June 3, 2010Technical Advisory Group

RMR Exit for Spencer 5 – Remedial Action Plans

Jay Teixeira

2

Summary

ERCOT staff analysis of the Spencer 5 RMR exit strategy identified the need for several transmission line upgrades as well as transformer and capacitor bank additions.

To allow exit of RMR prior to completion of the identified projects, Remedial Action Plans (RAPs) were developed.

3 TACJune 3, 2010

List of RAPs needed for 2010**

RAPDescription Contingency/Overload pair

1 Carrollton RAP

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

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

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

6 Frisco Voltage RAP

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

7 Arco-Krugerville RAP

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

• based on 2010 SSWG load level and one unit unavailable• need for RAPs prior to completion of exit strategy projects will be reviewed each year

4

Permanent RMR Exit Solutions

ProjectCost

Estimated Completion

Date

1 RD Wells to Hickory 69kV (Denton) $10,167,000* June 2010

2 Upgrade Lewisville Switch to Highland (TNMP) 138 kV line to 290MVA or above $521,170* May 2015

3 Add second 345/138 kV autotransformer at Lewisville switching substation $17,165,150* June 2012

4 Upgrade Collin to Frisco 138 kV line to 326 MVA $981,594* June 2013

5 Upgrade West Denton to Jim Christal to North Denton138 kV line to 250 MVA or above $5,000,000 Summer 2012

6 Additional capacitor banks at Navo and Panther Creek Substations (interim for Mustang capacitor bank) Included in item 7 2011

7 New Mustang Substation and capacitor bank $2,760,500* June 2013

8 Upgrade Arco to Krugerville 138 kV $4,193,381* May 2011

*Planned prior to Spencer NSO

5

Cost Analysis

The estimated annual RMR fixed costs that would be uplifted on an on-going basis are greater than the annual carrying costs of the transmission projects, notwithstanding any additional production cost savings.

Projects planned prior to Spencer NSO not included in transmission project cost.

6

Questions?

7

Details

8

RAP 1 – Carrollton RAP

• Problem 1– Contingent element: Lewisville Switch (645)-Highland(664)– Overload element: Lewisville Switch (645)-Highland E 138

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

(646) 345 kV and 138 kV lines– Level of overload: 121.2% Rate B (259.4 MVA)– Estimated number of hours RAP could operate in year 2010:

722 hours

9

PL_TENNY

ROANOKE2

ALLIANCE

CRLTN_NW

FB1_8

ELMFK1T_

ELMFKN1_

NLKPMP1T

ELMFK1_8

NLKPMP1_

FBGILS1_

NTHLK_S8

ADSN1_8

CRLTN_NW

ELMFK2T_

CRLTNTAR

ELMFKN2_

ELMFK2_8

CRLTNUF2COPPELTP

MCKAMY_T

MCKAMYRD

COPPELL_

MCKAMY

COPPELL

GRAPEVIN

MOUND

IBM

LEWISVIL

ROANOKE1

LEWISVLS

KIMBALL1

KELLER

STHLAKE1

WROANOKE

EMCS1_8

KLR_MAG1

KLR_MAG2

COLONY_8

HEBRN_P8

ROANOKE

CRLTNFRK

CRLTN_NW

HEBRON

CRLTN_NW

HIGHLAND

LEW_JNS_

CRLTNTAR

CRLTNRMD

CRLTNJSY

CRLTNUF1

TNLWVLST

TNLWVLTI

TNLAKEPN

TNLWVLWE

FLWRMND_

TNHIGHLA

ARGYLE1_

CANYON

TNJONES_

LAKEDALL

PL_TENNY

ADSN1T_8

ADSN2T_8

HIGHL_E_

INDSTRL1

MCPHERSN

MCPHERSO

WAGROBT1

1853

2522

1855

2361

2583

2586

25802590

2588

2582

2569

2362

2587

2558

2581

2589

2014

2025

2024

2015

658

648

555

656

556

660

1854

645

565

2020

2018

2065

2033

2034

2518

2376

640

2519

2360

663

2363

664

1972

2559

2562

2555

2535

37100

37080

37010

37060

2030

37050

1984

668

37030

671

2523

2576

2577

1970

913

1857

679

2075

CROSTIMB661

TNBIOENR37011

LEWISVLS646

AUSRNCH22377

AUSRNCH12378

FLWRMNDS2031

KIMBALRO657

ROANOKE3

ROANOKE1

ROANOKE1 ROANOKE2

ROANOKE1

ROANOKE2

ROANOKE2

WPKELLR12037

WPKELLR22038

CRLTNCC1

HERITAGE

HRTAG1_T HRTAG2_T

KEL_MAG2

KELLER1T

KELLER2_

PL_COMM12568

PL_COMM22570

CORINTHS1983

ELIZCRK11866

1852

1850

1851 1849

1845

1847

1848

629

96 MW 29 Mvar

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

99.7 Mvar

15.3 Mvar

15.2 Mvar

36.0 Mvar

108 Mvar

53.2 Mvar

4.9 Mvar

4.9 Mvar

0.0 Mvar

57.1 Mvar

114.9 Mvar

0.0 Mvar 56.4 Mvar

231.8 Mvar

14.6 Mvar 14.6 Mvar

27.8 Mvar

14 Mvar 10 Mvar

229 Mvar

29 Mvar

6%B

Amps

23%B

Amps

29%B

Amps

8%B

Amps

4%B

Amps

AVONDALE

80 MW 20 Mvar

14 MW 4 Mvar

10 MW 2 Mvar

602

26%B

Amps

KRUMW_5

1%B

Amps

1730

38%B

Amps 36%

B

Amps

16%B

Amps

58%B

Amps

RAP 1 – Carrollton RAP cont’d 722 hours

Roanoke

Denton

NW Carrollton

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

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

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

RAP action: Open NW Carrollton (2362) – Lewisville Switch (645) 138 kV line

10

RAP 1 – Carrollton RAP cont’d

• 138 kV Alternative Plan – RAP Operation– Open TNMP Highland – TNMP Lewisville (branch 37050 –

37060) 138 kV line – Collin – Frisco 138kV line is overload, open Arco – Krugerville

138 kV line (Branch 1993-1994).• If Allison – Krum line is in-service, Collins– Frisco 138 kV line

overload can be corrected by Collin Reactive SPS.• If Allison – Krum 138 kV line is not in-service, Lewisville Switch

(645)-Highland E 138 kV(1970) line may still be overloaded after opening Arco - Krugerville. Open Argyle – Corinth 138 kV line (Branch 1984-1985) to correct the problem

11

DN_STEAM

TEASLEY1

POCKRUS1

HIGHLAND

TNLWVLWE

FLWRMND_

TNHIGHLA

ARGYLE1_

CORINTH1

SPNCR_SW

CANYON

LAKEDALL

KINGSROW

HIGHL_E_

WOODROW6

982

664

37060

2030

37050

1984

1985

908

668

671

909

914

1970

901

SPENCER_ SPENCER_

0 MW 0 Mvar

0 MW 0 Mvar

CORINTHS1983

SPNCRINT

POLES315902

POLE_SP1903

POLESPL2904

FTWORTH1919

918

917

981

DN_STEAM956

W_DENT_T984

DN_STSTR1001

80.7 MW 23.5 Mvar

99.6 Mvar

15.6 Mvar

54.2 Mvar

9.5 Mvar

7%B

Amps

5%B

Amps

RAP 1 – Carrollton RAP cont’d

KRUGRVL1

TNKRUGRV

ARCO1_8

ARCO_T_8

DENARCO1

INDSTRL1

1994

37120

1993

983

911

NAVO662

12.4 Mvar

ContingencyLewisville 645 - Highland 664 138 kV line

Overload elementLewisville 645 – Highland 1970 138 kV line

RAP actionOpen Argyle 1984 – Corinth 1985 138 kV line

RAP actionOpen TNMP Highland 37050 – TNMP Lewisville 37060

RAP actionOpen Arco 1993 – Krugerville 1994 138 kV line

12

RAP 1 – Carrollton RAP cont’d

• Hybrid plan– Perform the 345 kV-plan upon initial detection of overload on

the Lewisville Switch (645) to Highland (1970) 138 kV line – Switch to the Alternative 138 kV-plan and put the opened NW

Carrollton – Lewisville 345 and 138 kV circuits back in service .– This allows a quicker response since only 1 TSP is involved in

the implementation of the 345 kV-plan.

13

RAP 4 – Frisco RAP

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

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

– RAP operation: • Raise the voltage of the West Denton 138 kV side to 140kV• Place Collin Series Reactor SPS in-service 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 (278.9 MVA)– Estimated number of hours RAP could operate in year 2010: 278

