profile and Sample DifferencesProfile and Sample Differences

Distribution of Absolute kWh Differences

0

1,000

2,000

3,000

4,000

5,000

6,000

7,000

8,000

9,000

kWh Range

Inte

rva

l Co

un

t

BUSNODEMBUSNODEMCOASTCOAST

Page 11: ERCOT Load Research Sample to Profile Comparison July 24, 2006 BUSNODEMCOAST Reflecting Prospective 2006 AV Profile ID Changes

11

Profile and Sample DifferencesProfile and Sample Differences

Statistically Significant Differences

0

10

20

30

40

50

60

70

80

90

100

<= 0.06 0.07 - 0.08 0.09 - 0.10 0.11 - 0.12 0.13 - 0.14 0.15 - 0.16 0.17 - 0.18 0.19 - 0.20 > 0.20

Sample kWh Range

Pe

rce

nt

Unscaled Sample Scaled Sample

BUSNODEMBUSNODEMCOASTCOAST

Page 12: ERCOT Load Research Sample to Profile Comparison July 24, 2006 BUSNODEMCOAST Reflecting Prospective 2006 AV Profile ID Changes

12

Profile and Sample DifferencesProfile and Sample Differences

Statistically Significant Differences

0

10

20

30

40

50

60

70

80

90

100

Pe

rce

nt

Unscaled Sample Scaled Sample

BUSNODEMBUSNODEMCOASTCOAST

Page 13: ERCOT Load Research Sample to Profile Comparison July 24, 2006 BUSNODEMCOAST Reflecting Prospective 2006 AV Profile ID Changes

13

Profile and Sample DifferencesProfile and Sample Differences

Median Differences -- Scaled Sample minus Profilefor 01/01/05 thru 12/31/05

-0.4

-0.3

-0.2

-0.1

0.0

0.1

0.2

0.3

0.4

kWh

Median 5th Percentile 95th Percentile

Sun Mon Tue Wed Thu Fri Sat Hol

BUSNODEMBUSNODEMCOASTCOAST

Page 14: ERCOT Load Research Sample to Profile Comparison July 24, 2006 BUSNODEMCOAST Reflecting Prospective 2006 AV Profile ID Changes

14

Differences for 1Differences for 1stst Quarter 2005 Quarter 2005

Median Differences -- Scaled Sample minus Profile

-0.4

-0.3

-0.2

-0.1

0.0

0.1

0.2

0.3

0.4

kW

h

Median 5th Percentile 95th Percentile

Sun Mon Tue Wed Thu Fri Sat Hol

BUSNODEMBUSNODEMCOASTCOAST

Page 15: ERCOT Load Research Sample to Profile Comparison July 24, 2006 BUSNODEMCOAST Reflecting Prospective 2006 AV Profile ID Changes

15

Differences for 2Differences for 2ndnd Quarter 2005 Quarter 2005

Median Differences -- Scaled Sample minus Profile

-0.4

-0.3

-0.2

-0.1

0.0

0.1

0.2

0.3

0.4

kW

h

Median 5th Percentile 95th Percentile

Sun Mon Tue Wed Thu Fri Sat Hol

BUSNODEMBUSNODEMCOASTCOAST

Page 16: ERCOT Load Research Sample to Profile Comparison July 24, 2006 BUSNODEMCOAST Reflecting Prospective 2006 AV Profile ID Changes

16

Differences for 3Differences for 3rdrd Quarter 2005 Quarter 2005

Median Differences -- Scaled Sample minus Profile

-0.4

-0.3

-0.2

-0.1

0.0

0.1

0.2

0.3

0.4

kW

h

Median 5th Percentile 95th Percentile

Sun Mon Tue Wed Thu Fri Sat Hol

BUSNODEMBUSNODEMCOASTCOAST

Page 17: ERCOT Load Research Sample to Profile Comparison July 24, 2006 BUSNODEMCOAST Reflecting Prospective 2006 AV Profile ID Changes

17

Differences for 4Differences for 4thth Quarter 2005 Quarter 2005

Median Differences -- Scaled Sample minus Profile

-0.4

-0.3

-0.2

-0.1

0.0

0.1

0.2

0.3

0.4

kW

h

Median 5th Percentile 95th Percentile

Sun Mon Tue Wed Thu Fri Sat Hol

BUSNODEMBUSNODEMCOASTCOAST

Page 18: ERCOT Load Research Sample to Profile Comparison July 24, 2006 BUSNODEMCOAST Reflecting Prospective 2006 AV Profile ID Changes

18

Profile and Unscaled Sample DifferencesProfile and Unscaled Sample Differences

(Unscaled Sample minus Profile) vs. Profile for 01/01/05 thru 12/31/05

-250

-200

-150

-100

-50

0

50

0.0 0.1 0.2 0.3 0.4 0.5

Profile Interval kWh

Pe

rce

nt

Dif

fere

nc

e

Median 5th Percentile 95th Percentile Regression on Profile kWh

BUSNODEMBUSNODEMCOASTCOAST

Page 19: ERCOT Load Research Sample to Profile Comparison July 24, 2006 BUSNODEMCOAST Reflecting Prospective 2006 AV Profile ID Changes

19

Profile and Scaled Sample DifferencesProfile and Scaled Sample Differences

(Scaled Sample minus Profile) vs. Profile for 01/01/05 thru 12/31/05

-120

-100

-80

-60

-40

-20

0

20

40

60

80

100

0.0 0.1 0.2 0.3 0.4 0.5

Profile Interval kWh

Pe

rce

nt

Dif

fere

nc

e

Median 5th Percentile 95th Percentile Regression on Profile kWh

BUSNODEMBUSNODEMCOASTCOAST

Page 20: ERCOT Load Research Sample to Profile Comparison July 24, 2006 BUSNODEMCOAST Reflecting Prospective 2006 AV Profile ID Changes

20

Profile and Sample DifferencesProfile and Sample Differences

Distribution of kWh Percent Differences[(sample - profile) / sample]

0

2,000

4,000

6,000

8,000

10,000

12,000

14,000

16,000

18,000

20,000

Percent Difference

Inte

rva

l Co

un

t

Unscaled Sample Scaled Sample

BUSNODEMBUSNODEMCOASTCOAST

Page 21: ERCOT Load Research Sample to Profile Comparison July 24, 2006 BUSNODEMCOAST Reflecting Prospective 2006 AV Profile ID Changes

21

Profile and Sample DifferencesProfile and Sample Differences

J an '05 60.8% 74.4%Feb '05 57.1% 71.0%Mar '05 62.2% 70.6%Apr '05 57.0% 72.1%

May '05 64.4% 71.4%J un '05 64.0% 79.5%J ul '05 61.5% 79.7%

Aug '05 59.1% 78.5%Sep '05 56.7% 77.1%Oct '05 51.9% 69.5%

Nov '05 54.3% 72.0%Dec '05 61.9% 67.3%

Year 48.7% 66.1%

ProfileLRSLoad Factor

BUSNODEMBUSNODEMCOASTCOAST

Page 22: ERCOT Load Research Sample to Profile Comparison July 24, 2006 BUSNODEMCOAST Reflecting Prospective 2006 AV Profile ID Changes

22

Profile and Sample DifferencesProfile and Sample Differences

J an '05 265 280 532 517 49.7% 54.3%Feb '05 234 242 472 464 49.7% 52.1%Mar '05 277 297 479 458 57.9% 64.9%Apr '05 239 253 508 494 47.0% 51.2%

May '05 285 288 544 541 52.3% 53.3%J un '05 395 384 567 579 69.7% 66.3%J ul '05 335 321 661 675 50.6% 47.6%

Aug '05 429 412 599 616 71.7% 66.9%Sep '05 372 352 604 624 61.5% 56.4%Oct '05 318 296 510 532 62.3% 55.7%

Nov '05 282 279 485 488 58.1% 57.3%Dec '05 272 263 529 539 51.4% 48.7%

Year 3,702 3,668 6,491 6,526 57.0% 56.2%

Note: On-Peak is 7 a.m. to 10 p.m., non-holiday weekdays.

On-Peak and Off-Peak kWh

Profile LRS ProfileLRS Profile LRS

On-Peak / Off-PeakOn-Peak kWh Off-Peak kWh

BUSNODEMBUSNODEMCOASTCOAST

Page 23: ERCOT Load Research Sample to Profile Comparison July 24, 2006 BUSNODEMCOAST Reflecting Prospective 2006 AV Profile ID Changes

23

Profile and Sample DifferencesProfile and Sample Differences

LRS ProfileJ an '05 8.3% 7.8%Feb '05 7.3% 6.9%Mar '05 7.6% 7.4%Apr '05 7.3% 7.3%

May '05 8.0% 8.1%J un '05 9.2% 9.4%J ul '05 9.4% 9.8%

Aug '05 9.8% 10.1%Sep '05 9.1% 9.6%Oct '05 8.1% 8.1%

Nov '05 7.8% 7.5%Dec '05 8.2% 7.9%

Monthly kWh as a Percentage of the Year

BUSNODEMBUSNODEMCOASTCOAST

Page 24: ERCOT Load Research Sample to Profile Comparison July 24, 2006 BUSNODEMCOAST Reflecting Prospective 2006 AV Profile ID Changes

24

Profile and Sample DifferencesProfile and Sample Differences

Day of Week Absolute Diff Absolute % Diff RMSESun 0.012 0.034 14.2% 0.002Mon -0.011 0.033 12.1% 0.002Tue 0.003 0.038 12.4% 0.002Wed -0.003 0.037 12.6% 0.002Thu -0.003 0.038 12.8% 0.002Fri -0.004 0.038 13.3% 0.002Sat 0.007 0.031 13.1% 0.002

Holiday -0.011 0.029 14.4% 0.001

Month & Year Absolute Diff Absolute % Diff RMSEJ an '05 -2.91E-15 0.029 12.0% 0.001Feb '05 -2.40E-15 0.030 12.3% 0.001Mar '05 -2.56E-15 0.026 11.4% 0.001Apr '05 -4.32E-15 0.024 10.4% 0.001

May '05 -7.62E-16 0.030 12.0% 0.001J un '05 2.21E-15 0.038 11.6% 0.002J ul '05 1.52E-15 0.042 12.9% 0.003

Aug '05 1.05E-15 0.043 12.6% 0.003Sep '05 1.20E-15 0.051 18.0% 0.005Oct '05 -2.63E-15 0.045 16.5% 0.003

Nov '05 -4.73E-15 0.028 11.3% 0.001Dec '05 -3.70E-15 0.037 14.7% 0.002

Year -1.50E-15 0.035 13.0% 0.002

Net Difference

Net Difference

Mean Scaled kWh Differences BUSNODEMBUSNODEMCOASTCOAST

Page 25: ERCOT Load Research Sample to Profile Comparison July 24, 2006 BUSNODEMCOAST Reflecting Prospective 2006 AV Profile ID Changes

25

Profile and Sample DifferencesProfile and Sample Differences

Day of WeekSun 0.001 0.002 6.3% 4.82E-06Mon -0.001 0.002 5.2% 4.08E-06Tue 0.000 0.002 4.7% 5.32E-06Wed 0.000 0.002 4.5% 4.18E-06Thu 0.000 0.002 4.6% 4.89E-06Fri 0.000 0.002 5.0% 5.77E-06Sat 0.001 0.002 7.0% 7.72E-06

Holiday -0.001 0.002 8.5% 8.45E-06

Month & YearJ an '05 -4.21E-16 0.002 7.5% 6.96E-06Feb '05 -2.45E-16 0.003 7.3% 1.09E-05Mar '05 -3.50E-16 0.001 4.2% 2.49E-06Apr '05 -3.96E-16 0.001 4.0% 2.69E-06

May '05 -9.92E-17 0.002 5.0% 3.74E-06J un '05 3.17E-16 0.001 2.8% 1.15E-06J ul '05 1.82E-16 0.001 4.4% 3.08E-06

Aug '05 1.49E-16 0.001 3.3% 1.61E-06Sep '05 2.02E-17 0.003 10.7% 1.88E-05Oct '05 -2.46E-16 0.002 4.9% 4.16E-06

Nov '05 -6.64E-16 0.001 3.4% 1.68E-06Dec '05 -4.70E-16 0.002 7.5% 7.58E-06

Year -1.85E-16 0.002 5.4% 5.35E-06

Fraction Difference

Fraction Difference

Average Daily Fraction DifferencesAbs. Fraction Diff Abs. % Fraction Diff RMSE

Abs. Fraction Diff Abs. % Fraction Diff RMSE

BUSNODEMBUSNODEMCOASTCOAST

Page 26: ERCOT Load Research Sample to Profile Comparison July 24, 2006 BUSNODEMCOAST Reflecting Prospective 2006 AV Profile ID Changes

ERCOTERCOTLoad Research Sample to Load Research Sample to Profile Comparison Profile Comparison

July 24, 2006

BUSNODEMBUSNODEMEASTEAST

Reflecting Prospective 2006 Reflecting Prospective 2006 AV Profile ID ChangesAV Profile ID Changes

Page 27: ERCOT Load Research Sample to Profile Comparison July 24, 2006 BUSNODEMCOAST Reflecting Prospective 2006 AV Profile ID Changes

27

Distribution of Sample PrecisionDistribution of Sample Precision

90% Confidence

0

1,000

2,000

3,000

4,000

5,000

6,000

7,000

Percent Accuracy

Inte

rva

l Co

un

t

BUSNODEMBUSNODEMEASTEAST

Page 28: ERCOT Load Research Sample to Profile Comparison July 24, 2006 BUSNODEMCOAST Reflecting Prospective 2006 AV Profile ID Changes

28

Profile and Sample ComparisonProfile and Sample Comparison

1 Day of lowest total absolute kWh difference for 01/01/05 thru 12/31/05

Comparison for 05/01/05

0.0

0.1

0.2

0.3

0.4

0.5

0.6

0.7

0.8

Interval

kW

h

Sample Profile Lower Confidence Limit Upper Confidence Limit

1

(Sunday)

BUSNODEMBUSNODEMEASTEAST

Page 29: ERCOT Load Research Sample to Profile Comparison July 24, 2006 BUSNODEMCOAST Reflecting Prospective 2006 AV Profile ID Changes

