QMWG 5/4/2012

April 2012 Generation Resource Energy and Regulation Deployment Performance

2

NON-IRR GREDP – Energy Deployments

Resources below 85% threshold

QSE Name

Resource Name Fuel Type Total Intervals Passed

Total Intervals Scored

Std Dev(GREDP MW)

GREDP Monthly Score

<QSE> <RESOURCE> CLLIG 217 530 4.24 40.94<QSE> <RESOURCE> HYDRO 4 5 4.55 80.00<QSE> <RESOURCE> CLLIG 1,127 1,398 4.32 80.62

3

IRR GREDP

Resources below 95% thresholdFeb-12 Mar-12 Apr-12

< 10 Intervals 9 13 19>=10<100 Intervals 9 16 4>=100<500 Intervals 5 4 9>=500 Intervals 5 10 11Weighted Averaged GREDP * 94% 92.8% 91.2%Weighted Average Deviation * 5.1MWs 5.6MWs 5.4MWsTotal Intervals 22,823 30,532 22,073* Includes all WGRs (not just failures)

4

March IRR Failures

QSE Name Resource Name Total Intervals Passed

Total Intervals Scored

Std Dev (ATG-Exp MW)

GREDP Monthly Score

<QSE NAME> <RESOURCE NAME> 1,903 2,028 1.11 93.84<QSE NAME> <RESOURCE NAME> 1,423 1,557 4.34 91.39<QSE NAME> <RESOURCE NAME> 1,293 1,367 3.69 94.59<QSE NAME> <RESOURCE NAME> 999 1,203 5.56 83.04<QSE NAME> <RESOURCE NAME> 640 906 3.27 70.64<QSE NAME> <RESOURCE NAME> 535 575 1.92 93.04<QSE NAME> <RESOURCE NAME> 531 572 2.04 92.83<QSE NAME> <RESOURCE NAME> 486 567 1.09 85.71<QSE NAME> <RESOURCE NAME> 498 564 1.05 88.3<QSE NAME> <RESOURCE NAME> 484 562 12.45 86.12<QSE NAME> <RESOURCE NAME> 427 555 15.21 76.94<QSE NAME> <RESOURCE NAME> 397 426 7.97 93.19<QSE NAME> <RESOURCE NAME> 337 392 15.82 85.97<QSE NAME> <RESOURCE NAME> 289 307 4.97 94.14<QSE NAME> <RESOURCE NAME> 238 290 10.36 82.07<QSE NAME> <RESOURCE NAME> 237 289 6.1 82.01<QSE NAME> <RESOURCE NAME> 259 281 2.83 92.17<QSE NAME> <RESOURCE NAME> 46 181 12.78 25.41<QSE NAME> <RESOURCE NAME> 130 153 6.74 84.97<QSE NAME> <RESOURCE NAME> 126 140 14.71 90<QSE NAME> <RESOURCE NAME> 56 77 5.87 72.73<QSE NAME> <RESOURCE NAME> 24 29 5.56 82.76<QSE NAME> <RESOURCE NAME> 16 17 6.91 94.12

5

March IRR Failures (continued)

QSE Name Resource Name Total Intervals Passed

Total Intervals Scored

Std Dev (ATG-Exp MW)

GREDP Monthly Score

<QSE NAME> <RESOURCE NAME> 9 10 3.11 90<QSE NAME> <RESOURCE NAME> 5 6 14.16 83.33<QSE NAME> <RESOURCE NAME> 3 5 16.15 60<QSE NAME> <RESOURCE NAME> 2 4 11.07 50<QSE NAME> <RESOURCE NAME> 2 3 9.4 66.67<QSE NAME> <RESOURCE NAME> 1 3 4.02 33.33<QSE NAME> <RESOURCE NAME> 1 2 12.5 50<QSE NAME> <RESOURCE NAME> 1 2 9.52 50<QSE NAME> <RESOURCE NAME> 1 2 3.66 50<QSE NAME> <RESOURCE NAME> 1 2 0.16 50<QSE NAME> <RESOURCE NAME> 0 2 21.82 0<QSE NAME> <RESOURCE NAME> 0 2 3.89 0<QSE NAME> <RESOURCE NAME> 0 2 3 0<QSE NAME> <RESOURCE NAME> 0 2 1.41 0<QSE NAME> <RESOURCE NAME> 0 2 0.96 0<QSE NAME> <RESOURCE NAME> 0 2 0.55 0<QSE NAME> <RESOURCE NAME> 0 2 0.14 0<QSE NAME> <RESOURCE NAME> 0 2 0.01 0<QSE NAME> <RESOURCE NAME> 0 1 0<QSE NAME> <RESOURCE NAME> 0 1  0

6

GREDP Scenario Analysis

* April performance of frequency excluded intervals for IRRs was 90.7% (2,042/2,251). The Std Dev was 6.2 MWs.

* April performance of frequency excluded intervals for NON-IRRs was 98.9% (73,983/74,891). The Std Dev was 3.2 MWs.

NON-IRRs >= 85% < 85% % Passing 5 MW 246 54 82.00%10 MW 289 11 96.33%15 MW 298 2 99.33%5 MW - 5% 286 14 95.33%8MW - 8% (Current) 297 3 99.00%

Exclusions - No Freq Dev *

297 3 99.00%

IRRs >= 95% < 95% % Passing 3 MW 29 43 40.28%5% - 3 MW 31 41 43.06%10% - 3 MW 31 41 43.06%10% - 1 MW when BP = 0 (Current)

29 43 40.28%

Exclusions - No Freq Dev *

29 43 40.28%

Manual HDL/LDL Override Summary

QMWG

8

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 was 1 unique override in April

– As compared to 27 in March and 21 in February– The 1 override was related to issues with continuous SPS activation

9

Daily Summary Table

DateTotal Number of

OverridesNumber of Resources

with an OverrideNumber of Unique HDL/LDL Overrides

Apr 1, 2012 0 0 0Apr 2, 2012 0 0 0Apr 3, 2012 0 0 0Apr 4, 2012 0 0 0Apr 5, 2012 0 0 0Apr 6, 2012 0 0 0Apr 7, 2012 0 0 0Apr 8, 2012 0 0 0Apr 9, 2012 0 0 0

Apr 10, 2012 0 0 0Apr 11, 2012 0 0 0Apr 12, 2012 0 0 0Apr 13, 2012 0 0 0Apr 14, 2012 0 0 0Apr 15, 2012 0 0 0Apr 16, 2012 0 0 0Apr 17, 2012 0 0 0Apr 18, 2012 0 0 0Apr 19, 2012 0 0 0Apr 20, 2012 0 0 0Apr 21, 2012 0 0 0Apr 22, 2012 0 0 0Apr 23, 2012 0 0 0Apr 24, 2012 0 0 0Apr 25, 2012 0 0 0Apr 26, 2012 0 0 0Apr 27, 2012 0 0 0Apr 28, 2012 0 0 0Apr 29, 2012 0 0 0Apr 30, 2012 42 1 1