hours

14

N_DENT_8

DN_STEAM

JMCRSTL1

TEASLEY1

POCKRUS1

N_DENT69

ARGYLE1_

CORINTH1

SPNCR_SW

CANYON

KRUM_P8

LAKEDALL

KINGSROW

HICKORY6

LOCUST69

NLAKES69

WOODROW6

985

982

916

912

1984

1985

908

668

1990

671

909

910

914

915

901

670KRUM

1986KRUM_T8

CORINTHS1983

SPNCRINT

POLESPL2904

FTWORTH1919

918

917

RDWELLS6932

RDWELLS1930

981

N_DENT_T959

DN_STEAM956

W_DENT_T984

BONBRAE6905

DN_STSTR1001

N_DENSTR1009

W_DENSTR1011

W_DENSTR

1012

W_DENT_T

972

80.7 MW

23.5 Mvar

15.6 Mvar

7 Mvar

54.2 Mvar

9.5 Mvar

KRUMW_51730

10%B

Amps

RAP 4 - Frisco RAP cont’d

PL_TENNY

COLLINSS

BRIDGES_

FRISCO

CUSTER

BRIDGES

COLONY_8

HEBRN_P8

LEBNON_P

LEBANON

MCDERMT_

PL_CUSTR2522

2517

681

655

659

25182515

651

2516

COLLIN_1

NAVO662

AUSRNCH22377

AUSRNCH12378

COLLIN1_2364

ROLATER22368

0 MW 0 Mvar

PNTHRCRE649

2370

PL_COMM12568

PL_COMM22570

CUSTER1_2566

CUSTER2_2567

ROMJUARZ2688

ROMANJUA629

2371

CUSTER2653

116 MW 37 Mvar

74 MW 19 Mvar

62 MW 20 Mvar

12.1 Mvar

226.3 Mvar

29.7 Mvar

5%B

Amps

38%B

Amps 37%

B

Amps

58%B

Amps

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

Spencer

North DentonCollin

RAP action:Put all three capacitorBanks at Navo in-service

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

RAP action:Raise the voltage of theWest Denton 138 kV sideTo 140 kV

RAP action:Collin Series Reactor SPS OperatesWhen Collin to Frisco line overloads

278 hours

15

RAP 6 - Frisco Voltage RAP

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

• Turn on all 3 capacitor banks at Navo• Raise voltage at West Denton to 1.02~1.05

– Level of problem: • Low voltage at Frisco: 0.89718 p.u.• Lewisville (645) – Highland (1970): 104% [due to the presence of Carrollton

– Lewisville 138 kV line]• Arco (1993) – Krugerville (1994): 106.3%

– Estimated number of hours RAP could operate in year 2010: • <0.92 p.u. – 584 hours (Brazos Criteria)• <0.90 p.u. – 90 hours (ERCOT Criteria)• Arco to Krugerville – 132 hours• Lewisville to Highland – 36 hours

16

PL_TENNY

COLLINSS

BRIDGES_

FRISCO

CUSTER

BRIDGES

COLONY_8LEBNON_P

LEBANON

MCDERMT_

2522

2517

681

655

659

25182515

651

2516

NAVO662

AUSRNCH22377

AUSRNCH12378

0 Mvar

PNTHRCRE649

2370

PL_COMM12568

PL_COMM22570

CUSTER1_2566

CUSTER2_2567

ROMJUARZ2688

ROMANJUA629

CUSTER2653

116 MW 37 Mvar

74 MW 19 Mvar

31.4 Mvar

227.1 Mvar

6%B

Amps

33%B

Amps

66%B

Amps

46%B

Amps

N_DENT_8

DN_STEAM

JMCRSTL1

TEASLEY1

POCKRUS1

N_DENT69

ARGYLE1_

CORINTH1

SPNCR_SW

CANYON

KRUM_P8

LAKEDALL

KINGSROW

HICKORY6

LOCUST69

NLAKES69

WOODROW6

985

982

916

912

1984

1985

908

668

1990

671

909

910

914

915

901

670KRUM

1986KRUM_T8

CORINTHS1983

SPNCRINT

POLESPL2904

FTWORTH1919

918

917

RDWELLS6932

RDWELLS1930

981

N_DENT_T959

DN_STEAM956

W_DENT_T984

BONBRAE6905

DN_STSTR1001

N_DENSTR1009

W_DENSTR1011

W_DENSTR

1012

W_DENT_T

972

80.7 MW

23.5 Mvar

15.6 Mvar

7 Mvar

54.2 Mvar

9.5 Mvar

KRUMW_51730

10%B

Amps

RAP 6 – Frisco Voltage RAP cont’d

Contingency:Collins (2370) to Frisco (681)138 kV line

Spencer

North DentonCollin

Problem:Low voltage at Frisco

RAP action:Raise the voltage of theWest Denton 138 kV sideTo 1.02~1.05 pu

RAP action:Turn on all 3 capacitorbanks at Navo

90 hours

17

RAP 7 – Arco-Krugerville RAP

• Cause– Carrollton RAP

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

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

– Carrollton RAP – 345 kV plan• Problem 1 - 115.8% (296.3 MVA) after Carrollton RAP [pre RAP: 103.9%

259.4 MVA Collins Series Reactor SPS would relieve this but not after Carrollton RAP so use Arco RAP instead]

• Problem 2 – 114.2% (292.3 MVA) after Carrollton RAP [pre RAP: 102.1% 261.4 MVA Collins Series Reactor SPS would relieve this but not after Carrollton RAP so use Arco RAP instead]

– Carrollton RAP – 138V plan• Problem 1 – 103.2% (264.2 MVA) after Carrollton RAP [pre RAP: 103.9%

259.4 MVA Collins Series Reactor SPS would relieve this overload]• Problem 2 – 101.5% (292.3 MVA) after Carrollton RAP [pre RAP: 102.1%

261.4 MVA Collins Series Reactor SPS would relieve this overload]

18

RAP 7 – Arco RAP-Krugerville 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) 138 kV line

Contingency:overload caused by Carrollton RAP

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

Krugerville

Arco

Navo

Panther Creek

Questions?