29

Profile and Sample ComparisonProfile and Sample Comparison

2 Day of 25th percentile total absolute kWh difference for 01/01/05 thru 12/31/05

Comparison for 03/30/05

0.0

0.1

0.2

0.3

0.4

0.5

0.6

0.7

0.8

Interval

kW

h

Sample Profile Lower Confidence Limit Upper Confidence Limit

2

(Wednesday)

BUSNODEMBUSNODEMEASTEAST

Page 30: ERCOT Load Research Sample to Profile Comparison July 24, 2006 BUSNODEMCOAST Reflecting Prospective 2006 AV Profile ID Changes

30

Profile and Sample ComparisonProfile and Sample Comparison

3 Day of median total absolute kWh difference for 01/01/05 thru 12/31/05

Comparison for 10/28/05

0.0

0.1

0.2

0.3

0.4

0.5

0.6

0.7

0.8

Interval

kW

h

Sample Profile Lower Confidence Limit Upper Confidence Limit

3

(Friday)

BUSNODEMBUSNODEMEASTEAST

Page 31: ERCOT Load Research Sample to Profile Comparison July 24, 2006 BUSNODEMCOAST Reflecting Prospective 2006 AV Profile ID Changes

31

Profile and Sample ComparisonProfile and Sample Comparison

4 Day of 75th percentile total absolute kWh difference for 01/01/05 thru 12/31/05

Comparison for 10/14/05

0.0

0.1

0.2

0.3

0.4

0.5

0.6

0.7

0.8

Interval

kW

h

Sample Profile Lower Confidence Limit Upper Confidence Limit

4

(Friday)

BUSNODEMBUSNODEMEASTEAST

Page 32: ERCOT Load Research Sample to Profile Comparison July 24, 2006 BUSNODEMCOAST Reflecting Prospective 2006 AV Profile ID Changes

32

Profile and Sample ComparisonProfile and Sample Comparison

5 Day of highest total absolute kWh difference for 01/01/05 thru 12/31/05

Comparison for 09/26/05

0.0

0.1

0.2

0.3

0.4

0.5

0.6

0.7

0.8

Interval

kW

h

Sample Profile Lower Confidence Limit Upper Confidence Limit

5

(Monday)

BUSNODEMBUSNODEMEASTEAST

Page 33: ERCOT Load Research Sample to Profile Comparison July 24, 2006 BUSNODEMCOAST Reflecting Prospective 2006 AV Profile ID Changes

33

Profile and Sample Comparison: Scaled Profile and Sample Comparison: Scaled LRSLRS

5 Day of highest total absolute kWh difference for 01/01/05 thru 12/31/05

Comparison for 09/26/05

0.0

0.1

0.2

0.3

0.4

0.5

0.6

0.7

0.8

Interval

kW

h

Scaled Sample Profile Lower Confidence Limit Upper Confidence Limit

5

(Monday)

BUSNODEMBUSNODEMEASTEAST

Page 34: ERCOT Load Research Sample to Profile Comparison July 24, 2006 BUSNODEMCOAST Reflecting Prospective 2006 AV Profile ID Changes

34

Profile and Sample ComparisonProfile and Sample Comparison

Monthly kWh

0

200

400

600

800

1,000

1,200

Jan '05 Feb '05 Mar '05 Apr '05 May '05 Jun '05 Jul '05 Aug '05 Sep '05 Oct '05 Nov '05 Dec '05

kW

h

Profile Sample

BUSNODEMBUSNODEMEASTEAST

Page 35: ERCOT Load Research Sample to Profile Comparison July 24, 2006 BUSNODEMCOAST Reflecting Prospective 2006 AV Profile ID Changes

35

Profile and Sample DifferencesProfile and Sample Differences

Distribution of Absolute kWh Differences

0

1,000

2,000

3,000

4,000

5,000

6,000

7,000

8,000

kWh Range

Inte

rva

l Co

un

t

BUSNODEMBUSNODEMEASTEAST

Page 36: ERCOT Load Research Sample to Profile Comparison July 24, 2006 BUSNODEMCOAST Reflecting Prospective 2006 AV Profile ID Changes

36

Profile and Sample DifferencesProfile and Sample Differences

Statistically Significant Differences

0

10

20

30

40

50

60

70

80

90

100

<= 0.06 0.07 - 0.08 0.09 - 0.10 0.11 - 0.12 0.13 - 0.14 0.15 - 0.16 0.17 - 0.18 0.19 - 0.20 > 0.20

Sample kWh Range

Pe

rce

nt

Unscaled Sample Scaled Sample

BUSNODEMBUSNODEMEASTEAST

Page 37: ERCOT Load Research Sample to Profile Comparison July 24, 2006 BUSNODEMCOAST Reflecting Prospective 2006 AV Profile ID Changes

37

Profile and Sample DifferencesProfile and Sample Differences

Statistically Significant Differences

0

10

20

30

40

50

60

70

80

90

100

Pe

rce

nt

Unscaled Sample Scaled Sample

BUSNODEMBUSNODEMEASTEAST

Page 38: ERCOT Load Research Sample to Profile Comparison July 24, 2006 BUSNODEMCOAST Reflecting Prospective 2006 AV Profile ID Changes

38

Profile and Sample DifferencesProfile and Sample Differences

Median Differences -- Scaled Sample minus Profilefor 01/01/05 thru 12/31/05

-0.4

-0.3

-0.2

-0.1

0.0

0.1

0.2

0.3

0.4

kWh

Median 5th Percentile 95th Percentile

Sun Mon Tue Wed Thu Fri Sat Hol

BUSNODEMBUSNODEMEASTEAST

Page 39: ERCOT Load Research Sample to Profile Comparison July 24, 2006 BUSNODEMCOAST Reflecting Prospective 2006 AV Profile ID Changes

39

Differences for 1Differences for 1stst Quarter 2005 Quarter 2005

Median Differences -- Scaled Sample minus Profile

-0.4

-0.3

-0.2

-0.1

0.0

0.1

0.2

0.3

0.4

kW

h

Median 5th Percentile 95th Percentile

Sun Mon Tue Wed Thu Fri Sat Hol

BUSNODEMBUSNODEMEASTEAST

Page 40: ERCOT Load Research Sample to Profile Comparison July 24, 2006 BUSNODEMCOAST Reflecting Prospective 2006 AV Profile ID Changes

40

Differences for 2Differences for 2ndnd Quarter 2005 Quarter 2005

Median Differences -- Scaled Sample minus Profile

-0.4

-0.3

-0.2

-0.1

0.0

0.1

0.2

0.3

0.4

kW

h

Median 5th Percentile 95th Percentile

Sun Mon Tue Wed Thu Fri Sat Hol

BUSNODEMBUSNODEMEASTEAST

Page 41: ERCOT Load Research Sample to Profile Comparison July 24, 2006 BUSNODEMCOAST Reflecting Prospective 2006 AV Profile ID Changes

41

Differences for 3Differences for 3rdrd Quarter 2005 Quarter 2005

Median Differences -- Scaled Sample minus Profile

-0.4

-0.3

-0.2

-0.1

0.0

0.1

0.2

0.3

0.4

kW

h

Median 5th Percentile 95th Percentile

Sun Mon Tue Wed Thu Fri Sat Hol

BUSNODEMBUSNODEMEASTEAST

Page 42: ERCOT Load Research Sample to Profile Comparison July 24, 2006 BUSNODEMCOAST Reflecting Prospective 2006 AV Profile ID Changes

42

Differences for 4Differences for 4thth Quarter 2005 Quarter 2005

Median Differences -- Scaled Sample minus Profile

-0.4

-0.3

-0.2

-0.1

0.0

0.1

0.2

0.3

0.4

kW

h

Median 5th Percentile 95th Percentile

Sun Mon Tue Wed Thu Fri Sat Hol

BUSNODEMBUSNODEMEASTEAST

Page 43: ERCOT Load Research Sample to Profile Comparison July 24, 2006 BUSNODEMCOAST Reflecting Prospective 2006 AV Profile ID Changes

43

Profile and Unscaled Sample DifferencesProfile and Unscaled Sample Differences

(Unscaled Sample minus Profile) vs. Profile for 01/01/05 thru 12/31/05

-160

-140

-120

-100

-80

-60

-40

-20

0

0.0 0.1 0.2 0.3 0.4 0.5 0.6

Profile Interval kWh

Pe

rce

nt

Dif

fere

nc

e

Median 5th Percentile 95th Percentile Regression on Profile kWh

BUSNODEMBUSNODEMEASTEAST

Page 44: ERCOT Load Research Sample to Profile Comparison July 24, 2006 BUSNODEMCOAST Reflecting Prospective 2006 AV Profile ID Changes

44

Profile and Scaled Sample DifferencesProfile and Scaled Sample Differences

(Scaled Sample minus Profile) vs. Profile for 01/01/05 thru 12/31/05

-120

-100

-80

-60

-40

-20

0

20

40

60

80

100

0.0 0.1 0.2 0.3 0.4 0.5 0.6

Profile Interval kWh

Pe

rce

nt

Dif

fere

nc

e

Median 5th Percentile 95th Percentile Regression on Profile kWh

BUSNODEMBUSNODEMEASTEAST

Page 45: ERCOT Load Research Sample to Profile Comparison July 24, 2006 BUSNODEMCOAST Reflecting Prospective 2006 AV Profile ID Changes

45

Profile and Sample DifferencesProfile and Sample Differences

Distribution of kWh Percent Differences[(sample - profile) / sample]

0

5,000

10,000

15,000

20,000

25,000

Percent Difference

Inte

rva

l Co

un

t

Unscaled Sample Scaled Sample

BUSNODEMBUSNODEMEASTEAST

Page 46: ERCOT Load Research Sample to Profile Comparison July 24, 2006 BUSNODEMCOAST Reflecting Prospective 2006 AV Profile ID Changes

46

Profile and Sample DifferencesProfile and Sample Differences

J an '05 56.9% 70.8%Feb '05 57.8% 71.1%Mar '05 65.8% 69.3%Apr '05 60.2% 64.3%

May '05 52.1% 63.2%J un '05 58.1% 63.1%J ul '05 62.3% 67.1%

Aug '05 62.9% 65.6%Sep '05 64.4% 62.5%Oct '05 61.6% 64.4%

Nov '05 45.7% 69.2%Dec '05 60.6% 66.1%

Year 46.8% 53.4%

ProfileLRSLoad Factor

BUSNODEMBUSNODEMEASTEAST

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47

Profile and Sample DifferencesProfile and Sample Differences

J an '05 285 303 515 498 55.4% 60.8%Feb '05 242 256 446 432 54.2% 59.2%Mar '05 290 311 431 410 67.3% 75.8%Apr '05 242 258 442 426 54.8% 60.5%

May '05 300 304 471 468 63.7% 64.9%J un '05 388 406 521 503 74.5% 80.6%J ul '05 332 340 607 599 54.7% 56.7%

Aug '05 423 434 553 542 76.6% 79.9%Sep '05 362 380 574 555 63.0% 68.4%Oct '05 286 311 480 456 59.5% 68.1%

Nov '05 272 297 465 440 58.5% 67.4%Dec '05 261 289 546 518 47.9% 55.7%

Year 3,684 3,887 6,052 5,849 60.9% 66.4%

Note: On-Peak is 7 a.m. to 10 p.m., non-holiday weekdays.

On-Peak and Off-Peak kWh

Profile LRS ProfileLRS Profile LRS

On-Peak / Off-PeakOn-Peak kWh Off-Peak kWh

BUSNODEMBUSNODEMEASTEAST

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48

Profile and Sample DifferencesProfile and Sample Differences

LRS ProfileJ an '05 8.2% 8.2%Feb '05 7.1% 7.1%Mar '05 7.3% 7.4%Apr '05 6.9% 7.0%

May '05 7.7% 7.9%J un '05 9.9% 9.3%J ul '05 10.0% 9.6%

Aug '05 10.3% 10.0%Sep '05 9.4% 9.6%Oct '05 7.8% 7.9%

Nov '05 7.1% 7.6%Dec '05 8.3% 8.3%

Monthly kWh as a Percentage of the Year

BUSNODEMBUSNODEMEASTEAST

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49

Profile and Sample DifferencesProfile and Sample Differences

Day of Week Absolute Diff Absolute % Diff RMSESun 0.013 0.029 11.8% 0.001Mon -0.003 0.031 11.0% 0.002Tue -0.007 0.030 10.7% 0.001Wed -0.003 0.032 11.4% 0.002Thu -0.005 0.032 11.4% 0.002Fri -0.003 0.031 11.1% 0.002Sat 0.005 0.029 11.8% 0.001

Holiday 0.013 0.031 12.2% 0.002

Month & Year Absolute Diff Absolute % Diff RMSEJ an '05 -1.51E-15 0.034 12.7% 0.002Feb '05 -1.52E-15 0.032 13.1% 0.002Mar '05 -4.91E-17 0.029 12.1% 0.001Apr '05 1.19E-15 0.025 10.7% 0.001

May '05 1.86E-15 0.023 9.3% 0.001J un '05 1.82E-15 0.033 10.2% 0.002J ul '05 -1.44E-15 0.027 8.7% 0.001

Aug '05 1.01E-15 0.027 8.4% 0.001Sep '05 -6.70E-16 0.037 13.2% 0.002Oct '05 -4.18E-16 0.032 12.4% 0.002

Nov '05 -6.74E-16 0.030 11.7% 0.001Dec '05 -1.53E-15 0.036 13.6% 0.002

Year -1.57E-16 0.030 11.3% 0.001

Net Difference

Net Difference

Mean Scaled kWh Differences BUSNODEMBUSNODEMEASTEAST

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50

Profile and Sample DifferencesProfile and Sample Differences

Day of WeekSun 0.002 0.002 7.4% 9.23E-06Mon 0.000 0.002 4.9% 4.29E-06Tue -0.001 0.001 4.5% 3.36E-06Wed 0.000 0.002 5.0% 4.30E-06Thu -0.001 0.002 4.9% 4.44E-06Fri 0.000 0.001 4.0% 3.18E-06Sat 0.001 0.002 6.0% 6.23E-06

Holiday 0.002 0.002 7.1% 6.65E-06

Month & YearJ an '05 -1.32E-16 0.002 5.1% 4.63E-06Feb '05 -3.25E-17 0.002 5.0% 4.71E-06Mar '05 -4.32E-17 0.001 4.5% 3.11E-06Apr '05 2.64E-16 0.002 6.1% 6.85E-06

