ERCOT PUBLIC5/20/2014 1

2014 RTP

July 22, 2014

ERCOT PUBLIC5/20/2014 2

Outline

Updates to 2014 RTP

RTP Next steps

ERCOT PUBLIC5/20/2014 3

2014 RTP update

N-1 SCOPF reliability analysis is complete

N-1 secure case and list of placeholder projects

are posted for review

Currently working on Generator and

Transformer outage (G-1+N-1 and X-1+N-1)

reliability analysis

ERCOT PUBLIC5/20/2014 4

Transmission equipment upgrades based on N-1 SCOPF

Upgrade needs identified by kV

69 138 345 2014 RTPPreviously Identified*

Line Addition 1 6 2 9 5

Line Upgrade 11 21 - 32 17

Transformer Addition

- 3 4 7 7

Transformer upgrade

- 5 - 5 4

Terminal equipment upgrade

- 6 - 6 4

* Projects identified in previous RTP or the 2013 west Texas study which were needed in 2014 RTP

ERCOT PUBLIC5/20/2014 5

Project Description

1) Firewheel - Wylie Switch 138-kV line upgrade

2)Northwest Carrollton - Lake Pointe 138-kV line upgrade

3) Dickinson - League City 138-kV line upgrade

4) South Shore - Hidden Lakes 138-kV line upgrade

5)Loop Roans Prairie - King 345-kV line into Rothwood

6) Switched shunt at Stewart

7) Switched shunt at PH Robinson

8)Arena Tap - Andrew County South 138-kV line upgrade

9) Big Lake - Stiles new 138-kV line

10)

Flat Top TNP - Barilla Tap 138-kV tie 1. Tap existing Barilla - Musquiz138-kV line 2. New 138-kV line from the tap to Flat Top 3. New 138/69-kV transformer at Flat Top TNP 4. Upgrade Barilla Draw Tap TNP - Flat Top TNP

2014 RTPN-1 Projects

345-kV new project additions138-kV new project additions138-kV project upgrades

69-kV projects and terminal equipment upgrade projects not shown

*Projects identified in previous RTP/West Texas Study

ERCOT PUBLIC5/20/2014 6

Project Description

11)

McDonald - Spraberry 138-kV line 1. Upgrade McDonald Road 138-kV switching station 2. Install McDonald Road Sw Station - Garden City East 138-kV line on new double circuit structures and operate both 69 kV and 138 kV 3. Upgrade Spraberry 138-kV Switching Station 4. Install Spraberry Switching Station - Garden City East 138-kV line on new double circuit structures and operate both 69 kV and 138 kV

12) Midland East - Stanton East 138-kV line upgrade

13)(a) Mason - Sand Bend POI 138-kV line upgrade(b) Mason - Culberson 138-kV line upgrade

14)

(a) Add a new 345/138-kV autotransformer at Twin Buttes(b) Upgrade San Angelo Red Creek - San Angelo Coke Street 138-kV line

15)Ferguson - Sandy Creek - Pittsburg 138-kV line upgrade

16) Dermott - Ennis Creek 138-kV line upgrade

17) Morgan Creek - Cosden 138-kV line upgrade

18)Northeast Switchyard project with new auto at Highway 46 and tie to LCRA terminating at Clear Springs

19)Hutto Switch - Round Rock Northeast - Round Rock 138-kV line upgrade

2014 RTPN-1 Projects

345-kV new project additions138-kV new project additions138-kV project upgrades

69-kV projects and terminal equipment upgrade projects not shown

*Projects identified in previous RTP/West Texas Study

ERCOT PUBLIC5/20/2014 7

Project Description

20)Tap the 138-kV LCRA line between Shiner and Moulton and add a 69/138-kV auto at the GVEC Moulton substation

21) Zorn - York - Seguin 138-kV line upgrade

22)Lockhart auto and Lockhart - Seawillow - Luling 138-kV line upgrade

23) Marion - Cibolo second circuit addition

24) Pearsall - Paloduro 138-kV line upgrade

25) Fowlerton 345/138-kV auto addition

26)Lobo 345/138-kV auto addition and close San Diego tie between AEP and STEC

27) Cross Valley Project tap at South McAllen

28)Build 138-kV line between Escondido and West Batesville

29) Stewart Road - Weslaco Unit 138-kV line upgrade

30) Escondido - Eagle Pass 138-kV line upgrade

31) Bethel 138/69-kV autotransformer upgrade

32) Olsen 138/69-kV autotransformer upgrade

33) George West 138/69-kV auto upgrade*

34) Pleasanton 138/69-kV transformer upgrade*

35) Stewart 138/69-kV transformer upgrade, Stewart - Rio Rico and La Palma - Rangerville 69-kV line upgrades

2014 RTPN-1 Projects

345-kV new project additions138-kV new project additions138-kV project upgrades

69-kV projects and terminal equipment upgrade projects not shown

*Projects identified in previous RTP/West Texas Study

ERCOT PUBLIC5/20/2014 8

Next steps