1. Jan 22, 2013 RPG Meeting Sharyland Atlas-Driver Load Integration Project – EIR update

2. 2 Jan 22, 2013RPG Meeting Background Sharyland Cap Rock/ERCOT load Interconnection Points Colorado City interconnection (eastern) through Oncor’s Morgan Creek – China Groove 138 kV line Triangle (western) interconnection through Oncor’s Stanton East – Midland East 138 kV line Both SU-Gardendale and SU-East Midland load served radial SPP Transmission Constraints & ERCOT Load Transfer Previously ERCOT studied approx. 205 MW of load transfer (in 2014) related to evaluate the SU-SPP load transfer (at the request from PUCT related to Docket No. 39070) The latest total projected load is approx. 417 MW by 2017 (including West Texas Oil/Gas load growth) PUCT imposed a 150 MW limit on Sharyland’s SPP load Transfer of incremental new load at DRIVER substation Load at Driver will be served radial initially (currently filed for CCN)

3. 3 RPG Meeting Jan 22, 2013 Study Area

4. 4 RPG Meeting Jan 22, 2013 Map – Driver Substation

5. 5 Jan 22, 2013 RPG Meeting Reliability needs Need for additional point of Interconnections Closing the lines to Stiles and SU-Midland results in N-1 violations 417 MW transfer (from SPP) requires additional point of interconnections to the ERCOT grid ERCOT is currently reviewing different alternatives to serve the future load growth

6. 6 September 17, 2010RPG Meeting March 12, 2010 Questions?