May '05 2.57E-16 0.001 4.5% 3.74E-06J un '05 1.30E-16 0.002 6.4% 7.72E-06J ul '05 -6.44E-17 0.001 4.2% 2.70E-06

Aug '05 -7.36E-17 0.001 2.9% 1.66E-06Sep '05 -7.19E-17 0.002 6.4% 7.27E-06Oct '05 -1.36E-16 0.002 6.9% 7.40E-06

Nov '05 -1.71E-16 0.002 5.5% 5.08E-06Dec '05 -2.16E-16 0.002 6.0% 5.87E-06

Year -2.47E-17 0.002 5.3% 5.05E-06

Fraction Difference

Fraction Difference

Average Daily Fraction DifferencesAbs. Fraction Diff Abs. % Fraction Diff RMSE

Abs. Fraction Diff Abs. % Fraction Diff RMSE

BUSNODEMBUSNODEMEASTEAST

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ERCOTERCOTLoad Research Sample to Load Research Sample to Profile Comparison Profile Comparison

July 24, 2006

BUSNODEMBUSNODEMFWESTFWEST

Reflecting Prospective 2006 Reflecting Prospective 2006 AV Profile ID ChangesAV Profile ID Changes

Page 52: ERCOT Load Research Sample to Profile Comparison July 24, 2006 BUSNODEMCOAST Reflecting Prospective 2006 AV Profile ID Changes

52

Distribution of Sample PrecisionDistribution of Sample Precision

90% Confidence

0

1,000

2,000

3,000

4,000

5,000

6,000

7,000

8,000

Percent Accuracy

Inte

rva

l Co

un

t

BUSNODEMBUSNODEMFWESTFWEST

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53

Profile and Sample ComparisonProfile and Sample Comparison

1 Day of lowest total absolute kWh difference for 01/01/05 thru 12/31/05

Comparison for 05/15/05

0.0

0.1

0.2

0.3

0.4

0.5

0.6

0.7

0.8

Interval

kW

h

Sample Profile Lower Confidence Limit Upper Confidence Limit

1

(Sunday)

BUSNODEMBUSNODEMFWESTFWEST

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54

Profile and Sample ComparisonProfile and Sample Comparison

2 Day of 25th percentile total absolute kWh difference for 01/01/05 thru 12/31/05

Comparison for 04/11/05

0.0

0.1

0.2

0.3

0.4

0.5

0.6

0.7

0.8

Interval

kW

h

Sample Profile Lower Confidence Limit Upper Confidence Limit

2

(Monday)

BUSNODEMBUSNODEMFWESTFWEST

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55

Profile and Sample ComparisonProfile and Sample Comparison

3 Day of median total absolute kWh difference for 01/01/05 thru 12/31/05

Comparison for 11/04/05

0.0

0.1

0.2

0.3

0.4

0.5

0.6

0.7

0.8

Interval

kW

h

Sample Profile Lower Confidence Limit Upper Confidence Limit

3

(Friday)

BUSNODEMBUSNODEMFWESTFWEST

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56

Profile and Sample ComparisonProfile and Sample Comparison

4 Day of 75th percentile total absolute kWh difference for 01/01/05 thru 12/31/05

Comparison for 12/16/05

0.0

0.1

0.2

0.3

0.4

0.5

0.6

0.7

0.8

Interval

kW

h

Sample Profile Lower Confidence Limit Upper Confidence Limit

4

(Friday)

BUSNODEMBUSNODEMFWESTFWEST

Page 57: ERCOT Load Research Sample to Profile Comparison July 24, 2006 BUSNODEMCOAST Reflecting Prospective 2006 AV Profile ID Changes

57

Profile and Sample ComparisonProfile and Sample Comparison

5 Day of highest total absolute kWh difference for 01/01/05 thru 12/31/05

Comparison for 12/08/05

0.0

0.1

0.2

0.3

0.4

0.5

0.6

0.7

0.8

Interval

kW

h

Sample Profile Lower Confidence Limit Upper Confidence Limit

5

(Thursday)

BUSNODEMBUSNODEMFWESTFWEST

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58

Profile and Sample Comparison: Scaled Profile and Sample Comparison: Scaled LRSLRS

5 Day of highest total absolute kWh difference for 01/01/05 thru 12/31/05

Comparison for 12/08/05

0.0

0.1

0.2

0.3

0.4

0.5

0.6

0.7

0.8

Interval

kW

h

Scaled Sample Profile Lower Confidence Limit Upper Confidence Limit

5

(Thursday)

BUSNODEMBUSNODEMFWESTFWEST

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59

Profile and Sample ComparisonProfile and Sample Comparison

Monthly kWh

0

200

400

600

800

1,000

1,200

Jan '05 Feb '05 Mar '05 Apr '05 May '05 Jun '05 Jul '05 Aug '05 Sep '05 Oct '05 Nov '05 Dec '05

kW

h

Profile Sample

BUSNODEMBUSNODEMFWESTFWEST

Page 60: ERCOT Load Research Sample to Profile Comparison July 24, 2006 BUSNODEMCOAST Reflecting Prospective 2006 AV Profile ID Changes

60

Profile and Sample DifferencesProfile and Sample Differences

Distribution of Absolute kWh Differences

0

1,000

2,000

3,000

4,000

5,000

6,000

7,000

kWh Range

Inte

rva

l Co

un

t

BUSNODEMBUSNODEMFWESTFWEST

Page 61: ERCOT Load Research Sample to Profile Comparison July 24, 2006 BUSNODEMCOAST Reflecting Prospective 2006 AV Profile ID Changes

61

Profile and Sample DifferencesProfile and Sample Differences

Statistically Significant Differences

0

10

20

30

40

50

60

70

80

90

100

<= 0.06 0.07 - 0.08 0.09 - 0.10 0.11 - 0.12 0.13 - 0.14 0.15 - 0.16 0.17 - 0.18 0.19 - 0.20 > 0.20

Sample kWh Range

Pe

rce

nt

Unscaled Sample Scaled Sample

BUSNODEMBUSNODEMFWESTFWEST

Page 62: ERCOT Load Research Sample to Profile Comparison July 24, 2006 BUSNODEMCOAST Reflecting Prospective 2006 AV Profile ID Changes

62

Profile and Sample DifferencesProfile and Sample Differences

Statistically Significant Differences

0

10

20

30

40

50

60

70

80

90

100

Pe

rce

nt

Unscaled Sample Scaled Sample

BUSNODEMBUSNODEMFWESTFWEST

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63

Profile and Sample DifferencesProfile and Sample Differences

Median Differences -- Scaled Sample minus Profilefor 01/01/05 thru 12/31/05

-0.4

-0.3

-0.2

-0.1

0.0

0.1

0.2

0.3

0.4

kWh

Median 5th Percentile 95th Percentile

Sun Mon Tue Wed Thu Fri Sat Hol

BUSNODEMBUSNODEMFWESTFWEST

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64

Differences for 1Differences for 1stst Quarter 2005 Quarter 2005

Median Differences -- Scaled Sample minus Profile

-0.4

-0.3

-0.2

-0.1

0.0

0.1

0.2

0.3

0.4

kW

h

Median 5th Percentile 95th Percentile

Sun Mon Tue Wed Thu Fri Sat Hol

BUSNODEMBUSNODEMFWESTFWEST

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65

Differences for 2Differences for 2ndnd Quarter 2005 Quarter 2005

Median Differences -- Scaled Sample minus Profile

-0.4

-0.3

-0.2

-0.1

0.0

0.1

0.2

0.3

0.4

kW

h

Median 5th Percentile 95th Percentile

Sun Mon Tue Wed Thu Fri Sat Hol

BUSNODEMBUSNODEMFWESTFWEST

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66

Differences for 3Differences for 3rdrd Quarter 2005 Quarter 2005

Median Differences -- Scaled Sample minus Profile

-0.4

-0.3

-0.2

-0.1

0.0

0.1

0.2

0.3

0.4

kW

h

Median 5th Percentile 95th Percentile

Sun Mon Tue Wed Thu Fri Sat Hol

BUSNODEMBUSNODEMFWESTFWEST

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67

Differences for 4Differences for 4thth Quarter 2005 Quarter 2005

Median Differences -- Scaled Sample minus Profile

-0.4

-0.3

-0.2

-0.1

0.0

0.1

0.2

0.3

0.4

kW

h

Median 5th Percentile 95th Percentile

Sun Mon Tue Wed Thu Fri Sat Hol

BUSNODEMBUSNODEMFWESTFWEST

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68

Profile and Unscaled Sample DifferencesProfile and Unscaled Sample Differences

(Unscaled Sample minus Profile) vs. Profile for 01/01/05 thru 12/31/05

-300

-250

-200

-150

-100

-50

0

50

0.0 0.1 0.2 0.3 0.4 0.5 0.6 0.7

Profile Interval kWh

Pe

rce

nt

Dif

fere

nc

e

Median 5th Percentile 95th Percentile Regression on Profile kWh

BUSNODEMBUSNODEMFWESTFWEST

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69

Profile and Scaled Sample DifferencesProfile and Scaled Sample Differences

(Scaled Sample minus Profile) vs. Profile for 01/01/05 thru 12/31/05

-120

-100

-80

-60

-40

-20

0

20

40

60

80

100

0.0 0.1 0.2 0.3 0.4 0.5 0.6 0.7

Profile Interval kWh

Pe

rce

nt

Dif

fere

nc

e

Median 5th Percentile 95th Percentile Regression on Profile kWh

BUSNODEMBUSNODEMFWESTFWEST

Page 70: ERCOT Load Research Sample to Profile Comparison July 24, 2006 BUSNODEMCOAST Reflecting Prospective 2006 AV Profile ID Changes

70

Profile and Sample DifferencesProfile and Sample Differences

Distribution of kWh Percent Differences[(sample - profile) / sample]

0

2,000

4,000

6,000

8,000

10,000

12,000

14,000

16,000

18,000

Percent Difference

Inte

rva

l Co

un

t

Unscaled Sample Scaled Sample

BUSNODEMBUSNODEMFWESTFWEST

Page 71: ERCOT Load Research Sample to Profile Comparison July 24, 2006 BUSNODEMCOAST Reflecting Prospective 2006 AV Profile ID Changes

71

Profile and Sample DifferencesProfile and Sample Differences

J an '05 60.4% 55.8%Feb '05 57.6% 56.8%Mar '05 61.1% 57.7%Apr '05 60.0% 55.1%

May '05 53.3% 50.0%J un '05 60.9% 57.7%J ul '05 61.2% 59.3%

Aug '05 63.6% 61.8%Sep '05 60.8% 56.9%Oct '05 57.1% 56.4%

Nov '05 60.1% 55.8%Dec '05 65.9% 45.6%

Year 52.5% 45.1%

ProfileLRSLoad Factor

BUSNODEMBUSNODEMFWESTFWEST

Page 72: ERCOT Load Research Sample to Profile Comparison July 24, 2006 BUSNODEMCOAST Reflecting Prospective 2006 AV Profile ID Changes

72

Profile and Sample DifferencesProfile and Sample Differences

J an '05 302 333 529 497 57.0% 67.0%Feb '05 275 295 473 453 58.1% 65.0%Mar '05 309 340 447 416 69.1% 81.7%Apr '05 256 293 458 421 55.9% 69.5%

May '05 319 345 499 473 63.9% 73.0%J un '05 412 443 551 520 74.8% 85.2%J ul '05 331 362 658 627 50.3% 57.7%

Aug '05 406 445 550 511 73.9% 87.2%Sep '05 362 394 573 541 63.1% 72.8%Oct '05 288 324 484 448 59.5% 72.3%

Nov '05 283 323 471 431 60.1% 74.9%Dec '05 305 334 563 535 54.2% 62.4%

Year 3,848 4,230 6,256 5,873 61.5% 72.0%

Note: On-Peak is 7 a.m. to 10 p.m., non-holiday weekdays.

On-Peak and Off-Peak kWh

Profile LRS ProfileLRS Profile LRS

On-Peak / Off-PeakOn-Peak kWh Off-Peak kWh

BUSNODEMBUSNODEMFWESTFWEST

Page 73: ERCOT Load Research Sample to Profile Comparison July 24, 2006 BUSNODEMCOAST Reflecting Prospective 2006 AV Profile ID Changes

73

Profile and Sample DifferencesProfile and Sample Differences

LRS ProfileJ an '05 8.3% 8.2%Feb '05 7.4% 7.4%Mar '05 7.4% 7.5%Apr '05 7.3% 7.1%

May '05 8.1% 8.1%J un '05 9.7% 9.5%J ul '05 9.7% 9.8%

Aug '05 9.3% 9.5%Sep '05 8.8% 9.3%Oct '05 7.6% 7.6%

Nov '05 7.5% 7.5%Dec '05 9.0% 8.6%

Monthly kWh as a Percentage of the Year

BUSNODEMBUSNODEMFWESTFWEST

Page 74: ERCOT Load Research Sample to Profile Comparison July 24, 2006 BUSNODEMCOAST Reflecting Prospective 2006 AV Profile ID Changes

74

Profile and Sample DifferencesProfile and Sample Differences

Day of Week Absolute Diff Absolute % Diff RMSESun 0.014 0.031 12.1% 0.001Mon -0.011 0.051 17.8% 0.004Tue -0.005 0.048 16.3% 0.003Wed -0.001 0.048 15.8% 0.003Thu 0.001 0.046 15.0% 0.003Fri -0.003 0.048 16.0% 0.003Sat 0.002 0.038 14.6% 0.002

Holiday 0.013 0.034 13.1% 0.002

Month & Year Absolute Diff Absolute % Diff RMSEJ an '05 3.05E-15 0.043 15.2% 0.003Feb '05 4.03E-15 0.039 14.0% 0.002Mar '05 7.64E-15 0.039 15.3% 0.002Apr '05 2.64E-15 0.043 17.1% 0.003

May '05 3.88E-15 0.035 12.9% 0.002J un '05 5.32E-16 0.050 15.2% 0.004J ul '05 1.60E-15 0.051 15.4% 0.004

