PDCWGReport to ROS

David Kee Chair

CPS Energy

Sydney Niemeyer Vice Chair

NRG Energy

October Meeting

• Met Oct 22, 2013– 18 members representing 14 companies as

well as ERCOT & TRE.

• NPRR 486/ SCR 773 – update

• NPRR 568 & 573

• Event review

• GREDP update

• Frequency Control Report Oct 2013– Significant Control Event

NPRR 486/ SCR 773 update

• Focus on development of metrics to track the regulation bias

• Generator Startup process is likely next to be reviewed

• Integral ACE was discussed as a candidate for control feedback to SCED

• There was a consensus that the method recommended by NPRR 486 will not work. NPRR is likely to be withdrawn.

NPRR 568 & 573

• NPRR 568 was reviewed and it was determined that the proposed revisions do not impact reliability. – Questions were raised

• “will the incentives align with ERCOT operator actions?”• “what is an emergency condition based on?”

• NPRR 573 was submitted by ERCOT to address issues indirectly raised by NPRR 568.– PDCWG submitted comments to NPRR 573

Event Review

• PDCWG Reviewed 4 events– Event resulted in good system frequency

performance with few poor performers identified

– Non Frequency responsive RRS providers were noted and ERCOT will follow up with QSEs regarding their performance

GREDP

• All Conventional Generators passed metric

• Increase in Wind Resource control performance– With CREZ lines being energized there are

less curtailments– Scores have stayed consistent– Signals better control of Wind Resources that

are being curtailed

Focus for 2013 Formal & documented review/report of frequency responsiveness for Power

Augmentation on Combined Cycle Resources (train not individual unit) Review regulation/GTBD deployment effectiveness (SCR 773)

– Study the impact of HSL/basepoint/generation deviation on compliance and reliability

– Develop metrics to track regulation deployment effectiveness

• Pilot of fast frequency response – characterize & create evaluation process• Fast Responding Regulation – NPRR581 (new)• Ancillary Service Overhaul

– No performance required for nonpayment (freq. resp AS)

• Responsive Reserve requirements, qualification vs. compliance. (10min vs. 16 second)• Standardized/consistent metrics for PFR analysis (BAL001-TRE).

– Work on realistic measurement of combined cycles

• Standardized/reasonable expectations for extreme events (2750MW or larger lost) – driven by NERC.

• ERS impact review with appropriate ERCOT group. Target Q1-2014• PMU data understanding of implications

• Red = Work on going Check = completed goal

ERCOT Frequency Control Report

October 2013Sydney Niemeyer NRG Energy

November 11, 2013

Notes

• Time error values from NRG True Time device can be slightly different from ERCOT’s Time Error but the daily delta times should be accurate.

ERCOT FREQUENCY CONTROL

BAL-001 CPS 1 & 2 Performance, RMS 1 and Frequency Profile

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31500

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42000

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66500

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ERCOT CPS1 By Day -

CPS 1 Avg CPS 1 Peak Energy

October-2013

162.00ERCOT Monthly CPS1 =

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31500

35000

38500

42000

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66500

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80%

82%

84%

86%

88%

90%

92%

94%

96%

98%

100%

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31

ER

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ERCOT CPS2 By Day -

CPS 2 Avg CPS 2 Peak Energy

October-2013

99.01ERCOT Monthly CPS2 =

100

110

120

130

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160

170

100

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130

140

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170

CP

S1

Ave

rag

e

ERCOT CPS1

Monthly Average 12 Month Rolling Average

CPS1 12 Month Rolling Average = 166.79

70

75

80

85

90

95

100

CP

S2

Month

ERCOT CPS2 Score*

CPS2

*ERCOT as a single control area is exempt from CPS2. These scores are For Information Only

0.0100

0.0150

0.0200

0.0250

0.0300

0.0350

0.0400

0.0450

0.0500

Daily RMS1 of ERCOT Frequency

0.0100

0.0150

0.0200

0.0250

0.0300

0.0350

0.0400

0.0450

0.0500

Daily RMS1 of ERCOT Frequency

0.0100

0.0150

0.0200

0.0250

0.0300

0.0350

0.0400

0.0450

0.0500

Daily RMS1 of ERCOT Frequency

0

0.02

0.04

0.06

0.08

0.1

0.12

Comparing October 2010 vs October 2013 profile of frequency in 5 mHz bins

Oct-10

Oct-13

60.015 <= HZ < 60.020

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ERCOT Frequency Profile Comparison

2010 2013

January through December of each Year

ERCOT TIME ERROR AND TIME CORRECTION

Time Error History

Time Error Corrections

• Fourth consecutive month with no manual Time Error Correction.

• Prior to July 2013 there have been 3 months with no manual Time Error Corrections. This is between Sept 2001 and June 2013, almost 12 years.– One in 2004, 2009 and 2011.

