Tonga Power Reliability Indicators

Review Results and Recommendations

Pauline Muscat

Consultant

October 2013

Objective

Review historical outage data and

develop suitable reliability indicator targets

MethodologyReview last 12 months outage data Investigate and evaluate data measurement, collection and

analysis processes, to identify any issuesWide consultation with staff at all levels Review reporting calculations and functionsData set refinement as requiredConduct training for Fault Operator, Fault Repair and

Generation staff, in accurate data collection and purpose in company performance

Analysed dataDeveloped targetsRecommendations

Issues - Technical

Calculation for indicators was using LVNumber of customers in network has grown, needed updateDate/time anomaly in FileMaker resulting in escalated resultsIncomplete outage records; no finish time, customers affectedIncorrect outage records; HV outage, no of customers = 0 etc,

incorrect Fault type selectedDiscrepancies between Generation and Distribution recordsIncomplete table of number of customers on each transformer

Issues – Non-technical

Lack of team work across departments;

Departments focused only on their own functions Lack of understanding of importance of accurate

data collection amongst staffImprovement observed in Fault Operator entries

over past months, not recognised or rewardedDespondent fault entry staff due to feeling they

had been kept as trainees for too long (over 18 mths)

Lack of training for Fault Response staff

Data Validation Removed LV outages from SAIDI, SAIFI calculation Corrected for duration anomaly Updated number of customers in network (to 15,432) Completed records that had been left incomplete Reviewed suspect or invalid records, especially

customers affected Cross checked data against Generation log book Validated average outage durations by expert review Checked against reported results in other Pacific utilities

Resulted in overall 20% reduction in reported SAIDI.

Data Analysis

Compared old data and adjusted/corrected data and predicted SAIDI improvement 20% by addressing issues with data

Actual improvement after corrections was 20% Reviewed Data for SAIDI,SAIFI,CAIDI;

cumulative yearly and mthly Reviewed breakdown of indicators between Gen and HV Reviewed outages for Gen and HV

Results

SAIDI Outages SAIFI CAIDI

Data Correction

Jul-12 Aug-12 Sep-12 Oct-12 Nov-12 Dec-12 Jan-13 Feb-13 Mar-13 Apr-13 May-13 Jun-13 Jul-13 Aug-13 Sep-13 Total Last 12 mths

0

200

400

600

800

1000

1200

1400

1600

Cumulative SAIDI Old versus New; FY 2012/13

SAIDI Cumulative Old Data SAIDI Cumulative New Data

1138 min/cust/yr

1423 min/cust/yr

SAIDI

May-12 Jul-12 Aug-12 Oct-12 Dec-12 Jan-13 Mar-13 May-13 Jun-13 Aug-13 Oct-130

50

100

150

200

250

300

350

400

Monthly SAIDI: Old versus New

SAIDI: Old SAIDI: HV and Gen

Jul-12 Aug-12 Sep-12 Oct-12 Nov-12 Dec-12 Jan-13 Feb-13 Mar-13 Apr-13 May-13 Jun-13 Jul-13 Aug-13 Sep-130

50

100

150

200

250

Total Monthly SAIDI: Generation and HV

Gen Total HV Total

Jul-12 Sep-12 Nov-12 Jan-13 Mar-13 May-13 Jul-13 Sep-130

50

100

150

200

250

Total Monthly SAIDI: Generation and HV

Gen Total HV Total New Av per Mth

Av: 91.0 min/cust/mth

Jul-12 Aug-12 Sep-12 Oct-12 Nov-12 Dec-12 Jan-13 Feb-13 Mar-13 Apr-13 May-13 Jun-13 Jul-13 Aug-13 Sep-130

20

40

60

80

100

120

140

160

180Monthly SAIDI: Generation and HV

Gen Total HV Total Av Gen SAIDI Av HV SAIDI

HV Av: 40.6 min/cust

Gen Av: 50.4 min/cust

55%45%

1 2 3 4 5 6 7 8 9 10 11 12 13 14 150

10

20

30

40

50

60

70

Average Outages per Month: Gen and HV

Gen outages HV outages Total Av OutagesHV Av Outages Gen Av Outages

Total Av: 27.4 outages / mth

Gen Av: 2.9 outages / mth

HV Av: 22.6 outages / mth

12%

88%

Gen

HV

Jul-12 Aug-12 Sep-12 Oct-12 Nov-12 Dec-12 Jan-13 Feb-13 Mar-13 Apr-13 May-13 Jun-130

5

10

15

20

25

Cumulative SAIFI Old versus New; FY 2012/13

Cumulative Old Data Cumulative New Data

23.78 int/cust/yr

14.70 int/cust/yr

May-12 Jul-12 Aug-12 Oct-12 Dec-12 Jan-13 Mar-13 May-13 Jun-13 Aug-13 Oct-130

1

2

3

4

5

6

7

8

Monthly SAIFI: Old versus New

SAIFI: Old

Jul-1

2

Aug-12

Sep-1

2

Oct

-12

Nov

-12

Dec

-12

Jan-1

3

Feb-1

3

Mar

-13

Apr-13

May

-13

Jun-1

3

Jul-1

3

Aug-13

Sep-1

30.0

0.5

1.0

1.5

2.0

2.5

3.0

Total Monthly SAIFI: Generation and HV

Gen Total HV Total

61%

39%

HV Gen

61%

39%

HV Gen

Jul-12 Aug-12 Sep-12 Oct-12 Nov-12 Dec-12 Jan-13 Feb-13 Mar-13 Apr-13 May-13 Jun-13 Jul-13 Aug-13 Sep-130.0

