QMWG June 2012 Generation Resource Energy and Regulation Deployment Summary

2 Non-IRR GREDP – Energy Deployments June GREDP Score below 85%: QSE NameResource NameFuel TypeTotal Intervals PassedTotal Intervals ScoredStd Dev (GREDP MW)GREDP Monthly Score SCLE SCLE SCLE SCLE

3 IRR GREDP Summary Total IRR GREDP Performance AprilMayJuneAprilMayJune Intervals Passed20,72717,72810,18669,15539,66542,325 Intervals Scored22,73419,28611,41974,79343,45546,373 GREDP Monthly Score91%92%89%92%91% Std Dev (ATG - Exp MW)5.43 MW6.61 MW8.13 MW8.23 MW8.41 MW9.22 MW

4 June IRR Failures QSE NameResource NameFuel TypeTotal Intervals PassedTotal Intervals ScoredStd Dev (ATG-Exp MW)GREDP Monthly Score WIND1,2671, WIND WIND WIND WIND WIND WIND WIND WIND WIND WIND WIND WIND WIND WIND WIND WIND IntervalsGREDP Failures Scored ≤ > Scored ≤ > Scored ≤ > Scored1

Manual HDL/LDL Override Summary QMWG

6 Daily Summary Graph For this analysis, we captured unique HDL/LDL overrides –An override is considered unique if that same Resource did not have an override within the last 10 minutes There were 14 total unique overrides in June – As compared to 8 in May and 1 in April

7 Daily Summary Table Date Total Number of Overrides Number of Resources with an Override Number of Unique HDL/LDL Overrides Jun 1, Jun 2, Jun 3, Jun 4, Jun 5, Jun 6, Jun 7, Jun 8, Jun 9, Jun 10, Jun 11, Jun 12, Jun 13, Jun 14, Jun 15, Jun 16, Jun 17, Jun 18, Jun 19, Jun 20, Jun 21, Jun 22, Jun 23, Jun 24, Jun 25, Jun 26, Jun 27, Jun 28, Jun 29, Jun 30,

8 Reasons for Manual HDL/LDL Overrides Outages required overrides as a result of local voltage issues The following constraint had SCED executions counted towards irresolvability: XBA3T89 : 2585_1 This constraint has not met the criteria for resetting the shadow price cap