-32

-28

-24

-20

-16

-12

-8

-4

0

-2.0

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-0.5

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0.5

1.0

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ERCOT Time Error

Daily Delta Time Error

October-2013

-40

-32

-24

-16

-8

0

8

16

24

32

40

-10

-8

-6

-4

-2

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10

Nov Dec Jan Feb Mar Apr May Jun Jul Aug Sep Oct

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ERCOT Time Error & Time Change

Time Change Time Error

November-2012

October-2013

October-2013

7

39.5

75.83

109.83

149.33

180.08

210.58

234.58

254.58

272.58

296.58

325.08

2.5

32.542

60

77.5 8391.5

104 104 104 104 104

0

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350

November December January February March April May June July August September October

HOURS

Monthly Cumulative TEC Monthly TEC Hours (Nov 2011 to Oct 2012) Monthly TEC Hours (Nov 2012 to August 2013)

Time Correction History

Total Hours on Avg Hours Avg Corrections % Time onYear Month Days Fast Slow Count Control Per Correction Per Day Correction

Time Corrections

2012 Jan 31 0 12 12 36.33 3.03 0.39 4.9%Feb 29 0 12 12 34.00 2.83 0.41 4.9%Mar 31 0 15 15 42.50 2.83 0.48 5.7%Apr 30 0 11 11 30.75 2.80 0.37 4.3%May 31 0 11 11 30.50 2.77 0.35 4.1%Jun 30 0 8 8 24.00 3.00 0.27 3.3%Jul 31 0 7 7 20.00 2.86 0.23 2.7%Aug 31 0 7 7 18.00 2.57 0.23 2.4%Sep 30 0 9 9 24.00 2.67 0.30 3.3%Oct 31 0 10 10 28.50 2.85 0.32 3.8%Nov 30 0 1 1 2.50 2.50 0.03 0.3%Dec 31 0 10 10 30.00 3.00 0.32 4.0%

2013 Jan 31 0 3 3 9.50 3.17 0.10 1.3%Feb 28 0 6 6 18.00 3.00 0.21 2.7%Mar 31 0 5 5 17.50 3.50 0.16 2.4%Apr 30 0 1 1 5.50 5.50 0.03 0.8%May 31 0 2 2 8.50 4.25 0.06 1.1%Jun 30 0 3 3 12.50 4.17 0.10 1.7%Jul 31 0 0 0 0.00 0.00 0.00 0.0%Aug 31 0 0 0 0.00 0.00 0.00 0.0%Sep 30 0 0 0 0.00 0.00 0.00 0.0%Oct 31 0 0 0 0.00 0.00 0.00 0.0%

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2001 2002 2003 2004 2005 2006 2007 2008 2009 2010 2011 2012 2013

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Monthly Hours on Time Correction

Hours on Control

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2001 2002 2003 2004 2005 2006 2007 2008 2009 2010 2011 2012 2013

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Monthly Time Correction Summary

Slow Fast

ERCOT PRIMARY FREQUENCY RESPONSE PERFORMANCE

BAL-003-1 Interconnection Frequency Response and Bias Measure.

ERCOT Primary Frequency Response – BAL-003-1

2014 Bias and Frequency Response Measure Page 1

Date/Time (t-0) BA BA BA Relay Lmt Value "A" Information Value "B" Information SEFRD (FRM)Time Bias R1 for Bias for R1

BA Time Zone DelFreq Time DelFreq DelFreq MW/Load Lost Adjustment MW/Load Lost Adjustment (MW/0.1Hz) (MW/0.1Hz)