Aug '05 4.01E-16 0.047 14.7% 0.003Sep '05 2.61E-15 0.048 15.1% 0.004Oct '05 8.24E-15 0.041 15.8% 0.002

Nov '05 5.55E-15 0.044 16.5% 0.003Dec '05 3.29E-15 0.048 16.2% 0.004

Year 3.63E-15 0.044 15.3% 0.003

Net Difference

Net Difference

Mean Scaled kWh Differences BUSNODEMBUSNODEMFWESTFWEST

Page 75: ERCOT Load Research Sample to Profile Comparison July 24, 2006 BUSNODEMCOAST Reflecting Prospective 2006 AV Profile ID Changes

75

Profile and Sample DifferencesProfile and Sample Differences

Day of WeekSun 0.002 0.002 6.4% 4.65E-06Mon -0.001 0.001 4.2% 3.08E-06Tue -0.001 0.001 3.5% 2.16E-06Wed 0.000 0.001 2.6% 1.45E-06Thu 0.000 0.001 3.4% 2.31E-06Fri 0.000 0.001 3.9% 2.64E-06Sat 0.000 0.001 2.9% 1.22E-06

Holiday 0.001 0.002 6.4% 4.46E-06

Month & YearJ an '05 3.70E-16 0.001 3.2% 1.71E-06Feb '05 4.29E-16 0.001 3.8% 2.34E-06Mar '05 9.56E-16 0.001 3.7% 2.13E-06Apr '05 2.71E-16 0.001 4.1% 2.98E-06

May '05 4.90E-16 0.001 4.2% 2.64E-06J un '05 1.15E-16 0.001 3.6% 1.86E-06J ul '05 1.91E-16 0.001 3.0% 1.29E-06

Aug '05 4.56E-17 0.001 2.5% 1.16E-06Sep '05 3.47E-16 0.001 3.8% 2.36E-06Oct '05 1.13E-15 0.001 4.0% 2.51E-06

Nov '05 7.19E-16 0.002 5.6% 5.06E-06Dec '05 2.71E-16 0.002 5.4% 4.36E-06

Year 4.45E-16 0.001 3.9% 2.53E-06

Fraction Difference

Fraction Difference

Average Daily Fraction DifferencesAbs. Fraction Diff Abs. % Fraction Diff RMSE

Abs. Fraction Diff Abs. % Fraction Diff RMSE

BUSNODEMBUSNODEMFWESTFWEST

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ERCOTERCOTLoad Research Sample to Load Research Sample to Profile Comparison Profile Comparison

July 24, 2006

BUSNODEMBUSNODEMNCENTNCENT

Reflecting Prospective 2006 Reflecting Prospective 2006 AV Profile ID ChangesAV Profile ID Changes

Page 77: ERCOT Load Research Sample to Profile Comparison July 24, 2006 BUSNODEMCOAST Reflecting Prospective 2006 AV Profile ID Changes

77

Distribution of Sample PrecisionDistribution of Sample Precision

90% Confidence

0

2,000

4,000

6,000

8,000

10,000

12,000

Percent Accuracy

Inte

rva

l Co

un

t

BUSNODEMBUSNODEMNCENTNCENT

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78

Profile and Sample ComparisonProfile and Sample Comparison

1 Day of lowest total absolute kWh difference for 01/01/05 thru 12/31/05

Comparison for 11/24/05

0.0

0.1

0.2

0.3

0.4

0.5

0.6

0.7

0.8

Interval

kW

h

Sample Profile Lower Confidence Limit Upper Confidence Limit

1

(Thursday)

BUSNODEMBUSNODEMNCENTNCENT

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79

Profile and Sample ComparisonProfile and Sample Comparison

2 Day of 25th percentile total absolute kWh difference for 01/01/05 thru 12/31/05

Comparison for 03/14/05

0.0

0.1

0.2

0.3

0.4

0.5

0.6

0.7

0.8

Interval

kW

h

Sample Profile Lower Confidence Limit Upper Confidence Limit

2

(Monday)

BUSNODEMBUSNODEMNCENTNCENT

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80

Profile and Sample ComparisonProfile and Sample Comparison

3 Day of median total absolute kWh difference for 01/01/05 thru 12/31/05

Comparison for 10/24/05

0.0

0.1

0.2

0.3

0.4

0.5

0.6

0.7

0.8

Interval

kW

h

Sample Profile Lower Confidence Limit Upper Confidence Limit

3

(Monday)

BUSNODEMBUSNODEMNCENTNCENT

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81

Profile and Sample ComparisonProfile and Sample Comparison

4 Day of 75th percentile total absolute kWh difference for 01/01/05 thru 12/31/05

Comparison for 09/24/05

0.0

0.1

0.2

0.3

0.4

0.5

0.6

0.7

0.8

Interval

kW

h

Sample Profile Lower Confidence Limit Upper Confidence Limit

4

(Saturday)

BUSNODEMBUSNODEMNCENTNCENT

Page 82: ERCOT Load Research Sample to Profile Comparison July 24, 2006 BUSNODEMCOAST Reflecting Prospective 2006 AV Profile ID Changes

82

Profile and Sample ComparisonProfile and Sample Comparison

5 Day of highest total absolute kWh difference for 01/01/05 thru 12/31/05

Comparison for 08/24/05

0.0

0.1

0.2

0.3

0.4

0.5

0.6

0.7

0.8

Interval

kW

h

Sample Profile Lower Confidence Limit Upper Confidence Limit

5

(Wednesday)

BUSNODEMBUSNODEMNCENTNCENT

Page 83: ERCOT Load Research Sample to Profile Comparison July 24, 2006 BUSNODEMCOAST Reflecting Prospective 2006 AV Profile ID Changes

83

Profile and Sample Comparison: Scaled Profile and Sample Comparison: Scaled LRSLRS

5 Day of highest total absolute kWh difference for 01/01/05 thru 12/31/05

Comparison for 08/24/05

0.0

0.1

0.2

0.3

0.4

0.5

0.6

0.7

0.8

Interval

kW

h

Scaled Sample Profile Lower Confidence Limit Upper Confidence Limit

5

(Wednesday)

BUSNODEMBUSNODEMNCENTNCENT

Page 84: ERCOT Load Research Sample to Profile Comparison July 24, 2006 BUSNODEMCOAST Reflecting Prospective 2006 AV Profile ID Changes

84

Profile and Sample ComparisonProfile and Sample Comparison

Monthly kWh

0

200

400

600

800

1,000

1,200

Jan '05 Feb '05 Mar '05 Apr '05 May '05 Jun '05 Jul '05 Aug '05 Sep '05 Oct '05 Nov '05 Dec '05

kW

h

Profile Sample

BUSNODEMBUSNODEMNCENTNCENT

Page 85: ERCOT Load Research Sample to Profile Comparison July 24, 2006 BUSNODEMCOAST Reflecting Prospective 2006 AV Profile ID Changes

85

Profile and Sample DifferencesProfile and Sample Differences

Distribution of Absolute kWh Differences

0

2,000

4,000

6,000

8,000

10,000

12,000

14,000

16,000

kWh Range

Inte

rva

l Co

un

t

BUSNODEMBUSNODEMNCENTNCENT

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Profile and Sample DifferencesProfile and Sample Differences

Statistically Significant Differences

0

10

20

30

40

50

60

70

80

90

100

<= 0.06 0.07 - 0.08 0.09 - 0.10 0.11 - 0.12 0.13 - 0.14 0.15 - 0.16 0.17 - 0.18 0.19 - 0.20 > 0.20

Sample kWh Range

Pe

rce

nt

Unscaled Sample Scaled Sample

BUSNODEMBUSNODEMNCENTNCENT

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Profile and Sample DifferencesProfile and Sample Differences

Statistically Significant Differences

0

10

20

30

40

50

60

70

80

90

100

Pe

rce

nt

Unscaled Sample Scaled Sample

BUSNODEMBUSNODEMNCENTNCENT

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Profile and Sample DifferencesProfile and Sample Differences

Median Differences -- Scaled Sample minus Profilefor 01/01/05 thru 12/31/05

-0.4

-0.3

-0.2

-0.1

0.0

0.1

0.2

0.3

0.4

kWh

Median 5th Percentile 95th Percentile

Sun Mon Tue Wed Thu Fri Sat Hol

BUSNODEMBUSNODEMNCENTNCENT

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89

Differences for 1Differences for 1stst Quarter 2005 Quarter 2005

Median Differences -- Scaled Sample minus Profile

-0.4

-0.3

-0.2

-0.1

0.0

0.1

0.2

0.3

0.4

kW

h

Median 5th Percentile 95th Percentile

Sun Mon Tue Wed Thu Fri Sat Hol

BUSNODEMBUSNODEMNCENTNCENT

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90

Differences for 2Differences for 2ndnd Quarter 2005 Quarter 2005

Median Differences -- Scaled Sample minus Profile

-0.4

-0.3

-0.2

-0.1

0.0

0.1

0.2

0.3

0.4

kW

h

Median 5th Percentile 95th Percentile

Sun Mon Tue Wed Thu Fri Sat Hol

BUSNODEMBUSNODEMNCENTNCENT

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91

Differences for 3Differences for 3rdrd Quarter 2005 Quarter 2005

Median Differences -- Scaled Sample minus Profile

-0.4

-0.3

-0.2

-0.1

0.0

0.1

0.2

0.3

0.4

kW

h

Median 5th Percentile 95th Percentile

Sun Mon Tue Wed Thu Fri Sat Hol

BUSNODEMBUSNODEMNCENTNCENT

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92

Differences for 4Differences for 4thth Quarter 2005 Quarter 2005

Median Differences -- Scaled Sample minus Profile

-0.4

-0.3

-0.2

-0.1

0.0

0.1

0.2

0.3

0.4

kW

h

Median 5th Percentile 95th Percentile

Sun Mon Tue Wed Thu Fri Sat Hol

BUSNODEMBUSNODEMNCENTNCENT

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93

Profile and Unscaled Sample DifferencesProfile and Unscaled Sample Differences

(Unscaled Sample minus Profile) vs. Profile for 01/01/05 thru 12/31/05

-180

-160

-140

-120

-100

-80

-60

-40

-20

0

20

0.0 0.1 0.2 0.3 0.4 0.5 0.6

Profile Interval kWh

Pe

rce

nt

Dif

fere

nc

e

Median 5th Percentile 95th Percentile Regression on Profile kWh

BUSNODEMBUSNODEMNCENTNCENT

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94

Profile and Scaled Sample DifferencesProfile and Scaled Sample Differences

(Scaled Sample minus Profile) vs. Profile for 01/01/05 thru 12/31/05

-120

-100

-80

-60

-40

-20

0

20

40

60

80

100

0.0 0.1 0.2 0.3 0.4 0.5 0.6

Profile Interval kWh

Pe

rce

nt

Dif

fere

nc

e

Median 5th Percentile 95th Percentile Regression on Profile kWh

BUSNODEMBUSNODEMNCENTNCENT

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Profile and Sample DifferencesProfile and Sample Differences

Distribution of kWh Percent Differences[(sample - profile) / sample]

0

2,000

4,000

6,000

8,000

10,000

12,000

14,000

16,000

18,000

20,000

Percent Difference

Inte

rva

l Co

un

t

Unscaled Sample Scaled Sample

BUSNODEMBUSNODEMNCENTNCENT

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Profile and Sample DifferencesProfile and Sample Differences

J an '05 66.0% 67.0%Feb '05 63.3% 72.4%Mar '05 59.4% 75.6%Apr '05 60.7% 61.3%

May '05 61.3% 59.3%J un '05 68.9% 64.3%J ul '05 65.0% 64.9%

Aug '05 71.2% 65.8%Sep '05 72.1% 61.0%Oct '05 63.7% 61.9%

Nov '05 61.1% 66.3%Dec '05 68.2% 60.2%

Year 56.4% 52.1%

ProfileLRSLoad Factor

BUSNODEMBUSNODEMNCENTNCENT

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97

Profile and Sample DifferencesProfile and Sample Differences

J an '05 267 308 550 510 48.5% 60.4%Feb '05 223 263 477 438 46.8% 60.0%Mar '05 258 310 462 410 55.8% 75.7%Apr '05 206 263 481 424 42.9% 62.0%

May '05 250 304 527 473 47.5% 64.2%J un '05 341 412 585 514 58.3% 80.1%J ul '05 286 349 680 617 42.2% 56.5%

Aug '05 373 446 625 552 59.6% 80.7%Sep '05 314 384 634 564 49.5% 68.2%Oct '05 255 313 518 460 49.2% 68.2%

Nov '05 244 295 482 431 50.5% 68.4%Dec '05 253 297 572 528 44.2% 56.2%

Year 3,270 3,943 6,594 5,921 49.6% 66.6%

Note: On-Peak is 7 a.m. to 10 p.m., non-holiday weekdays.

