QMWG 6/8/2012

May 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

<QSE1> <RESOURCE NAME>

SCLE90 46 58 5.73 79.31

<QSE2> <RESOURCE NAME>

SCLE90 15 18 8.03 83.33

3

IRR GREDP

Resources below 95% thresholdMar-12 Apr-12 May-12

< 10 Intervals 13 19 9>=10<100 Intervals 16 4 7>=100<500 Intervals 4 9 4>=500 Intervals 10 11 11Weighted Averaged GREDP * 92.8% 91.2% 91.9%Weighted Average Deviation * 5.6MWs 5.4MWs 6.6MWsTotal Intervals 30,532 22,073 19,286* 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> 990 1,114 22.24 88.87

<QSE NAME> <RESOURCE NAME> 725 1,021 10.41 71.01

<QSE NAME> <RESOURCE NAME> 789 894 6.9 88.26

<QSE NAME> <RESOURCE NAME> 749 852 6.85 87.91

<QSE NAME> <RESOURCE NAME> 740 788 5.86 93.91

<QSE NAME> <RESOURCE NAME> 658 740 2.42 88.92

<QSE NAME> <RESOURCE NAME> 690 735 6.14 93.88

<QSE NAME> <RESOURCE NAME> 683 723 2.14 94.47

<QSE NAME> <RESOURCE NAME> 646 692 1.91 93.35

<QSE NAME> <RESOURCE NAME> 605 679 0.89 89.1

<QSE NAME> <RESOURCE NAME> 610 676 0.83 90.24

<QSE NAME> <RESOURCE NAME> 277 375 6.18 73.87

<QSE NAME> <RESOURCE NAME> 184 267 18.62 68.91

<QSE NAME> <RESOURCE NAME> 85 167 12.98 50.9

<QSE NAME> <RESOURCE NAME> 126 163 17.72 77.3

<QSE NAME> <RESOURCE NAME> 32 45 2.1 71.11

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> 33 40 4.57 82.5

<QSE NAME> <RESOURCE NAME> 28 31 3.33 90.32

<QSE NAME> <RESOURCE NAME> 14 23 6.01 60.87

<QSE NAME> <RESOURCE NAME> 17 20 8 85

<QSE NAME> <RESOURCE NAME> 18 20 7.16 90

<QSE NAME> <RESOURCE NAME> 9 12 8.92 75

<QSE NAME> <RESOURCE NAME> 2 7 1.8 28.57

<QSE NAME> <RESOURCE NAME> 3 4 15.54 75

<QSE NAME> <RESOURCE NAME> 1 3 7.84 33.33

<QSE NAME> <RESOURCE NAME> 0 2 1.16 0

<QSE NAME> <RESOURCE NAME> 1 2 6.04 50

<QSE NAME> <RESOURCE NAME> 1 2 6.94 50

<QSE NAME> <RESOURCE NAME> 0 2 2.41 0

<QSE NAME> <RESOURCE NAME> 0 1 0

<QSE NAME> <RESOURCE NAME> 0 1 

0

6

GREDP Scenario Analysis

NON-IRRs >= 85% < 85% % Passing 5 MW 257 65 79.81%10 MW 300 12 96.15%5 MW - 5% 312 10 96.89%15 MW 321 1 99.69%8MW - 8% (Current) 320 2 99.38%Exclusions - No Freq Dev 319 3 99.07%

IRRs >= 95% < 95% % Passing 10% - 1 MW when BP = 0 (Current)

24 31 43.64%

5 MW - 5% - low side - 95% 18 37 32.73%8 MW - 8% - low side - 95% 21 34 38.18%8 MW - 8% - low side - 85% 32 23 58.18%Exclusions - No Freq Dev 23 32 41.82%

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 were 8 total unique overrides in May

– As compared to 1 in April and 27 in March

9

Daily Summary Table

DateTotal Number of

OverridesNumber of Resources

with an OverrideNumber of Unique HDL/LDL Overrides

May 1, 2012 89 1 2May 2, 2012 0 0 0May 3, 2012 0 0 0May 4, 2012 0 0 0May 5, 2012 0 0 0May 6, 2012 0 0 0May 7, 2012 0 0 0May 8, 2012 0 0 0May 9, 2012 0 0 0

May 10, 2012 0 0 0May 11, 2012 0 0 0May 12, 2012 0 0 0May 13, 2012 0 0 0May 14, 2012 0 0 0May 15, 2012 0 0 0May 16, 2012 63 3 3May 17, 2012 0 0 0May 18, 2012 0 0 0May 19, 2012 0 0 0May 20, 2012 0 0 0May 21, 2012 0 0 0May 22, 2012 0 0 0May 23, 2012 0 0 0May 24, 2012 0 0 0May 25, 2012 0 0 0May 26, 2012 0 0 0May 27, 2012 0 0 0May 28, 2012 0 0 0May 29, 2012 0 0 0May 30, 2012 109 3 3May 31, 2012 0 0 0

10

Reasons for Manual HDL/LDL Overrides

• Outages required overrides as a result of local voltage issues

• Also had voltage issues resulting from a severe storm

• The following constraint had SCED executions counted towards irresolvability:

• XMOS58 : ODNTH_FMR1• This constraint has not met the

criteria for resetting the shadow price cap