RMR Exit for Spencer 5 – Remedial Action Plans

April 16, 2010

Regional Planning Group

RMR Exit for Spencer 5 – Remedial Action Plans

Chris NgaiJay Teixeira

2

Summary

ERCOT staff analysis of the Spencer 5 exit from RMR status indicated that the Remedial Action Plans (RAPs) described herein would facilitate the unit’s RMR exit. Slide 3 contains a list of the six RAPs proposed as an RMR exit strategy for Spencer 5 with detailed descriptions of the RAPs in the subsequent slides.

Review of the RAPs submitted by Oncor on April 14 is currently in progress. RAPs were revised to take into account current construction activity.

This analysis was performed using the 2010 summer peak case; last updated on December 11, 2009.

3

List of RAPs

RAPDescription

Contingency/Overload pair Est. Hours/yr*

1 Carrollton RAP

L: Lewisville Switch (645)-Highland E 138kV(1970) lineC: Lewisville Switch (645)-Highland(664)

613

L: Lewisville Switch (645)-Highland E 138kV(1970) lineC: Highland (664) - Canyon (668)

7

2Lake Pointe

RAPL: Carrollton Northwest-LakePointe 138kV lineC: Lewisville Switch 345/138kV autotransformer

208**

3 Highland RAPL: Lewisville Switch (645)-Highland E 138kV(1970)

138kV lineC: Coppell-Lewisville Switch

10

4 Frisco RAPL: Collins (2370) to Frisco (681) 138kV lineC: Denton Steam – Corinth; Teasley to Pockrus

278

5Frisco Voltage RAP

L: Low voltage at Frisco and Panther CreekC: Collin to Frisco 138kV line

90

6 Arco RAPL: Collins (2370) to Frisco (681) 138kV lineAfter Operation of Carrollton RAP or Lake Pointe RAP

See above

*based on SSWG load level and one unit unavailable**138 kV line from NW Carrollton to Lewisville still in service through summer this RAP not needed

4

RAP 1 – Carrollton RAP

• Problem 1– Contingent element: Lewisville Switch (645)-Highland(664)– Overload element: Lewisville Switch (645)-Highland E

138kV(1970) line (Rate A/B/C: 214/214/214)– RAP operation: Open NW Carrollton (2361) – Lewisville Switch

(646) 345kV and 138 kV lines– Level of overload: 117.8% Rate B (252.1MVA)– Estimated number of hours RAP would operate in year 2010:

613 hours

5

RAP 1 – Carrollton RAP cont’d 613 hours

ROANOKE2

ALLIANCE

CRLTN_NWELMFK1T_

ELMFKN1_

NLKPMP1T

ELMFK1_8

ADSN1_8

CRLTN_NW

ELMFK2T_

CRLTNTAR

ELMFKN2_

ELMFK2_8MCKAMY_T

MCKAMYRD

COPPELL_

MCKAMY

COPPELL

GRAPEVIN

MOUND

IBM

LEWISVIL

ROANOKE1

LEWISVLS

KELLER

STHLAKE1

WROANOKE

KLR_MAG1

KLR_MAG2

HEBRN_P8

ROANOKE

CRLTNFRK

CRLTN_NW

HEBRON

CRLTN_NW

HIGHLAND

LEW_JNS_

CRLTNRMD

CRLTNJSY

TNLWVLST

TNLWVLTI

TNLAKEPN

TNLWVLWE

FLWRMND_

TNHIGHLA

CANYON

TNJONES_

ADSN1T_8

HIGHL_E_

MCPHERSN

MCPHERSO

1853

1855

2361

2586

2580

2590

2569

2362

2587

2558

2581

25892025

2024

2015

658

648

555

656

556

660

1854

645

565

2020

2018

2034

2376

640

2519

2360

663

2363

664

1972

2562

2555

37100

37080

37010

37060

2030

37050

668

37030

2576

1970

1857

679

CROSTIMB661

TNBIOENR37011

LEWISVLS

646AUSRNCH2

2377

FLWRMNDS2031

KIMBALRO657

ROANOKE3

ROANOKE1

ROANOKE1 ROANOKE2

ROANOKE1

ROANOKE2

ROANOKE2

HERITAGE

HRTAG1_T HRTAG2_T

KEL_MAG2

KELLER1T

KELLER2_

PL_COMM12568

1983

ELIZCRK11866

1852

1850

1851 1849

1845

1847

1848

113 MW 41 Mvar

94 MW 30 Mvar

107 MW 35 Mvar

51 MW 14 Mvar

21 MW 8 Mvar

60 MW 18 Mvar

49 MW 14 Mvar

32 MW 20 Mvar

7 Mvar

15.3 Mvar

98.7 Mvar

15.3 Mvar

15.0 Mvar

36.0 Mvar

108 Mvar

4.9 Mvar

57.1 Mvar

0.0 Mvar 56.6 Mvar

27.9 Mvar

14 Mvar

6%B

Amps

23%B

Amps

29%B

Amps

6%B

Amps

5%B

Amps

AVONDALE

14 MW 4 Mvar

10 MW 2 Mvar

602

24%B

Amps

1%B

Amps

1730 Contingency:

Lewisville Switch (645) to Highland E (1970) 138kV line

Overload element: Lewisville Switch (645) to Highland (664) 138kV line

RAP action:Open the NW Carrollton (2361) – Lewisville Switch (646) 345kV line

Denton

NW Carrollton

Roanoke

6

RAP 1 – Carrollton RAP cont’d

• Problem 2– Contingent element: Highland (664) - Canyon (668)– Oveload element: Lewisville Switch (645)-Highland E

138kV(1970) line (Rate A/B/C: 214/214/214)– RAP operation: Open the NW Carrollton (2361) – Lewisville

Switch (646) 345kV and 138 kV lines– Level of overload: 101.9% Rate B (218.1MVA)– Estimated number of hours RAP would operate in year 2010: 7

hours

7

RAP 1 – Carrollton RAP cont’d 7 hours

PL_TENNY

ROANOKE2

ALLIANCE

CRLTN_NWELMFK1T_

ELMFKN1_

NLKPMP1T

ELMFK1_8

ADSN1_8

CRLTN_NW

ELMFK2T_

CRLTNTAR

ELMFKN2_

ELMFK2_8MCKAMY_T

MCKAMYRD

COPPELL_

MCKAMY

COPPELL

GRAPEVIN

MOUND

IBM

LEWISVIL

ROANOKE1

LEWISVLS

KELLER

STHLAKE1

WROANOKE

EMCS1_8

KLR_MAG1

KLR_MAG2

HEBRN_P8

ROANOKE

CRLTNFRK

CRLTN_NW

HEBRON

CRLTN_NW

HIGHLAND

LEW_JNS_

CRLTNTAR

CRLTNRMD

CRLTNJSY

TNLWVLST

TNLWVLTI

TNLAKEPN

TNLWVLWE

FLWRMND_

TNHIGHLA

CANYON

TNJONES_

ADSN1T_8

ADSN2T_8

HIGHL_E_

MCPHERSN

MCPHERSO

1853

1855

2361

2586

2580

2590

2588

2569

2362

2587

2558

2581

25892025

2024

2015

658

648

555

656

556

660

1854

645

565

2020

2018

2065

2033

2034

2376

640

2519

2360

663

2363

664

1972

2559

2562

2555

37100

37080

37010

37060

2030

37050

668

37030

2576

2577

1970

1857

679

CROSTIMB661

TNBIOENR37011

LEWISVLS

646AUSRNCH2

2377

AUSRNCH12378

FLWRMNDS2031

KIMBALRO657

ROANOKE3

ROANOKE1

ROANOKE1 ROANOKE2

ROANOKE1

ROANOKE2

ROANOKE2

CRLTNCC1

HERITAGE

HRTAG1_T HRTAG2_T

KEL_MAG2

KELLER1T

KELLER2_

PL_COMM12568

PL_COMM22570

CORINTHS1983

ELIZCRK11866

1852

1850

1851 1849

1845

1847

1848

EGLMTLAK12065

113 MW 41 Mvar

94 MW 30 Mvar

107 MW 35 Mvar

74 MW 19 Mvar

51 MW 14 Mvar

21 MW 8 Mvar

60 MW 18 Mvar

49 MW 14 Mvar

32 MW 20 Mvar

60 MW 18 Mvar

7 Mvar

15.4 Mvar

98.6 Mvar

15.2 Mvar

15.3 Mvar

36.0 Mvar

108 Mvar

4.9 Mvar

57.1 Mvar

0.0 Mvar 56.6 Mvar

14.7 Mvar 14.7 Mvar

27.9 Mvar

14 Mvar 10 Mvar

6%B

Amps

23%B

Amps

29%B

Amps

6%B

Amps

6%B

Amps

AVONDALE

80 MW 20 Mvar

14 MW 4 Mvar

10 MW 2 Mvar

602

24%B

Amps

KRUMW_5

1%B

Amps

1730

37%B

Amps

37%B

Amps

58%B

Amps

Contingency:

Highland (664) to Canyon (668) 138kV line

Overload element:Lewisville Switch (645) to Highland E (1970) 138kV line

RAP action:Open the NW Carrollton (2361) – Lewisville Switch (646) 345kV line

NW Carrollton

Roanoke

Denton

8

RAP 2 – Lake Pointe RAP

– Contingent element: Lewisville Switch (645)-Highland(664)– Overload element: Lewisville Switch 345/138kV autotransformer