On-Peak and Off-Peak kWh

Profile LRS ProfileLRS Profile LRS

On-Peak / Off-PeakOn-Peak kWh Off-Peak kWh

BUSNODEMBUSNODEMNCENTNCENT

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98

Profile and Sample DifferencesProfile and Sample Differences

LRS ProfileJ an '05 8.5% 8.3%Feb '05 7.4% 7.1%Mar '05 7.7% 7.3%Apr '05 7.1% 7.0%

May '05 7.9% 7.9%J un '05 8.8% 9.4%J ul '05 9.3% 9.8%

Aug '05 9.4% 10.1%Sep '05 9.1% 9.6%Oct '05 8.1% 7.8%

Nov '05 7.7% 7.4%Dec '05 8.8% 8.4%

Monthly kWh as a Percentage of the Year

BUSNODEMBUSNODEMNCENTNCENT

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Profile and Sample DifferencesProfile and Sample Differences

Day of Week Absolute Diff Absolute % Diff RMSESun 0.022 0.048 18.0% 0.003Mon -0.008 0.071 26.4% 0.006Tue -0.007 0.072 26.2% 0.006Wed -0.009 0.069 25.2% 0.006Thu -0.007 0.070 25.6% 0.006Fri -0.005 0.071 26.1% 0.006Sat 0.011 0.061 24.2% 0.004

Holiday 0.015 0.065 26.2% 0.005

Month & Year Absolute Diff Absolute % Diff RMSEJ an '05 -2.13E-15 0.053 21.5% 0.004Feb '05 -2.23E-15 0.056 23.4% 0.004Mar '05 5.93E-16 0.058 25.6% 0.004Apr '05 2.23E-15 0.065 28.3% 0.005

May '05 2.30E-15 0.066 25.9% 0.005J un '05 7.19E-16 0.079 24.5% 0.007J ul '05 -8.08E-16 0.077 23.8% 0.007

Aug '05 -1.17E-15 0.075 22.4% 0.007Sep '05 -5.08E-17 0.087 26.8% 0.009Oct '05 1.08E-15 0.064 25.8% 0.005

Nov '05 -8.82E-16 0.054 23.3% 0.004Dec '05 -3.08E-15 0.058 23.3% 0.004

Year -2.79E-16 0.066 24.5% 0.005

Net Difference

Net Difference

Mean Scaled kWh Differences BUSNODEMBUSNODEMNCENTNCENT

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Profile and Sample DifferencesProfile and Sample Differences

Day of WeekSun 0.003 0.003 8.7% 7.97E-06Mon -0.001 0.001 3.6% 2.20E-06Tue -0.001 0.001 3.3% 1.89E-06Wed -0.001 0.001 3.7% 2.44E-06Thu -0.001 0.001 4.0% 3.01E-06Fri -0.001 0.001 3.2% 1.78E-06Sat 0.001 0.001 4.5% 2.88E-06

Holiday 0.002 0.002 8.1% 9.09E-06

Month & YearJ an '05 -3.92E-16 0.001 3.4% 2.02E-06Feb '05 -3.29E-16 0.001 4.0% 3.34E-06Mar '05 3.36E-19 0.001 4.1% 2.83E-06Apr '05 2.73E-16 0.002 5.3% 4.47E-06

May '05 4.40E-16 0.001 4.6% 3.36E-06J un '05 2.26E-17 0.001 3.0% 1.37E-06J ul '05 -4.19E-17 0.001 4.2% 2.38E-06

Aug '05 -1.92E-16 0.001 3.9% 2.11E-06Sep '05 6.30E-17 0.001 4.4% 2.78E-06Oct '05 7.45E-17 0.002 5.8% 4.94E-06

Nov '05 -2.18E-16 0.002 6.2% 5.76E-06Dec '05 -2.36E-16 0.002 5.1% 4.28E-06

Year -4.32E-17 0.001 4.5% 3.30E-06

Fraction Difference

Fraction Difference

Average Daily Fraction DifferencesAbs. Fraction Diff Abs. % Fraction Diff RMSE

Abs. Fraction Diff Abs. % Fraction Diff RMSE

BUSNODEMBUSNODEMNCENTNCENT

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ERCOTERCOTLoad Research Sample to Load Research Sample to Profile Comparison Profile Comparison

July 24, 2006

BUSNODEMBUSNODEMNORTHNORTH

Reflecting Prospective 2006 Reflecting Prospective 2006 AV Profile ID ChangesAV Profile ID Changes

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Distribution of Sample PrecisionDistribution of Sample Precision

90% Confidence

0

1,000

2,000

3,000

4,000

5,000

6,000

7,000

8,000

Percent Accuracy

Inte

rva

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un

t

BUSNODEMBUSNODEMNORTHNORTH

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Profile and Sample ComparisonProfile and Sample Comparison

1 Day of lowest total absolute kWh difference for 01/01/05 thru 12/31/05

Comparison for 05/15/05

0.0

0.1

0.2

0.3

0.4

0.5

0.6

0.7

0.8

Interval

kW

h

Sample Profile Lower Confidence Limit Upper Confidence Limit

1

(Sunday)

BUSNODEMBUSNODEMNORTHNORTH

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104

Profile and Sample ComparisonProfile and Sample Comparison

2 Day of 25th percentile total absolute kWh difference for 01/01/05 thru 12/31/05

Comparison for 03/31/05

0.0

0.1

0.2

0.3

0.4

0.5

0.6

0.7

0.8

Interval

kW

h

Sample Profile Lower Confidence Limit Upper Confidence Limit

2

(Thursday)

BUSNODEMBUSNODEMNORTHNORTH

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105

Profile and Sample ComparisonProfile and Sample Comparison

3 Day of median total absolute kWh difference for 01/01/05 thru 12/31/05

Comparison for 11/22/05

0.0

0.1

0.2

0.3

0.4

0.5

0.6

0.7

0.8

Interval

kW

h

Sample Profile Lower Confidence Limit Upper Confidence Limit

3

(Tuesday)

BUSNODEMBUSNODEMNORTHNORTH

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106

Profile and Sample ComparisonProfile and Sample Comparison

4 Day of 75th percentile total absolute kWh difference for 01/01/05 thru 12/31/05

Comparison for 09/08/05

0.0

0.1

0.2

0.3

0.4

0.5

0.6

0.7

0.8

Interval

kW

h

Sample Profile Lower Confidence Limit Upper Confidence Limit

4

(Thursday)

BUSNODEMBUSNODEMNORTHNORTH

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Profile and Sample ComparisonProfile and Sample Comparison

5 Day of highest total absolute kWh difference for 01/01/05 thru 12/31/05

Comparison for 12/09/05

0.0

0.1

0.2

0.3

0.4

0.5

0.6

0.7

0.8

Interval

kW

h

Sample Profile Lower Confidence Limit Upper Confidence Limit

5

(Friday)

BUSNODEMBUSNODEMNORTHNORTH

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108

Profile and Sample Comparison: Scaled Profile and Sample Comparison: Scaled LRSLRS

5 Day of highest total absolute kWh difference for 01/01/05 thru 12/31/05

Comparison for 12/09/05

0.0

0.1

0.2

0.3

0.4

0.5

0.6

0.7

0.8

Interval

kW

h

Scaled Sample Profile Lower Confidence Limit Upper Confidence Limit

5

(Friday)

BUSNODEMBUSNODEMNORTHNORTH

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Profile and Sample ComparisonProfile and Sample Comparison

Monthly kWh

0

200

400

600

800

1,000

1,200

Jan '05 Feb '05 Mar '05 Apr '05 May '05 Jun '05 Jul '05 Aug '05 Sep '05 Oct '05 Nov '05 Dec '05

kW

h

Profile Sample

BUSNODEMBUSNODEMNORTHNORTH

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Profile and Sample DifferencesProfile and Sample Differences

Distribution of Absolute kWh Differences

0

1,000

2,000

3,000

4,000

5,000

6,000

7,000

8,000

9,000

kWh Range

Inte

rva

l Co

un

t

BUSNODEMBUSNODEMNORTHNORTH

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Profile and Sample DifferencesProfile and Sample Differences

Statistically Significant Differences

0

10

20

30

40

50

60

70

80

90

100

<= 0.06 0.07 - 0.08 0.09 - 0.10 0.11 - 0.12 0.13 - 0.14 0.15 - 0.16 0.17 - 0.18 0.19 - 0.20 > 0.20

Sample kWh Range

Pe

rce

nt

Unscaled Sample Scaled Sample

BUSNODEMBUSNODEMNORTHNORTH

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112

Profile and Sample DifferencesProfile and Sample Differences

Statistically Significant Differences

0

10

20

30

40

50

60

70

80

90

100

Pe

rce

nt

Unscaled Sample Scaled Sample

BUSNODEMBUSNODEMNORTHNORTH

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Profile and Sample DifferencesProfile and Sample Differences

Median Differences -- Scaled Sample minus Profilefor 01/01/05 thru 12/31/05

-0.4

-0.3

-0.2

-0.1

0.0

0.1

0.2

0.3

0.4

kWh

Median 5th Percentile 95th Percentile

Sun Mon Tue Wed Thu Fri Sat Hol

BUSNODEMBUSNODEMNORTHNORTH

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114

Differences for 1Differences for 1stst Quarter 2005 Quarter 2005

Median Differences -- Scaled Sample minus Profile

-0.4

-0.3

-0.2

-0.1

0.0

0.1

0.2

0.3

0.4

kW

h

Median 5th Percentile 95th Percentile

Sun Mon Tue Wed Thu Fri Sat Hol

BUSNODEMBUSNODEMNORTHNORTH

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115

Differences for 2Differences for 2ndnd Quarter 2005 Quarter 2005

Median Differences -- Scaled Sample minus Profile

-0.4

-0.3

-0.2

-0.1

0.0

0.1

0.2

0.3

0.4

kW

h

Median 5th Percentile 95th Percentile

Sun Mon Tue Wed Thu Fri Sat Hol

BUSNODEMBUSNODEMNORTHNORTH

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116

Differences for 3Differences for 3rdrd Quarter 2005 Quarter 2005

Median Differences -- Scaled Sample minus Profile

-0.4

-0.3

-0.2

-0.1

0.0

0.1

0.2

0.3

0.4

kW

h

Median 5th Percentile 95th Percentile

Sun Mon Tue Wed Thu Fri Sat Hol

BUSNODEMBUSNODEMNORTHNORTH

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117

Differences for 4Differences for 4thth Quarter 2005 Quarter 2005

Median Differences -- Scaled Sample minus Profile

-0.4

-0.3

-0.2

-0.1

0.0

0.1

0.2

0.3

0.4

kW

h

Median 5th Percentile 95th Percentile

Sun Mon Tue Wed Thu Fri Sat Hol

BUSNODEMBUSNODEMNORTHNORTH

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118

Profile and Unscaled Sample DifferencesProfile and Unscaled Sample Differences

(Unscaled Sample minus Profile) vs. Profile for 01/01/05 thru 12/31/05

-200

-180

-160

-140

-120

-100

-80

-60

-40

-20

0

0.0 0.1 0.2 0.3 0.4 0.5 0.6

Profile Interval kWh

Pe

rce

nt

Dif

fere

nc

e

Median 5th Percentile 95th Percentile Regression on Profile kWh

BUSNODEMBUSNODEMNORTHNORTH

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119

Profile and Scaled Sample DifferencesProfile and Scaled Sample Differences

(Scaled Sample minus Profile) vs. Profile for 01/01/05 thru 12/31/05

-120

-100

-80

-60

-40

-20

0

20

40

60

80

100

0.0 0.1 0.2 0.3 0.4 0.5 0.6

Profile Interval kWh

Pe

rce

nt

Dif

fere

nc

e

Median 5th Percentile 95th Percentile Regression on Profile kWh

BUSNODEMBUSNODEMNORTHNORTH

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Profile and Sample DifferencesProfile and Sample Differences

Distribution of kWh Percent Differences[(sample - profile) / sample]

0

2,000

4,000

6,000

8,000

10,000

12,000

14,000

16,000

18,000

20,000

Percent Difference

Inte

rva

l Co

un

t

Unscaled Sample Scaled Sample

BUSNODEMBUSNODEMNORTHNORTH

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Profile and Sample DifferencesProfile and Sample Differences

J an '05 57.3% 64.5%Feb '05 55.4% 71.6%Mar '05 56.0% 72.4%Apr '05 60.0% 65.1%

May '05 48.7% 59.6%J un '05 55.2% 60.0%J ul '05 53.1% 61.9%

Aug '05 55.4% 64.3%Sep '05 52.1% 62.5%Oct '05 51.7% 61.9%

Nov '05 53.9% 70.0%Dec '05 56.1% 59.7%

Year 46.5% 53.7%

ProfileLRSLoad Factor

BUSNODEMBUSNODEMNORTHNORTH

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122

Profile and Sample DifferencesProfile and Sample Differences

J an '05 335 314 510 531 65.8% 59.1%Feb '05 277 268 435 444 63.7% 60.4%Mar '05 315 313 417 419 75.4% 74.8%Apr '05 249 252 425 421 58.6% 59.9%

May '05 299 303 464 459 64.4% 66.0%J un '05 405 407 494 492 82.1% 82.7%J ul '05 349 345 591 595 59.2% 58.0%

Aug '05 440 443 536 533 82.0% 83.2%Sep '05 362 367 537 533 67.4% 68.8%Oct '05 298 302 458 454 65.0% 66.6%

Nov '05 283 293 443 433 63.9% 67.7%Dec '05 314 309 539 545 58.3% 56.6%

Year 3,926 3,916 5,848 5,859 67.1% 66.8%

Note: On-Peak is 7 a.m. to 10 p.m., non-holiday weekdays.

