houston area constraint mitigation: phase ii and tnp- bell county project
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HOUSTON AREA CONSTRAINT MITIGATION: PHASE II and
TNP- BELL COUNTY PROJECT
Robert Lona, P.E.&
Don Le ERCOT System Planning
RPG 04/13/2007 Houston Area Constraint Phase II
CNP PROJECT JUSTIFICATION
• CONCERNS ABOUT FUTURE NORTH – HOUSTON IMPORT CONSTRAINTS AFTER HACM PHASE 1(HILLJE SUB)
• CONCERNS ON ADDITIONAL CONGESTION ON TOMBAL 345KV AUTOS
RPG 04/13/2007 Houston Area Constraint Phase II
CNP PROPOSED OPTIONS
• INCREASE N – H IMPORTS - SINGLETON OPTIONS 1-4 - SINGLETON OPTION 5(SUB)• RELIEVE TOMBALL 345KV AUTO CONGESTION - OPTION A(HARDIN SUB) - OPTION B1(ROTHWOOD SUB) - OPTION B2 (ROTHWOOD SUB) - OPTION C (HUMBLE SUB)
NOTE: AFTER INITIAL STUDIES, SINGLETON OPTIONS #1 - #3 WERE NOT EVALUATED FURTHER, DUE TO LACK OF INCREASED IMPORT CAPABILITY FOR NORTH TO HOUSTON
POWER TRANSFERS
RPG 04/13/2007 Houston Area Constraint Phase II
SO4 vs SO5 PRODUCTION COST SAVING COMPARISONS
-$4.00
-$3.00
-$2.00
-$1.00
$0.00
$1.00
$2.00
$3.00
$4.00
$5.00
$6.00
$7.00
$8.00
$9.00
$10.00
$11.00
$12.00
$13.00
$14.00
$15.00
$16.00
2009 2010 2011 2009 2010 2011
PR
OD
UC
TIO
N C
OS
T S
AV
ING
S -
$M
S S_SC S_OG S_SC_OG
SO4 SO5
$0.24 M
$ 3.28 M
S=Sandow 5SC=Sandy Creek 1OG=Oak Grove 1&2
RPG 04/13/2007 Houston Area Constraint Phase II
EFFECT OF SINGLETON PROJECTS ON TOMBAL 345KV AUTO CONGESTION
$0
$1,000,000
$2,000,000
$3,000,000
$4,000,000
$5,000,000
$6,000,000
$7,000,000
$8,000,000
$9,000,000
$10,000,000
$11,000,000
$12,000,000
2010 2011 2010 2011 2010 2011 2010 2011 2010 2011 2010 2011 2010 2011 2010 2011
MA
RG
INA
L C
ON
GE
STI
ON
CO
ST
NOTE: NO CONGESTION IN BASE CASE ACROSS ALL GEN SCENARIOS
SO4 CONFIGURATION SO5 CONFIGURATION
S_GEN S_SC_GEN S_OG_GEN S_SC_OG_GEN S_GEN S_SC_GEN S_OG_GEN
S_SC_OG_GEN
S=Sandow 5SC=Sandy Creek 1OG=Oak Grove 1&2
RPG 04/13/2007 Houston Area Constraint Phase II
East Bell County – TNP One 345KV DB CKTUPGRADE RATTLESNAKE – LAKE CRK 345KV
UPGRADE TEMPLE – SALADO 345KV TO 3200A UPGRADE TNP ONE – TWIN
OAK 345KV DOUBLE CKT.
