1. CMWG Update to WMS 5-11-09

2. Met 4/24 & 5/11 Continued Work on PRR 801 –Discussed outages as related to TCR Cases –ERCOT evaluates various outage combinations & translates the impacts into a CSC flows ERCOT will evaluate 3 TCR cases to compare: Transfer capability for sale vs. most limiting transfer capability (on each CSC) given different sets of outages –Only point of agreement so far is that revenue neutrality should be for forward month only (not to make up historical shortfalls Discussed SCR on posting VSAT limits for N  H

3. SAPS-Menard ERCOT to provide at meeting

4. W  N Stability Limit ERCOT Studies are completed ERCOT will provide market notice & new matrix by end of May Permian RMR units –Permian 5 (114 MW) –Permian 6 (515 MW) Only Permian 6 has PSS (but other units in W Zone also have PSS)

5. CRE Criteria Refinements Discussion Current Protocols: Goal is to find transmission elements that respond similarly to the CSCs from the deployment of BES Experience with CREs (past) shows that refinements may be needed.

6. Potential Approach Under Consideration: 4 Component Test Threshold weighted shift factor/PTDFs –Shift Factors between Source/Sink Zones –Weighted averages consider only price responsive gen Resource concentration Boundary generation –Generation that has impact on constraint that is counter to the zone it is in Concentration of Effective Generation –Compare percentage of capacity to the percentage of impact Correlation of CRE to its zone

7. Upcoming Work Review ERCOT findings on TCR Cases for PRR 801 2010 CSC Process Kicks off In June