0.5

1.0

1.5

2.0

2.5

3.0

Total Monthly SAIFI: Generation and HV

Gen Total HV Total New Av per Mth

Av:1.2 interruptions/cust/mth

61%

39%

HV Gen

HV Gen

61%

39%

HV Gen

Jul-12 Aug-12 Sep-12 Oct-12 Nov-12 Dec-12 Jan-13 Feb-13 Mar-13 Apr-13 May-13 Jun-13 Jul-13 Aug-13 Sep-130.00

0.50

1.00

1.50

2.00

2.50

3.00

Total Monthly SAIFI: Generation and HV

Gen Total HV Total Av Gen SAIFI Av HV SAIFI

Gen Av: 0.76 int/cust/mth HV Av: 0.43 int/cust/mth

Jul-12 Aug-12 Sep-12 Oct-12 Nov-12 Dec-12 Jan-13 Feb-13 Mar-13 Apr-13 May-13 Jun-130

200

400

600

800

1000

1200

1400

Cumulative CAIDI Old versus New; FY 2012/13

Cumulative Old Data Cumulative New Data

918min

1273 min

Jul-12 Sep-12 Nov-12 Jan-13 Mar-13 May-13 Jul-13 Sep-130

50

100

150

200

250

Total Monthly CAIDI: Generation and HV

Gen Total HV Total New Av per Mth

79.2 min/mth

Targets

1 Common KPI Target for all to work together to achieve Target: 5% Improvement on SAIDI, SAIFI, CAIDI Company wide communication and involvement and

reward Yearly Goal, Reported and Calculated Monthly Excludes extreme weather events Continued improved data recording and reporting

Jul-12 Oct-12 Jan-13 Apr-13 Jul-130

50

100

150

200

250

Monthly SAIDI: Generation and HVTarget

Gen Total HV TotalNew Av per Mth 5% Improvement

Av 91.0 min/cust/mthTarget: 86.5 min/cust/mth

Jul-1

2

Aug-1

2

Sep-

12

Oct-1

2

Nov-1

2

Dec-1

2

Jan-

13

Feb-

13

Mar

-13

Apr-1

3

May

-13

Jun-

13

Jul-1

3

Aug-1

3

Sep-

13

Tota

l Las

t 12

mth

s0

200

400

600

800

1000

1200

Cumulative SAIDI: FY 2012/13, Target 2013/14

SAIDI Cumulative New DataCumulativeCumulative

Target: 1082 min/cust/yr

Total: 1138 min/cust/yr

Target: 1082 m/cust/yrTotal: 1138 m/cust/yr

Jul-1

2

Aug-1

2

Sep-

12

Oct-1

2

Nov-1

2

Dec-1

2

Jan-

13

Feb-

13

Mar

-13

Apr-1

3

May

-13

Jun-

130

2

4

6

8

10

12

14

16

Cumulative SAIFI: FY 2012/13, Target 2013/14

Cumulative New Data CumulativeTarget

Jul-12 Sep-12 Nov-12 Jan-13 Mar-13 May-13 Jul-13 Sep-130.0

0.5

1.0

1.5

2.0

2.5

3.0

Monthly SAIFI: Generation and HVTarget

Gen Total HV TotalNew Av per Mth 5% Improvement

Av 1.2 int/cust/mthTarget: 1.1 int/cust/mth

Total 15 interruptions/cust/mth

Target: 14 int/cust/mth

Jul-12 Sep-12 Nov-12 Jan-13 Mar-13 May-13 Jul-13 Sep-130

50

100

150

200

250

Total Monthly CAIDI: Generation and HV

Target

Gen Total HV TotalNew Av per Mth 5% Improvement

Av 79.2 min/mth

Target: 75.3 min/mth

Jul-1

2

Aug-1

2

Sep-

12

Oct-1

2

Nov-1

2

Dec-1

2

Jan-

13

Feb-

13

Mar

-13

Apr-1

3

May

-13

Jun-

130

100

200

300

400

500

600

700

800

900

1000

Cumulative CAIDI: FY 2012/13Target 2013/14

Cumulative New Data CumulativeTarget

Total 918 min

Target: 826 min

PPA Benchmarking SAIDI

Any Questions?

PPA Benchmarking SAIDI

Any Questions?

PPA Benchmarking SAIDI

PPA Benchmarking SAIFI

PPA Benchmarking SAIFI

PPA Benchmarking SAIFI

Recommendations

Extend work to cover outer islands. Reliability indicators will likely improve by incorporating more customers.

Analyse fault response times and LV outages and develop targets

Unify all Tonga Power workers by setting a common set of KPI targets (eg SAIDI, SAIFI, CAIDI), with bonus payments for achieving targets.

Company wide communication and involvement and reward will instill ownership and encourage co-operation and support across department.

Continued improvement in data measurement, collection and analysis

Reinforce and continue training