1. ERCOT PUBLIC 10/21/2014 1 2014 RTP Update October 21, 2014

2. ERCOT PUBLIC 10/21/2014 2 Outline  Reliability Analysis summary  Economic Analysis results  RTP update

3. ERCOT PUBLIC 10/21/2014 3 Reliability Analysis Summary  2014 RTP studied the summer peak cases of 2015, 2017, 2019 and 2020  N-1, G-1 + N-1 and X-1 + N-1 SCOPF studies were performed to identify reliability criteria violations  Sensitivity cases analyzed for following scenarios  A scenario with Dallas-Fort Worth area generation with no Selective Catalytic Reduction (SCR) removed from service  A scenario with Frontera generation removed from service for summer peak cases of years 2017, 2019 and 2020.  Sensitivity case analysis to be completed  Scenario to study west Texas wind generation out of service  Scenario to study Coastal wind generation out of service

4. ERCOT PUBLIC 10/21/2014 4 Noteworthy 345-kV projects in 2014 RTP  345/138-kV autotransformer additions at Fisher Road Switch, Hicks Switch, Jewett, Jordan, Twin Buttes, Clear Springs and San Miguel and Rothwood substations.  345/138-kV autotransformer upgrades at Odessa and Renner substations.  345-kV line from Zorn to Marion addition (currently under RPG review)  345-kV line upgrade of Sandow Switch to Austrop double circuit line  Significant 345 kV projects identified in earlier studies  Upgrade of Trinidad to Watermill, Lake Creek to Tradinghouse to Sam Switch, and Big Brown to Navarro 345-kV transmission lines.  Addition of 345/138-kV autotransformers at Fowlerton, Lobo, South McAllen and Twin Buttes substations.

5. ERCOT PUBLIC 10/21/2014 5 Reliability Analysis Summary Voltage Level (kV)34513869Total Transformer Addition 123-15 Transformer Upgrade 56-11 Transmission Line Addition 1517 Transmission Line Upgrade/Reconfiguration 7551577 Voltage Level (kV) Year Required 2015 (CMP needed)201720192020 34511842 1383115203 696451 Total4827296

6. ERCOT PUBLIC 10/21/2014 6 Economic Analysis Update  2014 RTP economic analysis is being run for years 2017 and 2020.  N-1 Secure case obtained after reliability analysis was used as a start case  All transmission projects identified in the 2014 RTP Reliability Analysis were added to the start cases  List of generators meeting PG 6.9 requirement was updated  Latest fuel price information (from LTSA current trends) was used in the analysis  Fonterra generation was modeled as unavailable to ERCOT in the start case

7. ERCOT PUBLIC 10/21/2014 7 Next steps  Preparing mitigation plans for 2015 violation  Finish running sensitivity analysis  Draft-RTP report sent out for TSP review and feedback  Complete economic analysis

8. ERCOT PUBLIC 10/21/2014 8 Next steps Case conditioning Initial start cases, contingency list and list of overloads ready N-1 SCOPF analysis G-1 screening followed by G-1+N-1 analysis X-1 screening followed by X-1+N-1 analysis Reliability analysis complete with all reliability issues resolved Economic case preparation Economic analysis Prepare the final RTP report

9. ERCOT PUBLIC 10/21/2014 9 Gen meeting PG 6.9 requirements added to economic analysis Generation UnitMW for GridFuelCounty20172020 South Clay Windfarm200WindClayXX Rattlesnake Wind Ph 1211WindGlasscockXX Antelope Station359GasHaleXX Logans Gap Wind I200WindComancheXX Lamar Power Projects Upgrade 130GasLamarXX Sandow Unit 530CoalMilamXX

10. ERCOT PUBLIC 10/21/2014 10 Gen meeting PG 6.9 Requirement added to reliability cases Generation UnitMW for Grid FuelCounty2015 2017 MIN 201720192020 Briscoe Wind Farm150WindBriscoe XXXX Baffin (Penascal Wind Farm 3)202WindKennedy XXXX Panhandle Wind 2182WindCarson XXXX Midway Farms Wind161Wind San Patricio XXXX Patriot (Petronilla) Wind178WindNueces XXXX Panda Temple 2790GasBell XXXX Cameron County Wind165WindCameronXXXXX Spinning Spur Wind Three194WindOldhamXXXXX CPV Rattlesnake Den Ph 1201WindGlasscockXXXXX Jumbo Road Wind300WindCastroXXXXX Wake Wind299WindFloydXXXXX Stephens Ranch Wind Energy Phase b177WindBordenXXXXX Sendero Wind Energy Project78WindJim HoggXXXXX Green Pastures300WindKnoxXXXXX Mesquite Creek249WindBordenXXXXX Los Vientos III200WindStarrXXXXX Windthorst 265WindArcherXXXXX Hereford Wind200WindCastroXXXXX Keechi Wind 138 kV Joplin102WindJackXXXXX Grandview 1to3 (Conway Windfarm)600WindCarsonXXXXX

11. ERCOT PUBLIC 10/21/2014 11 Gen meeting PG 6.9 Requirement added to reliability cases Generation UnitMW for Grid FuelCounty2015 2017 MIN 201720192020 Longhorn Energy Center361WindBriscoe XXXXX Route66 Wind150WindRandall XXXXX Barilla Solar30SolarPecos XXXXX Stephens Ranch Wind Energy Phase 1201WindBorden XXXXX OCI Alamo 438SolarKinney XXXXX Panda Temple 1790GasBell XXXXX Panda Sherman Power809GasGrayson XXXXX Rentech Project15GasHarris XXXXX Ferguson Replacement Project570GasLlano XXXXX Miami Wind 1 Project289WindGray XXXXX Panhandle Wind 1218WindCarson XXXXX Deer Park Energy Center192GasHarris XXXXX Spinning Spur Wind Two161WindOldham XXXXX Channel Energy Center 138/345kV CT190GasHarris XXXXX PHR Peakers390GasGalveston XXXXX Baytown Chiller270GasChambers XXXXX