(Rate A/B/C: 700/700/700)– RAP operation: Open the line TNMP Lake Pointe (37010) –

TNMP Lewisville (37080)– Level of overload: 113.3% Rate B (317.3MVA)– Estimated number of hours RAP would operate in year 2010:

208 hours– Not needed in 2010 summer due to 138 kV line from Lewisville

to NW Carrollton line being in case• May activate Arco RAP to handle Double Circuit contingency

• Causes Collin to Frisco to overload

9

RAP 2 – Lake Pointe RAP cont’d 208 hours

MCKAMYRD

MCKAMY

MOUND

LEWISVIL

LEWISVLS

WROANOKE

CRLTNFRK

LEW_JNS_

TNLWVLST

TNLWVLTI

TNLAKEPN

TNLWVLWE

FLWRMND_

TNJONES_

HIGHL_E_

2024

658

656

660

645

2018

2519

1972

37100

37080

37010

37060

2030

37030

1970

CROSTIMB

TNBIOENR37011

LEWISVLS

646

FLWRMNDS2031

ROANOKE2

51 MW 14 Mvar

96.9 Mvar

8%B

Amps

8%B

Amps

1%B

Amps

Contingency:Lewisville Switch 345/138kV autotransformer

Overload element:Carrollton Northwest – Lake Pointe 138kV line

RAP action:Open the line TNMP Lake Pointe (37010) – TNMP Lewisville (37080)

Denton

NW Carrollton

10

RAP 3 - Highland RAP

– Contingent element: Coppell-Lewisville Switch – Overload element: Lewisville Switch (645)-Highland E

138kV(1970) 138kV line (Rate A/B/C: 214/214/214)– RAP operation: Open Lewisville Highlands (37050) – Lewisville

West (37060)– Level of overload: 101.8% Rate B (217.8MVA)– Estimated number of hours RAP would operate in year 2010: 10

hours– Coppell to Lewisville Switch contingency sectionalized to

Lewisville Switch to Lewisville.• Overload element: Coppell Tap to McKamy Tap

• May not related to Spencer RMR

11

RAP 3 - Highland RAP cont’d 10 hours

Denton

LEWISVIL

LEWISVLS

HIGHLAND

LEW_JNS_

TNLWVLST

TNLWVLWE

FLWRMND_

TNHIGHLA

ARGYLE1_

CANYON

TNJONES_

HIGHL_E_

INDSTRL1

660

645

664

1972

37100

37060

2030

37050

1984

668

37030

1970

913

LEWISVLS

646

CORINTHS1983

ELIZCRK11866

100.3 Mvar

15.7 Mvar

54.2 Mvar

8%B

Amps

2%B

Amps

KRUMW_5

1%B

Amps

1730

Contingency:Coppell to Lewisville Switch 138kV line

Overload element:Lewisville Switch (645) - Highland E (1970) 138kV line

RAP action:Open Lewisville Highlands (37050) – Lewisville West (37060)

NW Carrollton

12

RAP 4 – Frisco RAP

– Contingent element: Denton Steam – Corinth & Teasley - Pockrus

– Overload element: Collins (2370) to Frisco (681) 138kV line (Rate A/B/C: 256/256/256)

– RAP operation: • Raise the voltage of the West Denton 138kV side to 140kV

• Modify the Collin Switch Reactor SPS so that it will operate when the Collin to Frisco line overloads.

• If this does not resolve the overload, put all three capacitor banks at Navo in-service

• Verify Argyle and Corinth capacitors are on

– Level of overload: 109% Rate B (276.9MVA)– Estimated number of hours RAP would operate in year 2010:

278 hours

13

RAP 4 – Frisco RAP cont’d 278 hours

PL_TENNY

COLLINSS

BRIDGES_

FRISCO

CUSTER

BRIDGES

COLONY_8

HEBRN_P8

LEBNON_P

LEBANON

MCDERMT_

PL_CUSTRPL_CUSTR

2522

2517

681

655

659

2518

2376

2515

651

2516

2526

COLLINSS2372

COLLIN_1

NAVO662

AUSRNCH22377

AUSRNCH12378

COLLIN1_2364

ROLATER22368

0 MW 0 Mvar

PNTHRCRE649

2370

2349

PL_COMM12568

PL_COMM22570

CUSTER1_2566

CUSTER2_2567

ROMJUARZ2688

ROMANJUA629

2371

ROCKHILL675

CUSTER2653

116 MW

37 Mvar

74 MW 19 Mvar

71 MW

62 MW 20 Mvar

12.1 Mvar

226.3 Mvar

29.7 Mvar

6%B

Amps

32%B

Amps

37%B

Amps

37%B

Amps

58%B

Amps

N_DENT_8

DN_STEAM

JMCRSTL1

TEASLEY1

POCKRUS1

N_DENT69

ARGYLE1_

CORINTH1

SPNCR_SW

KRUM_P8

LAKEDALL

KINGSROW

HICKORY6

LOCUST69

NLAKES69

WOODROW6

985

982

916

912

1984

1985

908

1990

671

909

910

914

915

901

670KRUM

1986KRUM_T8

CORINTHS1983

SPNCRINT

POLESPL2904

FTWORTH1919

918

917

RDWELLS6932

RDWELLS1930

981

N_DENT_T959

W_DENT_T984

BONBRAE6905

DN_STSTR1001

N_DENSTR1009

W_DENSTR1011

W_DENSTR

1012

W_DENT_T

972

80.7 MW

23.5 Mvar 7 Mvar

53.9 Mvar

9.5 Mvar

KRUMW_51730

8%B

Amps

Contingency:Denton Steam auto-transformer to Corinth &Teasley to Pockrus 138kV line

Overload element:Collins (2370) to Frisco (681) 138kV line

RAP action:Raise the voltage of the West Denton 138kV side to 140kV

RAP action:Collin Switch Reactor SPS operates when the Collin to Frisco line overloads

RAP action:put all three capacitor banks at Navo in-service

CollinNorth Denton

Spencer

14

RAP 5 - Frisco Voltage RAP

– Contingent element: Collin to Frisco 138kV line – Low voltage element: Frisco and Panther Creek bus– RAP operation:

• Raise voltage at West Denton to 1.02~1.05

• adjust power factor/load

– Level of overload: 0.8942 p.u.– Estimated number of hours RAP would operate in year 2010:

• <0.92 p.u. – 584 hours (Brazos Criteria)

• <0.90 p.u. – 90 hours (ERCOT Criteria)

15

RAP 6 – Arco RAP

• Cause

– Carrollton RAP– Lake Pointe RAP

• Overload element: Collin (2370) to Frisco (681) 138kV line (Rate A/B/C: 256/256/256)

• RAP operation: Open Arco (1993) – Krugerville (1994)138kV line• Level of overload:

– Carrollton RAP (line loadings refer to Collin to Frisco)• Problem 1 - 115.4% (239.4 MVA) after Carrollton RAP [pre RAP:

104.1% 266.4 MVA Collins SPS would relieve this but not after Carrollton RAP so should use Arco RAP instead]]

• Problem 2 – 113.8% (291.4 MVA) after Carrollton RAP [pre RAP: 102.3% 262.0 MVA Collins SPS would relieve this but not after Carrollton RAP so should use Arco RAP instead]]

– Lake Pointe RAP - 111.2% (284.6 MVA) after Lake Pointe RAP [pre RAP: 110.6% 283 MVA]

16

RAP 6 – Arco RAP cont’d Same # of hours as Carrollton RAP & Highland RAP

COLLINSS

BRIDGES_

FRISCO

CUSTER

BRIDGES

KRUGRVL1

ARCO1_8

ARCO_T_8

DENARCO1

2517

681

655

659

1994

1993

983

911

NAVO662

PNTHRCRE649

2370

CUSTER1_2566

CUSTER2_2567

ROMJUARZ2688

ROMANJUA629

CUSTER2

12.2 Mvar

226.3 Mvar

Overload element:Collins (2370) to Frisco (681) 138kV line

Contingency:overload caused by Carrollton RAP and Lake Pointe RAP

RAP action:Open Arco (1993) – Krugerville (1994)138kV line Collin

Krugerville

Arco

Navo

Panther Creek

17

Permanent RMR Exit Solutions

ProjectTPIT

Estimated Completion

Date

1 RD Wells to Hickory 69kV (Denton)06TPIT0198(tier 4)

June 2010

2Upgrade Lewisville Switch to Highland (TNMP) 138 kV line to 290MVA or above

07TPIT0018(tier 4)

May 2015

3Add second 345/138kV autotransformer at Lewisville switching substation

07TPIT0042(tier 3)

June 2011

4 Upgrade Collin to Frisco 138kV line to 326MVA08TPIT0068(tier 4)

June 2013

5Upgrade West Denton to Jim Christal to North Denton138kV line to 250 MVA or above

Per E. Schroeder (TMPA) email dated 3/10/2010

Summer 2012

6Additional capacitor banks at Navo and Panther Creek Substations (interim for Mustang capacitor bank)

2011

7New Mustang Substation and capacitor bank

10TPIT0083(tier 4)

June 2013

8 Upgrade Arco to Krugerville 138kV10TPIT0032(tier 4)

May 2011

Questions?