Aug 14, 2009 Regional Planning Group Proposed CREZ Project Modifications Warren Lasher Manager, System Assessment

2 TSPs have submitted proposed changes to the CREZ plan due to routing and engineering considerations. The following types of changes have been proposed: Conductor Changes Substation Locations Endpoint Changes Other Changes ERCOT is reviewing these proposed changes to determine if they are cost-effective and consistent with the CREZ Plan in the CTO Study. Regional Planning GroupAug 14, 2009 Proposed CREZ Project Modifications

3 Regional Planning GroupAug 14, 2009 Background : Default : Priority In case you have been on sabbatical for the last two years: The CREZ Plan

4 Regional Planning Group Conductor Modifications ETT has proposed using ACSS in place of ACSS/TW and ACSR. CTT has proposed to use ACSS in place of ACSR. Oncor and LCRA have proposed using ACSS/TW in place of ACSS/TW. Lonestar has proposed using ACSS/TW in place of ACSS/TW. Bandera is using ACSR instead of ACSR for the upgrade of the Bandera to Verde Creek circuit. Aug 14, 2009

5 Regional Planning Group Proposed Station Changes TSPs are selecting sites for the new CREZ substations. Many of the new substations will be located near but not directly underneath the blue dots, as the TSPs find suitable locations. Other station changes include: Riley Substation – New station near Oklaunion designed for new CREZ circuits to Tesla, PanOakMid, Bowman, and West Krum, and for the existing circuit to Fisher Road. Two independent connections to Oklaunion. (ETT) Sweetwater East Substation – Instead of connecting circuits from Tonkawas to Central Bluff stations into the Sweetwater Cogen station, build a new station and connect to both circuits from Morgan Creek to Graham (Oncor) Odessa EHV - Construct an extension to the Odessa EHV station for circuits from West C and McCamey A (Oncor) Aug 14, 2009

6 Regional Planning GroupAug 14, 2009 Station Changes

7 Regional Planning Group Proposed Endpoint Changes TSPs have proposed the following CREZ line end point changes: Bluff Creek Substation – Connect only one of the two circuits running from Central Bluff to Brown into this station (ETT) Killeen Substation - Connect both CREZ circuits into Killeen instead of one circuit from Brown to Salado bypassing Killeen. Add a second auto at Killeen. (Oncor) West Wind Substation – Connect the circuit from Gillespie to Kendall to an alternate substation located west of Kendall (LCRA). After ERCOT evaluation, this proposal is not recommended. Aug 14, 2009

8 Regional Planning GroupAug 14, 2009 Proposed Endpoint Changes

9 Regional Planning Group Proposed Endpoint Changes (II) Other CREZ line end point changes: Alternative to rebuild of Abilene S to Leon 138 kV line – Add a 2nd circuit to Abilene E to Putnam 69kV line and convert Putnam to Leon 69 kV line to 138 kV – This proposal has been reviewed and approved as an RPG Project (ETT) Alternative to rebuild of Sonora to Hamilton Road 138 kV line – Rebuild and convert Ft. Lancaster to Hamilton Road 69 kV line to 138 kV (ETT) Alternative to new 138-kV circuit from Mason to Pittsburg - Rebuild the existing Mason to Pittsburg 69-kV circuit as 138-kV ACSR (LCRA) Aug 14, 2009

10 Regional Planning GroupAug 14, 2009 Proposed Endpoint Changes (II)

11 Regional Planning Group Other Changes Other CREZ Plan changes: Bowman to Jacksboro 345-kV line – Existing single-circuit structures were determined insufficient for reconductoring as specified in CTOS/CTP; new double-circuit-capable structures with one circuit of ACSS/TW conductor were proposed (Oncor) Aug 14, 2009

12 Regional Planning GroupAug 14, 2009 Other Changes

13 Regional Planning Group Questions? Aug 14, 2009

14 Regional Planning Group Substation Names Aug 14, 2009 CREZ Report NamePermanent NameCREZ Report NamePermanent Name Panhandle A-ANazarethMcCamey ANorth McCamey Panhandle A-BHerefordMcCamey BTippet Panhandle A-CSilvertonMcCamey CBakersfield Panhandle A-DCottonwoodMcCamey DBig Hill Panhandle B-AWhite Deer(none) Edison Panhandle B-BGrayCentral AScurry County South PanOakMidEdith ClarkeCentral BDermott New OklaunionRileyCentral C(not yet known) SweetwaterSweetwater EastCentral DSand Bluff West ALong DrawCentral EBearkat West BEctor County NorthCentral Bluff West CGrelton

15 Regional Planning Group Line Crossings Aug 14, 2009 The pink dots represent line crossings that could have a market impact; blue dots represent line crossings that could have a customer impact