On-Peak and Off-Peak kWh

Profile LRS ProfileLRS Profile LRS

On-Peak / Off-PeakOn-Peak kWh Off-Peak kWh

BUSNODEMBUSNODEMNORTHNORTH

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123

Profile and Sample DifferencesProfile and Sample Differences

LRS ProfileJ an '05 8.7% 8.6%Feb '05 7.5% 7.3%Mar '05 7.5% 7.5%Apr '05 6.7% 6.9%

May '05 7.8% 7.8%J un '05 9.2% 9.2%J ul '05 9.9% 9.6%

Aug '05 10.2% 10.0%Sep '05 9.3% 9.2%Oct '05 7.5% 7.7%

Nov '05 7.2% 7.4%Dec '05 8.5% 8.7%

Monthly kWh as a Percentage of the Year

BUSNODEMBUSNODEMNORTHNORTH

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124

Profile and Sample DifferencesProfile and Sample Differences

Day of Week Absolute Diff Absolute % Diff RMSESun -0.004 0.025 11.6% 0.001Mon 0.000 0.030 10.2% 0.001Tue 0.006 0.030 9.8% 0.002Wed 0.006 0.031 10.1% 0.002Thu 0.004 0.031 10.3% 0.002Fri -0.002 0.029 10.3% 0.002Sat -0.009 0.026 11.4% 0.001

Holiday -0.001 0.029 12.8% 0.001

Month & Year Absolute Diff Absolute % Diff RMSEJ an '05 -2.61E-15 0.034 12.0% 0.002Feb '05 -2.12E-15 0.027 10.0% 0.001Mar '05 6.76E-16 0.021 8.8% 0.001Apr '05 2.29E-15 0.023 9.9% 0.001

May '05 2.92E-15 0.029 11.7% 0.002J un '05 1.13E-15 0.030 10.1% 0.001J ul '05 -4.83E-17 0.032 10.6% 0.002

Aug '05 6.32E-16 0.028 9.2% 0.001Sep '05 1.32E-15 0.032 10.9% 0.002Oct '05 -5.87E-16 0.024 9.8% 0.001

Nov '05 -2.70E-16 0.029 11.6% 0.002Dec '05 -2.71E-15 0.035 12.1% 0.002

Year 5.84E-17 0.029 10.6% 0.001

Net Difference

Net Difference

Mean Scaled kWh Differences BUSNODEMBUSNODEMNORTHNORTH

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Profile and Sample DifferencesProfile and Sample Differences

Day of WeekSun 0.000 0.001 5.6% 4.00E-06Mon 0.000 0.001 4.3% 3.58E-06Tue 0.001 0.002 4.2% 3.96E-06Wed 0.001 0.002 5.1% 5.33E-06Thu 0.000 0.002 4.2% 3.86E-06Fri 0.000 0.001 4.1% 3.43E-06Sat -0.001 0.001 5.1% 2.91E-06

Holiday 0.000 0.002 7.3% 5.66E-06

Month & YearJ an '05 -3.21E-16 0.002 7.7% 8.79E-06Feb '05 -3.16E-16 0.002 4.6% 3.85E-06Mar '05 4.00E-17 0.001 3.7% 1.96E-06Apr '05 2.67E-16 0.001 3.3% 2.15E-06

May '05 2.93E-16 0.002 5.1% 3.72E-06J un '05 1.51E-16 0.001 4.0% 2.99E-06J ul '05 4.85E-17 0.002 5.4% 4.08E-06

Aug '05 5.83E-17 0.001 3.3% 1.64E-06Sep '05 1.22E-16 0.001 3.8% 2.27E-06Oct '05 1.31E-17 0.001 2.8% 1.70E-06

Nov '05 -9.31E-17 0.002 5.7% 4.72E-06Dec '05 -3.54E-16 0.002 7.3% 8.90E-06

Year -6.36E-18 0.002 4.7% 3.91E-06

Fraction Difference

Fraction Difference

Average Daily Fraction DifferencesAbs. Fraction Diff Abs. % Fraction Diff RMSE

Abs. Fraction Diff Abs. % Fraction Diff RMSE

BUSNODEMBUSNODEMNORTHNORTH

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July 24, 2006

BUSNODEMBUSNODEMSCENTSCENT

Reflecting Prospective 2006 Reflecting Prospective 2006 AV Profile ID ChangesAV Profile ID Changes

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127

Distribution of Sample PrecisionDistribution of Sample Precision

90% Confidence

0

1,000

2,000

3,000

4,000

5,000

6,000

7,000

8,000

Percent Accuracy

Inte

rva

l Co

un

t

BUSNODEMBUSNODEMSCENTSCENT

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Profile and Sample ComparisonProfile and Sample Comparison

1 Day of lowest total absolute kWh difference for 01/01/05 thru 12/31/05

Comparison for 03/12/05

0.0

0.1

0.2

0.3

0.4

0.5

0.6

0.7

0.8

Interval

kW

h

Sample Profile Lower Confidence Limit Upper Confidence Limit

1

(Saturday)

BUSNODEMBUSNODEMSCENTSCENT

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Profile and Sample ComparisonProfile and Sample Comparison

2 Day of 25th percentile total absolute kWh difference for 01/01/05 thru 12/31/05

Comparison for 03/09/05

0.0

0.1

0.2

0.3

0.4

0.5

0.6

0.7

0.8

Interval

kW

h

Sample Profile Lower Confidence Limit Upper Confidence Limit

2

(Wednesday)

BUSNODEMBUSNODEMSCENTSCENT

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Profile and Sample ComparisonProfile and Sample Comparison

3 Day of median total absolute kWh difference for 01/01/05 thru 12/31/05

Comparison for 11/10/05

0.0

0.1

0.2

0.3

0.4

0.5

0.6

0.7

0.8

Interval

kW

h

Sample Profile Lower Confidence Limit Upper Confidence Limit

3

(Thursday)

BUSNODEMBUSNODEMSCENTSCENT

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Profile and Sample ComparisonProfile and Sample Comparison

4 Day of 75th percentile total absolute kWh difference for 01/01/05 thru 12/31/05

Comparison for 03/16/05

0.0

0.1

0.2

0.3

0.4

0.5

0.6

0.7

0.8

Interval

kW

h

Sample Profile Lower Confidence Limit Upper Confidence Limit

4

(Wednesday)

BUSNODEMBUSNODEMSCENTSCENT

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Profile and Sample ComparisonProfile and Sample Comparison

5 Day of highest total absolute kWh difference for 01/01/05 thru 12/31/05

Comparison for 09/23/05

0.0

0.1

0.2

0.3

0.4

0.5

0.6

0.7

0.8

Interval

kW

h

Sample Profile Lower Confidence Limit Upper Confidence Limit

5

(Friday)

BUSNODEMBUSNODEMSCENTSCENT

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133

Profile and Sample Comparison: Scaled Profile and Sample Comparison: Scaled LRSLRS

5 Day of highest total absolute kWh difference for 01/01/05 thru 12/31/05

Comparison for 09/23/05

0.0

0.1

0.2

0.3

0.4

0.5

0.6

0.7

0.8

Interval

kW

h

Scaled Sample Profile Lower Confidence Limit Upper Confidence Limit

5

(Friday)

BUSNODEMBUSNODEMSCENTSCENT

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Profile and Sample ComparisonProfile and Sample Comparison

Monthly kWh

0

200

400

600

800

1,000

1,200

Jan '05 Feb '05 Mar '05 Apr '05 May '05 Jun '05 Jul '05 Aug '05 Sep '05 Oct '05 Nov '05 Dec '05

kW

h

Profile Sample

BUSNODEMBUSNODEMSCENTSCENT

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Profile and Sample DifferencesProfile and Sample Differences

Distribution of Absolute kWh Differences

0

1,000

2,000

3,000

4,000

5,000

6,000

7,000

8,000

kWh Range

Inte

rva

l Co

un

t

BUSNODEMBUSNODEMSCENTSCENT

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Profile and Sample DifferencesProfile and Sample Differences

Statistically Significant Differences

0

10

20

30

40

50

60

70

80

90

100

<= 0.06 0.07 - 0.08 0.09 - 0.10 0.11 - 0.12 0.13 - 0.14 0.15 - 0.16 0.17 - 0.18 0.19 - 0.20 > 0.20

Sample kWh Range

Pe

rce

nt

Unscaled Sample Scaled Sample

BUSNODEMBUSNODEMSCENTSCENT

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Profile and Sample DifferencesProfile and Sample Differences

Statistically Significant Differences

0

10

20

30

40

50

60

70

80

90

100

Pe

rce

nt

Unscaled Sample Scaled Sample

BUSNODEMBUSNODEMSCENTSCENT

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Profile and Sample DifferencesProfile and Sample Differences

Median Differences -- Scaled Sample minus Profilefor 01/01/05 thru 12/31/05

-0.4

-0.3

-0.2

-0.1

0.0

0.1

0.2

0.3

0.4

kWh

Median 5th Percentile 95th Percentile

Sun Mon Tue Wed Thu Fri Sat Hol

BUSNODEMBUSNODEMSCENTSCENT

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139

Differences for 1Differences for 1stst Quarter 2005 Quarter 2005

Median Differences -- Scaled Sample minus Profile

-0.4

-0.3

-0.2

-0.1

0.0

0.1

0.2

0.3

0.4

kW

h

Median 5th Percentile 95th Percentile

Sun Mon Tue Wed Thu Fri Sat Hol

BUSNODEMBUSNODEMSCENTSCENT

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140

Differences for 2Differences for 2ndnd Quarter 2005 Quarter 2005

Median Differences -- Scaled Sample minus Profile

-0.4

-0.3

-0.2

-0.1

0.0

0.1

0.2

0.3

0.4

kW

h

Median 5th Percentile 95th Percentile

Sun Mon Tue Wed Thu Fri Sat Hol

BUSNODEMBUSNODEMSCENTSCENT

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141

Differences for 3Differences for 3rdrd Quarter 2005 Quarter 2005

Median Differences -- Scaled Sample minus Profile

-0.4

-0.3

-0.2

-0.1

0.0

0.1

0.2

0.3

0.4

kW

h

Median 5th Percentile 95th Percentile

Sun Mon Tue Wed Thu Fri Sat Hol

BUSNODEMBUSNODEMSCENTSCENT

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142

Differences for 4Differences for 4thth Quarter 2005 Quarter 2005

Median Differences -- Scaled Sample minus Profile

-0.4

-0.3

-0.2

-0.1

0.0

0.1

0.2

0.3

0.4

kW

h

Median 5th Percentile 95th Percentile

Sun Mon Tue Wed Thu Fri Sat Hol

BUSNODEMBUSNODEMSCENTSCENT

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143

Profile and Unscaled Sample DifferencesProfile and Unscaled Sample Differences

(Unscaled Sample minus Profile) vs. Profile for 01/01/05 thru 12/31/05

-200

-150

-100

-50

0

50

0.0 0.1 0.2 0.3 0.4 0.5 0.6

Profile Interval kWh

Pe

rce

nt

Dif

fere

nc

e

Median 5th Percentile 95th Percentile Regression on Profile kWh

BUSNODEMBUSNODEMSCENTSCENT

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144

Profile and Scaled Sample DifferencesProfile and Scaled Sample Differences

(Scaled Sample minus Profile) vs. Profile for 01/01/05 thru 12/31/05

-120

-100

-80

-60

-40

-20

0

20

40

60

80

100

0.0 0.1 0.2 0.3 0.4 0.5 0.6

Profile Interval kWh

Pe

rce

nt

Dif

fere

nc

e

Median 5th Percentile 95th Percentile Regression on Profile kWh

BUSNODEMBUSNODEMSCENTSCENT

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Profile and Sample DifferencesProfile and Sample Differences

Distribution of kWh Percent Differences[(sample - profile) / sample]

0

5,000

10,000

15,000

20,000

25,000

Percent Difference

Inte

rva

l Co

un

t

Unscaled Sample Scaled Sample

BUSNODEMBUSNODEMSCENTSCENT

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146

Profile and Sample DifferencesProfile and Sample Differences

J an '05 46.4% 61.5%Feb '05 54.3% 66.1%Mar '05 52.3% 73.2%Apr '05 45.8% 63.3%

May '05 46.7% 62.1%J un '05 53.1% 62.4%J ul '05 51.7% 60.2%

Aug '05 53.0% 64.9%Sep '05 50.0% 60.7%Oct '05 51.6% 62.4%

Nov '05 51.9% 71.5%Dec '05 44.6% 53.1%

Year 42.8% 52.0%

ProfileLRSLoad Factor

BUSNODEMBUSNODEMSCENTSCENT

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147

Profile and Sample DifferencesProfile and Sample Differences

J an '05 295 302 565 559 52.2% 54.0%Feb '05 253 261 493 485 51.3% 53.8%Mar '05 282 311 481 452 58.7% 68.7%Apr '05 226 263 503 465 45.0% 56.6%

May '05 273 303 540 510 50.6% 59.4%J un '05 368 405 585 547 62.9% 74.0%J ul '05 319 349 684 654 46.7% 53.3%

Aug '05 423 451 621 592 68.1% 76.2%Sep '05 365 386 631 610 57.9% 63.2%Oct '05 298 309 519 509 57.3% 60.7%

Nov '05 293 299 490 483 59.7% 62.0%Dec '05 285 292 585 577 48.8% 50.7%

Year 3,680 3,931 6,696 6,445 55.0% 61.0%

Note: On-Peak is 7 a.m. to 10 p.m., non-holiday weekdays.

On-Peak and Off-Peak kWh

Profile LRS ProfileLRS Profile LRS

On-Peak / Off-PeakOn-Peak kWh Off-Peak kWh

BUSNODEMBUSNODEMSCENTSCENT

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148

Profile and Sample DifferencesProfile and Sample Differences

LRS ProfileJ an '05 8.6% 8.3%Feb '05 7.1% 7.2%Mar '05 7.5% 7.3%Apr '05 7.0% 7.0%

May '05 7.8% 7.8%J un '05 9.2% 9.2%J ul '05 9.5% 9.7%

Aug '05 9.7% 10.1%Sep '05 9.4% 9.6%Oct '05 8.3% 7.9%

Nov '05 7.4% 7.5%Dec '05 8.5% 8.4%

Monthly kWh as a Percentage of the Year

BUSNODEMBUSNODEMSCENTSCENT

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149

Profile and Sample DifferencesProfile and Sample Differences

Day of Week Absolute Diff Absolute % Diff RMSESun 0.011 0.032 12.6% 0.002Mon -0.015 0.043 15.9% 0.003Tue 0.000 0.049 15.9% 0.004Wed -0.001 0.052 16.6% 0.004Thu -0.005 0.046 15.3% 0.003Fri -0.005 0.047 15.6% 0.004Sat 0.014 0.043 14.5% 0.004

Holiday -0.003 0.032 14.2% 0.002

Month & Year Absolute Diff Absolute % Diff RMSEJ an '05 -1.85E-15 0.047 17.4% 0.004Feb '05 -6.33E-15 0.036 13.8% 0.002Mar '05 -3.69E-15 0.043 18.4% 0.003Apr '05 -3.72E-16 0.046 18.9% 0.003

May '05 -2.65E-15 0.045 16.6% 0.003J un '05 -1.12E-15 0.056 16.3% 0.005J ul '05 -2.59E-15 0.050 14.1% 0.004

Aug '05 -2.16E-15 0.048 13.3% 0.004Sep '05 -3.98E-15 0.054 15.3% 0.005Oct '05 -4.64E-15 0.037 13.1% 0.003

Nov '05 -3.53E-15 0.034 12.4% 0.002Dec '05 -2.45E-15 0.035 12.3% 0.002

Year -2.93E-15 0.044 15.2% 0.003

Net Difference

Net Difference

Mean Scaled kWh Differences BUSNODEMBUSNODEMSCENTSCENT

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Profile and Sample DifferencesProfile and Sample Differences

Day of WeekSun 0.001 0.002 6.1% 5.18E-06Mon -0.002 0.002 6.1% 5.62E-06Tue 0.000 0.002 5.0% 4.22E-06Wed 0.000 0.002 5.2% 4.95E-06Thu -0.001 0.002 5.1% 5.08E-06Fri -0.001 0.002 5.8% 5.62E-06Sat 0.002 0.002 7.6% 9.15E-06