UPGRADE TEMPLE – BOGGY CREEK 138KV TO 1146A
SANDY CREEK GEN
OAK GROVE GEN
SANDOW GEN
TWIN OAK 3 GEN
RPG 04/13/2007 Houston Area Constraint Phase II
PROPOSED EAST BELL COUNTY – TNP ONE PROJECT
• PROPOSED IN-SERVICE PEAK 2011
PROPOSED UPGRADE COST
NEW TNP ONE-BELL COUNTY 40 MILE 345 kV DBCKT - 2700A $ 48,580,000
EAST BELL COUNTY 345 kV SUB $ 1,048,000
THREE 345 kV BREAKERS @ TNP ONE SUB $ 3,205,000
RECONDUCTOR TEMPLE - SALADO 345 kV DBCKT TO 3200A $ 6,713,000
UPGRADE TEMPLE - BOGGY CREEK 138 kV CKT TO 1146A $ 350,000
TOTAL COST $ 69,337,000
RPG 04/13/2007 Houston Area Constraint Phase II
PRODUCTION COST SAVINGS (PCS) OF EAST BELL COUNTY - TNP ONE PROJECT WITHOUT SINGLETON SUBSTATION IN BASECASE
6.06
13.74 13.36
33.54
6.78
11.93
27.35
52.48
0.00
10.00
20.00
30.00
40.00
50.00
60.00
BASECASE TWIN OAKS 3 OAK GROVE 1 OAK GROVE1&2
SANDY CREEK SANDY CREEK+ TWIN OAKS 3
SANDY CREEK+ OAK GROVE
1&2
SANDY CREEK+ OAK GROVE
1&2 + TWINOAKS 3
GENERATION SCENARIO
PC
S (
$M)
MIN PCS NEEDED: $11.56 M2011
RPG 04/13/2007 Houston Area Constraint Phase II
PRODUCTION COST SAVINGS (PCS) OF EAST BELL COUNTY-TNP ONE 345 Kv LINE WITH SINGLETON SUBSTATION IN BASE CASE
11.29
14.27
22.89
6.00
10.04
21.61
34.04
-5.00
-10.00
-5.00
0.00
5.00
10.00
15.00
20.00
25.00
30.00
35.00
40.00
BASE CASE TWIN OAKS 3 OAK GROVE 1 OAK GROVE1&2
SANDY CREEK SANDY CREEK+ TWIN OAKS
3
SANDY CREEK+ OAK GROVE
1&2
SANDY CREEK+ OAK GROVE
1&2 + TWINOAKS 3
GENERATION SCENARIO
PC
S (
$M)
MIN PCS NEEDED: $10.38 M
2011
RPG 04/13/2007 Houston Area Constraint Phase II
PRODUCTION COST SAVINGS (PCS) OF EAST BELL COUNTY-TNP ONE PROJECT WITH SINGLETON SUBSTATION IN BASE CASE
-5.12
11.73
14.45
22.99
5.43
9.92
23.58
38.98
-10.00
0.00
10.00
20.00
30.00
40.00
50.00
BASECASE TWIN OAKS 3 OAK GROVE 1 OAK GROVE1&2
SANDY CREEK SANDY CREEK+ TWIN OAKS
3
SANDY CREEK+ OAK GROVE
1&2
SANDY CREEK+ OAK GROVE
1&2 + TWINOAKS 3
GENERATION SCENARIO
PC
S (
$M)
MIN PCS NEEDED: $11.56 M
2011
RPG 04/13/2007 Houston Area Constraint Phase II
PROPOSED OPTIONS TO REDUCE TOMBALL 345KV AUTO
CONGESTION
RPG 04/13/2007 Houston Area Constraint Phase II
2011 TNPBC_SO5S_SC_OG PROPOSED OPTIONS
-$6.00
-$5.00
-$4.00
-$3.00
-$2.00
-$1.00
$0.00
$1.00
$2.00
$3.00
$4.00
$5.00
$6.00
ROTHWOOD B1 ROTHWOOD B2 HARDIN A HUMBLE C
PR
OD
UC
TIO
N C
OS
T S
AV
ING
S -
$M
$3.04 M $3.16 M
$4.34 M
$ 2.63 MMIN PC SAVINGSMIN PC SAVINGS
MIN PC SAVINGS
MIN PC SAVINGS
SUMMARY
• MINIMUM ECONOMIC JUSTIFICATION FOR SINGLETON SO4 or SO5 OPTION REQUIRES SANDOW GENERATION
• MINIMUM ECONOMIC JUSTIFICATION FOR TNPBC PROJECT REQUIRES EITHER ONE OAKGROVE UNIT OR ONE TWIN OAK UNIT
• MINIMUM ECONOMIC JUSTIFICATION FOR TNPBC WITH SINGLETON ALSO REQUIRES ONE OAK GROVE UNIT OR ONE TWIN OAK UNIT
•ADDITIONAL ANALYSIS OF NEW SUB IN NORTH HOUSTON NEEDED BEFORE RECOMMENDATION
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