QMWG 3/2/2012

February 2012 Generation Resource Energy and Regulation Deployment Performance

2

NON-IRR GREDP – Energy Deployments

* Resource was testing and used a resource status that caused it to be scored for GREDP

Resources below 85% threshold

QSE Name Resource Name Fuel Type Total Intervals Passed Total Intervals Scored Std Dev(GREDP MW) GREDP Monthly Score<QSE NAME> <RESOURCE NAME> SCLE90 10 13 8.15 76.92<QSE NAME> <RESOURCE NAME> SCLE90 5 6 5.48 83.33<QSE NAME> <RESOURCE NAME> * SCGT90 11 15 73.80 73.33

3

NON-IRR GREDP – Energy Deployments

Interval Total Intervals Passed Total Intervals Scored Std Dev(GREDP MW) GREDP Monthly Score06:10:00 2,737 2,810 7.46 97.4006:05:00 2,998 3,069 9.28 97.6906:15:00 2,606 2,657 6.49 98.0806:00:00 3,553 3,622 6.88 98.0922:10:00 2,957 3,007 7.34 98.34

Bottom intervals by score

Bottom intervals by errorInterval Total Intervals Passed Total Intervals Scored Std Dev(GREDP MW) GREDP Monthly Score

10:45:00 3,229 3,241 10.93 99.6310:35:00 3,365 3,373 10.92 99.7606:05:00 2,998 3,069 9.28 97.6900:10:00 2,618 2,651 8.30 98.7606:10:00 2,737 2,810 7.46 97.40

4

NON-IRR GREDP – Regulation Deployments

Bottom 10 Resources during Regulation intervalsQSE Name Resource Name Fuel Type Total Intervals Passed Total Intervals Scored Std Dev(GREDP MW) GREDP Monthly Score

<QSE NAME>

<RESOURCE NAME> SCLE90 8 9 6.09 88.89

<QSE NAME>

<RESOURCE NAME> SCLE90 19 20 2.36 95.00

<QSE NAME>

<RESOURCE NAME> GSSUP 594 621 5.42 95.65

<QSE NAME>

<RESOURCE NAME> CC 1,844 1,923 6.91 95.89

<QSE NAME>

<RESOURCE NAME> CLLIG 4,870 5,057 2.85 96.30

<QSE NAME>

<RESOURCE NAME> CLLIG 4,813 4,997 2.85 96.32

<QSE NAME>

<RESOURCE NAME> CLLIG 451 464 4.56 97.20

<QSE NAME>

<RESOURCE NAME> CC 175 180 8.50 97.22

<QSE NAME>

<RESOURCE NAME> CC 2,908 2,982 3.18 97.52

<QSE NAME>

<RESOURCE NAME> CC 1,009 1,034 2.86 97.58

Bottom intervals by score

Interval Total Intervals Passed Total Intervals Scored Std Dev(GREDP MW) GREDP Monthly Score06:05:00 608 635 8.40 95.7506:10:00 574 592 7.18 96.9605:05:00 463 477 9.37 97.0605:10:00 472 484 6.02 97.5200:15:00 361 370 8.37 97.57

Bottom intervals by error

Interval Total Intervals Passed Total Intervals Scored Std Dev(GREDP MW) GREDP Monthly Score21:05:00 454 461 9.55 98.4805:05:00 463 477 9.37 97.0602:20:00 354 358 9.13 98.8808:05:00 522 527 8.59 99.0508:10:00 495 498 8.52 99.40

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IRR GREDP

Resources below 95% thresholdDec-11 Jan-12 Feb-12

< 10 Intervals 9 2 8

>=10<100 Intervals 16 7 12

>=100<500 Intervals 13 2 5

>=500 Intervals 7 14 6

Weighted Averaged GREDP * 88.9% 92.0% 94.4%

Weighted Average Deviation * 10.8MWs 6.38MWs 5.1MWs

Total Intervals * 13,128 29,221 27,632

* Includes all WGRs (not just failures)

Interval Intervals Passed

Intervals Scored Std Dev GREDP Score

09:00:00 74 90 5.88 82.2219:05:00 45 54 14.69 83.3319:10:00 52 62 14.90 83.8722:45:00 102 119 7.32 85.7120:15:00 103 120 4.07 85.83

Bottom intervals by score

Bottom intervals by errorInterval Intervals

PassedIntervals Scored Std Dev GREDP Score

05:30:00 59 61 15.58 96.7219:00:00 42 45 15.19 93.3311:15:00 42 47 15.06 89.3610:50:00 30 31 14.90 96.7719:10:00 52 62 14.90 83.87