Holiday 0.000 0.001 4.9% 2.70E-06

Month & YearJ an '05 -3.35E-16 0.003 8.8% 1.06E-05Feb '05 -7.19E-16 0.002 5.4% 5.43E-06Mar '05 -4.94E-16 0.002 7.5% 8.84E-06Apr '05 -1.54E-16 0.002 5.5% 5.00E-06

May '05 -3.84E-16 0.002 6.3% 6.10E-06J un '05 -1.12E-16 0.002 5.6% 4.65E-06J ul '05 -1.29E-16 0.002 5.9% 5.21E-06

Aug '05 -1.13E-16 0.001 3.5% 2.44E-06Sep '05 -2.92E-16 0.001 3.8% 2.20E-06Oct '05 -5.50E-16 0.002 4.9% 3.70E-06

Nov '05 -3.55E-16 0.002 5.5% 5.03E-06Dec '05 -1.59E-16 0.002 7.1% 8.25E-06

Year -3.14E-16 0.002 5.8% 5.64E-06

Fraction Difference

Fraction Difference

Average Daily Fraction DifferencesAbs. Fraction Diff Abs. % Fraction Diff RMSE

Abs. Fraction Diff Abs. % Fraction Diff RMSE

BUSNODEMBUSNODEMSCENTSCENT

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July 24, 2006

BUSNODEMBUSNODEMSOUTHSOUTH

Reflecting Prospective 2006 Reflecting Prospective 2006 AV Profile ID ChangesAV Profile ID Changes

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152

Distribution of Sample PrecisionDistribution of Sample Precision

90% Confidence

0

2,000

4,000

6,000

8,000

10,000

12,000

14,000

Percent Accuracy

Inte

rva

l Co

un

t

BUSNODEMBUSNODEMSOUTHSOUTH

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Profile and Sample ComparisonProfile and Sample Comparison

1 Day of lowest total absolute kWh difference for 01/01/05 thru 12/31/05

Comparison for 02/26/05

0.0

0.1

0.2

0.3

0.4

0.5

0.6

0.7

0.8

Interval

kW

h

Sample Profile Lower Confidence Limit Upper Confidence Limit

1

(Saturday)

BUSNODEMBUSNODEMSOUTHSOUTH

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Profile and Sample ComparisonProfile and Sample Comparison

2 Day of 25th percentile total absolute kWh difference for 01/01/05 thru 12/31/05

Comparison for 10/08/05

0.0

0.1

0.2

0.3

0.4

0.5

0.6

0.7

0.8

Interval

kW

h

Sample Profile Lower Confidence Limit Upper Confidence Limit

2

(Saturday)

BUSNODEMBUSNODEMSOUTHSOUTH

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155

Profile and Sample ComparisonProfile and Sample Comparison

3 Day of median total absolute kWh difference for 01/01/05 thru 12/31/05

Comparison for 04/13/05

-0.1

0.0

0.1

0.2

0.3

0.4

0.5

0.6

0.7

0.8

Interval

kW

h

Sample Profile Lower Confidence Limit Upper Confidence Limit

3

(Wednesday)

BUSNODEMBUSNODEMSOUTHSOUTH

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Profile and Sample ComparisonProfile and Sample Comparison

4 Day of 75th percentile total absolute kWh difference for 01/01/05 thru 12/31/05

Comparison for 07/09/05

0.0

0.1

0.2

0.3

0.4

0.5

0.6

0.7

0.8

Interval

kW

h

Sample Profile Lower Confidence Limit Upper Confidence Limit

4

(Saturday)

BUSNODEMBUSNODEMSOUTHSOUTH

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157

Profile and Sample ComparisonProfile and Sample Comparison

5 Day of highest total absolute kWh difference for 01/01/05 thru 12/31/05

Comparison for 09/16/05

0.0

0.1

0.2

0.3

0.4

0.5

0.6

0.7

0.8

Interval

kW

h

Sample Profile Lower Confidence Limit Upper Confidence Limit

5

(Friday)

BUSNODEMBUSNODEMSOUTHSOUTH

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158

Profile and Sample Comparison: Scaled Profile and Sample Comparison: Scaled LRSLRS

5 Day of highest total absolute kWh difference for 01/01/05 thru 12/31/05

Comparison for 09/16/05

0.0

0.1

0.2

0.3

0.4

0.5

0.6

0.7

0.8

Interval

kW

h

Scaled Sample Profile Lower Confidence Limit Upper Confidence Limit

5

(Friday)

BUSNODEMBUSNODEMSOUTHSOUTH

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Profile and Sample ComparisonProfile and Sample Comparison

Monthly kWh

0

200

400

600

800

1,000

1,200

Jan '05 Feb '05 Mar '05 Apr '05 May '05 Jun '05 Jul '05 Aug '05 Sep '05 Oct '05 Nov '05 Dec '05

kW

h

Profile Sample

BUSNODEMBUSNODEMSOUTHSOUTH

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160

Profile and Sample DifferencesProfile and Sample Differences

Distribution of Absolute kWh Differences

0

1,000

2,000

3,000

4,000

5,000

6,000

kWh Range

Inte

rva

l Co

un

t

BUSNODEMBUSNODEMSOUTHSOUTH

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161

Profile and Sample DifferencesProfile and Sample Differences

Statistically Significant Differences

0

10

20

30

40

50

60

70

80

90

100

<= 0.06 0.07 - 0.08 0.09 - 0.10 0.11 - 0.12 0.13 - 0.14 0.15 - 0.16 0.17 - 0.18 0.19 - 0.20 > 0.20

Sample kWh Range

Pe

rce

nt

Unscaled Sample Scaled Sample

BUSNODEMBUSNODEMSOUTHSOUTH

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162

Profile and Sample DifferencesProfile and Sample Differences

Statistically Significant Differences

0

10

20

30

40

50

60

70

80

90

100

Pe

rce

nt

Unscaled Sample Scaled Sample

BUSNODEMBUSNODEMSOUTHSOUTH

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163

Profile and Sample DifferencesProfile and Sample Differences

Median Differences -- Scaled Sample minus Profilefor 01/01/05 thru 12/31/05

-0.4

-0.3

-0.2

-0.1

0.0

0.1

0.2

0.3

0.4

kWh

Median 5th Percentile 95th Percentile

Sun Mon Tue Wed Thu Fri Sat Hol

BUSNODEMBUSNODEMSOUTHSOUTH

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164

Differences for 1Differences for 1stst Quarter 2005 Quarter 2005

Median Differences -- Scaled Sample minus Profile

-0.4

-0.3

-0.2

-0.1

0.0

0.1

0.2

0.3

0.4

kW

h

Median 5th Percentile 95th Percentile

Sun Mon Tue Wed Thu Fri Sat Hol

BUSNODEMBUSNODEMSOUTHSOUTH

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165

Differences for 2Differences for 2ndnd Quarter 2005 Quarter 2005

Median Differences -- Scaled Sample minus Profile

-0.4

-0.3

-0.2

-0.1

0.0

0.1

0.2

0.3

0.4

kW

h

Median 5th Percentile 95th Percentile

Sun Mon Tue Wed Thu Fri Sat Hol

BUSNODEMBUSNODEMSOUTHSOUTH

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166

Differences for 3Differences for 3rdrd Quarter 2005 Quarter 2005

Median Differences -- Scaled Sample minus Profile

-0.4

-0.3

-0.2

-0.1

0.0

0.1

0.2

0.3

0.4

kW

h

Median 5th Percentile 95th Percentile

Sun Mon Tue Wed Thu Fri Sat Hol

BUSNODEMBUSNODEMSOUTHSOUTH

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167

Differences for 4Differences for 4thth Quarter 2005 Quarter 2005

Median Differences -- Scaled Sample minus Profile

-0.4

-0.3

-0.2

-0.1

0.0

0.1

0.2

0.3

0.4

kW

h

Median 5th Percentile 95th Percentile

Sun Mon Tue Wed Thu Fri Sat Hol

BUSNODEMBUSNODEMSOUTHSOUTH

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168

Profile and Unscaled Sample DifferencesProfile and Unscaled Sample Differences

(Unscaled Sample minus Profile) vs. Profile for 01/01/05 thru 12/31/05

-450

-400

-350

-300

-250

-200

-150

-100

-50

0

0.0 0.1 0.2 0.3 0.4 0.5

Profile Interval kWh

Pe

rce

nt

Dif

fere

nc

e

Median 5th Percentile 95th Percentile Regression on Profile kWh

BUSNODEMBUSNODEMSOUTHSOUTH

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169

Profile and Scaled Sample DifferencesProfile and Scaled Sample Differences

(Scaled Sample minus Profile) vs. Profile for 01/01/05 thru 12/31/05

-120

-100

-80

-60

-40

-20

0

20

40

60

80

100

0.0 0.1 0.2 0.3 0.4 0.5

Profile Interval kWh

Pe

rce

nt

Dif

fere

nc

e

Median 5th Percentile 95th Percentile Regression on Profile kWh

BUSNODEMBUSNODEMSOUTHSOUTH

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Profile and Sample DifferencesProfile and Sample Differences

Distribution of kWh Percent Differences[(sample - profile) / sample]

0

2,000

4,000

6,000

8,000

10,000

12,000

14,000

16,000

18,000

20,000

Percent Difference

Inte

rva

l Co

un

t

Unscaled Sample Scaled Sample

BUSNODEMBUSNODEMSOUTHSOUTH

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Profile and Sample DifferencesProfile and Sample Differences

J an '05 40.0% 71.5%Feb '05 36.1% 73.3%Mar '05 28.4% 72.4%Apr '05 34.8% 73.2%

May '05 38.0% 73.4%J un '05 38.5% 80.1%J ul '05 41.5% 75.4%

Aug '05 37.7% 78.4%Sep '05 25.1% 76.0%Oct '05 24.1% 69.4%

Nov '05 38.8% 69.2%Dec '05 25.6% 66.2%

Year 21.5% 65.0%

ProfileLRSLoad Factor

BUSNODEMBUSNODEMSOUTHSOUTH

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Profile and Sample DifferencesProfile and Sample Differences

J an '05 266 280 521 508 51.1% 55.1%Feb '05 226 245 484 464 46.6% 52.8%Mar '05 294 307 482 469 61.1% 65.3%Apr '05 286 281 514 520 55.7% 54.0%

May '05 328 306 545 567 60.2% 54.0%J un '05 432 398 560 594 77.2% 66.9%J ul '05 358 335 674 697 53.1% 48.1%

Aug '05 488 442 586 631 83.3% 70.1%Sep '05 473 364 533 643 88.6% 56.6%Oct '05 395 311 472 557 83.5% 55.8%

Nov '05 305 285 472 492 64.7% 57.9%Dec '05 262 257 527 531 49.7% 48.5%

Year 4,113 3,810 6,369 6,673 64.6% 57.1%

Note: On-Peak is 7 a.m. to 10 p.m., non-holiday weekdays.

On-Peak and Off-Peak kWh

Profile LRS ProfileLRS Profile LRS

On-Peak / Off-PeakOn-Peak kWh Off-Peak kWh

BUSNODEMBUSNODEMSOUTHSOUTH

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Profile and Sample DifferencesProfile and Sample Differences

LRS ProfileJ an '05 7.2% 7.5%Feb '05 7.5% 6.8%Mar '05 7.1% 7.4%Apr '05 7.6% 7.6%

May '05 8.3% 8.3%J un '05 9.5% 9.5%J ul '05 9.6% 9.8%

Aug '05 9.5% 10.2%Sep '05 9.4% 9.6%Oct '05 8.3% 8.3%

Nov '05 7.6% 7.4%Dec '05 8.5% 7.5%

Monthly kWh as a Percentage of the Year

BUSNODEMBUSNODEMSOUTHSOUTH

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Profile and Sample DifferencesProfile and Sample Differences

Day of Week Absolute Diff Absolute % Diff RMSESun -0.018 0.046 20.8% 0.004Mon 0.002 0.073 23.3% 0.014Tue 0.014 0.075 22.2% 0.016Wed 0.019 0.084 23.9% 0.019Thu -0.009 0.061 21.7% 0.006Fri -0.007 0.064 22.8% 0.007Sat -0.002 0.057 21.4% 0.006

Holiday 0.001 0.054 22.0% 0.005

Month & Year Absolute Diff Absolute % Diff RMSEJ an '05 -2.78E-15 0.057 22.9% 0.006Feb '05 -2.17E-15 0.060 24.5% 0.006Mar '05 -3.30E-15 0.045 18.6% 0.004Apr '05 -3.57E-15 0.045 16.6% 0.004

May '05 3.11E-15 0.048 17.2% 0.004J un '05 6.69E-16 0.067 20.2% 0.008J ul '05 1.43E-15 0.059 17.1% 0.007

Aug '05 1.25E-16 0.065 18.4% 0.007Sep '05 2.66E-16 0.112 31.2% 0.034Oct '05 -1.60E-15 0.098 31.7% 0.024

Nov '05 -2.92E-15 0.071 27.1% 0.011Dec '05 -2.87E-15 0.058 22.2% 0.006

Year -1.12E-15 0.065 22.3% 0.010

Net Difference

Net Difference

Mean Scaled kWh Differences BUSNODEMBUSNODEMSOUTHSOUTH

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Profile and Sample DifferencesProfile and Sample Differences

Day of WeekSun -0.002 0.003 12.8% 1.59E-05Mon 0.000 0.003 8.6% 1.42E-05Tue 0.001 0.003 8.4% 1.63E-05Wed 0.002 0.004 10.4% 3.17E-05Thu -0.001 0.003 8.7% 1.42E-05Fri -0.001 0.003 9.6% 1.91E-05Sat 0.000 0.004 11.3% 2.48E-05

Holiday 0.000 0.003 10.4% 1.39E-05

Month & YearJ an '05 -3.09E-16 0.003 10.1% 1.98E-05Feb '05 -2.26E-16 0.005 12.4% 3.20E-05Mar '05 -4.78E-16 0.002 5.4% 5.28E-06Apr '05 -3.75E-16 0.001 4.5% 3.04E-06

May '05 3.64E-16 0.001 4.2% 2.85E-06J un '05 6.65E-17 0.002 7.2% 7.61E-06J ul '05 4.51E-16 0.002 6.2% 5.89E-06