6

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 3 2.31 33.33<QSE NAME> <RESOURCE NAME> 2,273 2,402 2.20 94.63<QSE NAME> <RESOURCE NAME> 73 83 18.50 87.95<QSE NAME> <RESOURCE NAME> 152 162 10.55 93.83<QSE NAME> <RESOURCE NAME> 49 66 8.77 74.24<QSE NAME> <RESOURCE NAME> 1 13 13.73 7.69<QSE NAME> <RESOURCE NAME> 0 18 8.55 0.00<QSE NAME> <RESOURCE NAME> 0 19 4.99 0.00<QSE NAME> <RESOURCE NAME> 30 36 8.17 83.33<QSE NAME> <RESOURCE NAME> 25 27 3.92 92.59<QSE NAME> <RESOURCE NAME> 0 2 0.18 0.00<QSE NAME> <RESOURCE NAME> 4 5 3.55 80.00<QSE NAME> <RESOURCE NAME> 31 37 1.30 83.78<QSE NAME> <RESOURCE NAME> 181 191 7.67 94.76<QSE NAME> <RESOURCE NAME> 0 3 4.31 0.00<QSE NAME> <RESOURCE NAME> 14 57 7.84 24.56<QSE NAME> <RESOURCE NAME> 423 458 5.03 92.36<QSE NAME> <RESOURCE NAME> 3 8 3.91 37.50<QSE NAME> <RESOURCE NAME> 6 9 0.89 66.67<QSE NAME> <RESOURCE NAME> 6 10 16.03 60.00<QSE NAME> <RESOURCE NAME> 509 596 1.43 85.40<QSE NAME> <RESOURCE NAME> 1 2 0.17 50.00<QSE NAME> <RESOURCE NAME> 856 944 12.44 90.68<QSE NAME> <RESOURCE NAME> 589 881 4.17 66.86<QSE NAME> <RESOURCE NAME> 890 1,044 4.74 85.25<QSE NAME> <RESOURCE NAME> 3 10 8.80 30.00<QSE NAME> <RESOURCE NAME> 657 756 12.10 86.90<QSE NAME> <RESOURCE NAME> 15 17 5.07 88.24<QSE NAME> <RESOURCE NAME> 215 232 6.78 92.67<QSE NAME> <RESOURCE NAME> 7 8 1.61 87.50<QSE NAME> <RESOURCE NAME> 155 170 4.64 91.18

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GREDP Scenario Analysis

* January performance of frequency excluded intervals for IRRs was 91.4% (2184 passed/2389 scored). The Std Dev was 5.3 MWs.

IRRs >= 95% < 95% % Passing 0% - 3 MW Band 35 32 52.2%5% - 3 MW Band 37 30 55.2%10% - 3MW Band 43 24 64.2%10% - 1 MW Band when BP = 0 (Current) 36 31 53.7%Exclusions - No Freq Dev * 35 32 52.2%

* January performance of frequency excluded intervals for NON-IRRs was 99% (74406 passed/75123 scored). The Std Dev was 2.98 MWs.

NON-IRRs >= 85% < 85% % Passing 5 MW 195 46 81.0%10 MW 197 44 81.7%15 MW 238 3 98.8%5 MW - 5% 231 10 95.9%8MW - 8% (Current) 238 3 98.8%Exclusions - No Freq Dev * 238 3 98.8%

Manual HDL/LDL Override Summary

QMWG

9

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 21 total unique overrides in February

– As compared to 13 in January and 13 in December

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Daily Summary Table

DateTotal Number of

OverridesNumber of Resources

with an OverrideNumber of Unique HDL/LDL Overrides

Feb 1, 2012 0 0 0Feb 2, 2012 256 4 4Feb 3, 2012 600 10 16Feb 4, 2012 0 0 0Feb 5, 2012 0 0 0Feb 6, 2012 0 0 0Feb 7, 2012 0 0 0Feb 8, 2012 0 0 0Feb 9, 2012 0 0 0

Feb 10, 2012 0 0 0Feb 11, 2012 0 0 0Feb 12, 2012 0 0 0Feb 13, 2012 0 0 0Feb 14, 2012 0 0 0Feb 15, 2012 0 0 0Feb 16, 2012 0 0 0Feb 17, 2012 0 0 0Feb 18, 2012 0 0 0Feb 19, 2012 0 0 0Feb 20, 2012 2 1 1Feb 21, 2012 0 0 0Feb 22, 2012 0 0 0Feb 23, 2012 0 0 0Feb 24, 2012 0 0 0Feb 25, 2012 0 0 0Feb 26, 2012 0 0 0Feb 27, 2012 0 0 0Feb 28, 2012 0 0 0Feb 29, 2012 0 0 0

              

11

Reasons for Manual HDL/LDL Overrides

• An override is considered unique if that same Resource did not have an override within the last 10 minutes

• The “Other” reason given was QSE requested testing

• Congestion concerns were a result of inaccurate Resource telemetry