Aug '05 4.79E-17 0.002 7.1% 8.86E-06Sep '05 -8.99E-17 0.006 18.4% 4.95E-05Oct '05 -1.65E-16 0.006 18.7% 4.31E-05

Nov '05 -3.44E-16 0.005 14.9% 3.75E-05Dec '05 -2.79E-16 0.004 11.3% 1.96E-05

Year -1.10E-16 0.003 10.0% 1.94E-05

Fraction Difference

Fraction Difference

Average Daily Fraction DifferencesAbs. Fraction Diff Abs. % Fraction Diff RMSE

Abs. Fraction Diff Abs. % Fraction Diff RMSE

BUSNODEMBUSNODEMSOUTHSOUTH

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ERCOTERCOTLoad Research Sample to Load Research Sample to Profile Comparison Profile Comparison

July 24, 2006

BUSNODEMBUSNODEMWESTWEST

Reflecting Prospective 2006 Reflecting Prospective 2006 AV Profile ID ChangesAV Profile ID Changes

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Distribution of Sample PrecisionDistribution of Sample Precision

90% Confidence

0

500

1,000

1,500

2,000

2,500

3,000

3,500

4,000

4,500

Percent Accuracy

Inte

rva

l Co

un

t

BUSNODEMBUSNODEMWESTWEST

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Profile and Sample ComparisonProfile and Sample Comparison

1 Day of lowest total absolute kWh difference for 01/01/05 thru 12/31/05

Comparison for 03/13/05

0.0

0.1

0.2

0.3

0.4

0.5

0.6

0.7

0.8

Interval

kW

h

Sample Profile Lower Confidence Limit Upper Confidence Limit

1

(Sunday)

BUSNODEMBUSNODEMWESTWEST

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Profile and Sample ComparisonProfile and Sample Comparison

2 Day of 25th percentile total absolute kWh difference for 01/01/05 thru 12/31/05

Comparison for 08/06/05

0.0

0.1

0.2

0.3

0.4

0.5

0.6

0.7

0.8

Interval

kW

h

Sample Profile Lower Confidence Limit Upper Confidence Limit

2

(Saturday)

BUSNODEMBUSNODEMWESTWEST

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Profile and Sample ComparisonProfile and Sample Comparison

3 Day of median total absolute kWh difference for 01/01/05 thru 12/31/05

Comparison for 01/21/05

0.0

0.1

0.2

0.3

0.4

0.5

0.6

0.7

0.8

Interval

kW

h

Sample Profile Lower Confidence Limit Upper Confidence Limit

3

(Friday)

BUSNODEMBUSNODEMWESTWEST

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Profile and Sample ComparisonProfile and Sample Comparison

4 Day of 75th percentile total absolute kWh difference for 01/01/05 thru 12/31/05

Comparison for 09/07/05

0.0

0.1

0.2

0.3

0.4

0.5

0.6

0.7

0.8

Interval

kW

h

Sample Profile Lower Confidence Limit Upper Confidence Limit

4

(Wednesday)

BUSNODEMBUSNODEMWESTWEST

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Profile and Sample ComparisonProfile and Sample Comparison

5 Day of highest total absolute kWh difference for 01/01/05 thru 12/31/05

Comparison for 07/01/05

0.0

0.1

0.2

0.3

0.4

0.5

0.6

0.7

0.8

Interval

kW

h

Sample Profile Lower Confidence Limit Upper Confidence Limit

5

(Friday)

BUSNODEMBUSNODEMWESTWEST

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183

Profile and Sample Comparison: Scaled Profile and Sample Comparison: Scaled LRSLRS

5 Day of highest total absolute kWh difference for 01/01/05 thru 12/31/05

Comparison for 07/01/05

0.0

0.1

0.2

0.3

0.4

0.5

0.6

0.7

0.8

Interval

kW

h

Scaled Sample Profile Lower Confidence Limit Upper Confidence Limit

5

(Friday)

BUSNODEMBUSNODEMWESTWEST

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Profile and Sample ComparisonProfile and Sample Comparison

Monthly kWh

0

200

400

600

800

1,000

1,200

Jan '05 Feb '05 Mar '05 Apr '05 May '05 Jun '05 Jul '05 Aug '05 Sep '05 Oct '05 Nov '05 Dec '05

kW

h

Profile Sample

BUSNODEMBUSNODEMWESTWEST

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Profile and Sample DifferencesProfile and Sample Differences

Distribution of Absolute kWh Differences

0

1,000

2,000

3,000

4,000

5,000

6,000

7,000

kWh Range

Inte

rva

l Co

un

t

BUSNODEMBUSNODEMWESTWEST

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186

Profile and Sample DifferencesProfile and Sample Differences

Statistically Significant Differences

0

10

20

30

40

50

60

70

80

90

100

<= 0.06 0.07 - 0.08 0.09 - 0.10 0.11 - 0.12 0.13 - 0.14 0.15 - 0.16 0.17 - 0.18 0.19 - 0.20 > 0.20

Sample kWh Range

Pe

rce

nt

Unscaled Sample Scaled Sample

BUSNODEMBUSNODEMWESTWEST

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Profile and Sample DifferencesProfile and Sample Differences

Statistically Significant Differences

0

10

20

30

40

50

60

70

80

90

100

Pe

rce

nt

Unscaled Sample Scaled Sample

BUSNODEMBUSNODEMWESTWEST

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Profile and Sample DifferencesProfile and Sample Differences

Median Differences -- Scaled Sample minus Profilefor 01/01/05 thru 12/31/05

-0.4

-0.3

-0.2

-0.1

0.0

0.1

0.2

0.3

0.4

kWh

Median 5th Percentile 95th Percentile

Sun Mon Tue Wed Thu Fri Sat Hol

BUSNODEMBUSNODEMWESTWEST

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189

Differences for 1Differences for 1stst Quarter 2005 Quarter 2005

Median Differences -- Scaled Sample minus Profile

-0.4

-0.3

-0.2

-0.1

0.0

0.1

0.2

0.3

0.4

kW

h

Median 5th Percentile 95th Percentile

Sun Mon Tue Wed Thu Fri Sat Hol

BUSNODEMBUSNODEMWESTWEST

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190

Differences for 2Differences for 2ndnd Quarter 2005 Quarter 2005

Median Differences -- Scaled Sample minus Profile

-0.4

-0.3

-0.2

-0.1

0.0

0.1

0.2

0.3

0.4

kW

h

Median 5th Percentile 95th Percentile

Sun Mon Tue Wed Thu Fri Sat Hol

BUSNODEMBUSNODEMWESTWEST

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191

Differences for 3Differences for 3rdrd Quarter 2005 Quarter 2005

Median Differences -- Scaled Sample minus Profile

-0.4

-0.3

-0.2

-0.1

0.0

0.1

0.2

0.3

0.4

kW

h

Median 5th Percentile 95th Percentile

Sun Mon Tue Wed Thu Fri Sat Hol

BUSNODEMBUSNODEMWESTWEST

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Differences for 4Differences for 4thth Quarter 2005 Quarter 2005

Median Differences -- Scaled Sample minus Profile

-0.4

-0.3

-0.2

-0.1

0.0

0.1

0.2

0.3

0.4

kW

h

Median 5th Percentile 95th Percentile

Sun Mon Tue Wed Thu Fri Sat Hol

BUSNODEMBUSNODEMWESTWEST

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193

Profile and Unscaled Sample DifferencesProfile and Unscaled Sample Differences

(Unscaled Sample minus Profile) vs. Profile for 01/01/05 thru 12/31/05

-600

-500

-400

-300

-200

-100

0

0.0 0.1 0.2 0.3 0.4 0.5 0.6 0.7

Profile Interval kWh

Pe

rce

nt

Dif

fere

nc

e

Median 5th Percentile 95th Percentile Regression on Profile kWh

BUSNODEMBUSNODEMWESTWEST

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194

Profile and Scaled Sample DifferencesProfile and Scaled Sample Differences

(Scaled Sample minus Profile) vs. Profile for 01/01/05 thru 12/31/05

-120

-100

-80

-60

-40

-20

0

20

40

60

80

100

0.0 0.1 0.2 0.3 0.4 0.5 0.6 0.7

Profile Interval kWh

Pe

rce

nt

Dif

fere

nc

e

Median 5th Percentile 95th Percentile Regression on Profile kWh

BUSNODEMBUSNODEMWESTWEST

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Profile and Sample DifferencesProfile and Sample Differences

Distribution of kWh Percent Differences[(sample - profile) / sample]

0

1,000

2,000

3,000

4,000

5,000

6,000

7,000

8,000

9,000

10,000

Percent Difference

Inte

rva

l Co

un

t

Unscaled Sample Scaled Sample

BUSNODEMBUSNODEMWESTWEST

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Profile and Sample DifferencesProfile and Sample Differences

J an '05 57.4% 52.0%Feb '05 52.7% 55.3%Mar '05 47.2% 57.8%Apr '05 57.0% 57.5%

May '05 58.2% 54.8%J un '05 62.4% 59.4%J ul '05 58.7% 61.0%

Aug '05 59.1% 63.0%Sep '05 56.0% 57.5%Oct '05 55.5% 60.9%

Nov '05 46.2% 54.4%Dec '05 48.9% 46.3%

Year 45.0% 45.1%

ProfileLRSLoad Factor

BUSNODEMBUSNODEMWESTWEST

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Profile and Sample DifferencesProfile and Sample Differences

J an '05 282 334 555 502 50.8% 66.4%Feb '05 244 294 499 449 48.8% 65.5%Mar '05 273 343 484 413 56.3% 83.0%Apr '05 237 286 474 425 49.9% 67.3%

May '05 265 323 518 459 51.0% 70.4%J un '05 344 411 563 495 61.0% 83.1%J ul '05 287 352 675 610 42.4% 57.7%

Aug '05 357 427 581 510 61.5% 83.7%Sep '05 306 380 604 531 50.6% 71.5%Oct '05 265 325 514 454 51.6% 71.4%

Nov '05 255 324 497 428 51.4% 75.8%Dec '05 256 332 612 537 41.9% 61.8%

Year 3,369 4,131 6,576 5,814 51.2% 71.1%

Note: On-Peak is 7 a.m. to 10 p.m., non-holiday weekdays.

On-Peak and Off-Peak kWh

Profile LRS ProfileLRS Profile LRS

On-Peak / Off-PeakOn-Peak kWh Off-Peak kWh

BUSNODEMBUSNODEMWESTWEST

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Profile and Sample DifferencesProfile and Sample Differences

LRS ProfileJ an '05 8.3% 8.4%Feb '05 7.7% 7.5%Mar '05 7.1% 7.6%Apr '05 6.9% 7.2%

May '05 8.0% 7.9%J un '05 9.2% 9.1%J ul '05 10.1% 9.7%

Aug '05 9.3% 9.4%Sep '05 9.5% 9.2%Oct '05 7.6% 7.8%

Nov '05 7.4% 7.6%Dec '05 8.9% 8.7%

Monthly kWh as a Percentage of the Year

BUSNODEMBUSNODEMWESTWEST

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Profile and Sample DifferencesProfile and Sample Differences

Day of Week Absolute Diff Absolute % Diff RMSESun 0.027 0.068 27.9% 0.006Mon -0.005 0.094 35.1% 0.011Tue -0.005 0.092 33.8% 0.011Wed -0.008 0.094 35.0% 0.011Thu -0.009 0.096 36.3% 0.012Fri -0.016 0.105 41.5% 0.014Sat 0.012 0.079 32.6% 0.008

Holiday 0.023 0.087 37.3% 0.009

Month & Year Absolute Diff Absolute % Diff RMSEJ an '05 2.75E-15 0.091 36.0% 0.011Feb '05 4.18E-15 0.085 33.0% 0.010Mar '05 7.17E-15 0.087 37.2% 0.010Apr '05 4.65E-15 0.081 35.3% 0.008

May '05 2.84E-15 0.073 29.7% 0.007J un '05 8.96E-16 0.093 30.7% 0.011J ul '05 -1.70E-15 0.089 28.5% 0.011

Aug '05 3.44E-16 0.090 29.5% 0.010Sep '05 3.16E-15 0.092 30.5% 0.011Oct '05 8.09E-15 0.085 36.7% 0.009

Nov '05 4.63E-15 0.094 41.6% 0.011Dec '05 2.53E-15 0.115 46.7% 0.017

Year 3.29E-15 0.090 34.6% 0.010

Net Difference

Net Difference

Mean Scaled kWh Differences BUSNODEMBUSNODEMWESTWEST

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Profile and Sample DifferencesProfile and Sample Differences

Day of WeekSun 0.003 0.003 10.1% 1.63E-05Mon -0.001 0.002 5.3% 4.63E-06Tue -0.001 0.002 5.1% 5.74E-06Wed -0.001 0.002 5.7% 6.00E-06Thu -0.001 0.002 6.4% 7.41E-06Fri -0.002 0.002 7.6% 7.88E-06Sat 0.001 0.002 7.1% 9.94E-06

Holiday 0.003 0.003 8.9% 8.08E-06

Month & YearJ an '05 2.81E-16 0.002 6.3% 7.32E-06Feb '05 5.06E-16 0.004 10.6% 2.02E-05Mar '05 9.47E-16 0.003 9.6% 1.39E-05Apr '05 5.91E-16 0.002 4.7% 4.12E-06

May '05 5.04E-16 0.002 5.7% 4.43E-06J un '05 1.77E-16 0.002 5.1% 3.99E-06J ul '05 -1.79E-16 0.002 7.0% 1.02E-05

Aug '05 1.46E-16 0.002 6.3% 5.74E-06Sep '05 3.98E-16 0.002 7.0% 8.15E-06Oct '05 9.31E-16 0.002 5.7% 7.07E-06

Nov '05 5.64E-16 0.002 6.6% 6.64E-06Dec '05 2.95E-16 0.002 7.3% 8.58E-06

Year 4.29E-16 0.002 6.8% 8.30E-06

Fraction Difference

Fraction Difference

Average Daily Fraction DifferencesAbs. Fraction Diff Abs. % Fraction Diff RMSE

Abs. Fraction Diff Abs. % Fraction Diff RMSE

BUSNODEMBUSNODEMWESTWEST