12/10/2012 12:32:54 CST -0.076 12:32:54 -0.076 -0.076 0.0 0.0 790.9 0.0 -1042.1 -1042.1

12/12/2012 7:31:10 CST -0.093 7:31:10 -0.093 -0.093 0.0 0.0 641.6 0.0 -690.4 -690.4

12/25/2012 4:30:20 CST -0.134 4:30:20 -0.134 -0.134 0.0 0.0 912.6 100.0 -604.5 -604.5

1/2/2013 14:41:26 CST -0.134 14:41:26 -0.134 -0.134 0.0 0.0 827.4 0.0 -618.9 -618.9

1/13/2013 20:35:06 CST -0.111 20:35:06 -0.111 -0.111 0.0 0.0 810.1 0.0 -730.6 -730.6

1/15/2013 10:04:14 CST -0.158 10:04:14 -0.158 -0.158 0.0 0.0 740.0 0.0 -468.5 -468.5

1/19/2013 23:10:16 CST -0.088 23:10:16 -0.088 -0.088 0.0 0.0 714.6 0.0 -816.1 -816.1

1/22/2013 16:06:24 CST -0.076 16:06:24 -0.076 -0.076 0.0 0.0 857.0 80.0 -1028.7 -1028.7

3/4/2013 21:47:48 CST -0.146 21:47:48 -0.146 -0.146 0.0 0.0 595.0 0.0 -406.8 -406.8

3/7/2013 17:05:56 CST -0.085 17:05:56 -0.085 -0.085 0.0 0.0 781.1 0.0 -914.0 -914.0

3/15/2013 18:39:50 CDT -0.086 18:39:50 -0.086 -0.086 0.0 0.0 528.9 0.0 -615.2 -615.2

3/18/2013 17:21:22 CDT -0.082 17:21:22 -0.082 -0.082 0.0 0.0 494.6 0.0 -603.8 -603.8

4/2/2013 21:25:34 CDT -0.098 21:25:34 -0.098 -0.098 0.0 0.0 758.2 0.0 -770.3 -770.3

4/9/2013 18:21:40 CDT -0.073 18:21:40 -0.073 -0.073 0.0 0.0 758.5 0.0 -1037.2 -1037.2

4/23/2013 11:19:30 CDT -0.063 11:19:30 -0.063 -0.063 0.0 0.0 469.1 0.0 -739.1 -739.1

4/29/2013 13:59:14 CDT -0.126 13:59:14 -0.126 -0.126 0.0 0.0 522.1 0.0 -413.1 -413.1

5/7/2013 3:07:26 CDT -0.120 3:07:26 -0.120 -0.120 0.0 0.0 504.8 0.0 -422.1 -422.1

5/11/2013 20:13:48 CDT -0.089 20:13:48 -0.089 -0.089 0.0 0.0 392.0 0.0 -438.8 -438.8

5/17/2013 13:38:22 CDT -0.052 13:38:22 -0.052 -0.052 0.0 0.0 473.1 0.0 -902.7 -902.7

5/22/2013 16:11:30 CDT -0.151 16:11:30 -0.151 -0.151 0.0 0.0 846.0 0.0 -559.6 -559.6

5/29/2013 23:47:34 CDT -0.109 23:47:34 -0.109 -0.109 0.0 0.0 716.3 0.0 -655.6 -655.6

5/30/2013 14:46:22 CDT -0.125 14:46:20 -0.125 -0.125 0.0 0.0 784.2 0.0 -629.5 -629.5

6/4/2013 18:04:26 CDT -0.094 18:04:26 -0.094 -0.094 0.0 0.0 606.4 0.0 -644.8 -644.8

6/11/2013 10:56:36 CDT -0.146 10:56:36 -0.146 -0.146 0.0 0.0 910.0 0.0 -625.0 -625.0

6/12/2013 19:45:22 CDT -0.128 19:45:22 -0.128 -0.128 0.0 0.0 825.4 0.0 -642.4 -642.4

6/25/2013 18:47:46 CDT -0.075 18:47:46 -0.075 -0.075 0.0 0.0 451.0 0.0 -601.5 -601.5

6/26/2013 23:09:56 CDT -0.119 23:09:56 -0.119 -0.119 0.0 0.0 804.4 0.0 -675.2 -675.2

7/21/2013 18:00:50 CDT -0.119 18:00:50 -0.119 -0.119 0.0 0.0 599.2 0.0 -501.9 -501.9

ERCOT Primary Frequency Response – BAL-003-1

2014 Bias and Frequency Response Measure – Page 2

Date/Time (t-0) BA BA BA Relay Lmt Value "A" Information Value "B" Information SEFRD (FRM)Time Bias R1 for Bias for R1

BA Time Zone DelFreq Time DelFreq DelFreq MW/Load Lost Adjustment MW/Load Lost Adjustment (MW/0.1Hz) (MW/0.1Hz)

7/25/2013 1:15:52 CDT -0.087 1:15:52 -0.087 -0.087 0.0 0.0 827.3 0.0 -953.4 -953.4

8/2/2013 15:35:08 CDT -0.122 15:35:08 -0.122 -0.122 0.0 0.0 916.6 0.0 -753.2 -753.2

8/11/2013 5:43:36 CDT -0.104 5:43:36 -0.104 -0.104 0.0 0.0 827.5 0.0 -792.1 -792.1

8/12/2013 2:58:06 CDT -0.075 2:58:06 -0.075 -0.075 0.0 0.0 783.3 0.0 -1045.3 -1045.3

8/18/2013 16:45:34 CDT -0.108 16:45:34 -0.108 -0.108 0.0 0.0 605.8 0.0 -562.6 -562.6

8/20/2013 14:19:12 CDT -0.084 14:19:12 -0.084 -0.084 0.0 0.0 601.4 0.0 -719.5 -719.5

8/24/2013 18:46:10 CDT -0.082 18:46:10 -0.082 -0.082 0.0 0.0 563.1 0.0 -689.3 -689.3

8/29/2013 18:55:24 CDT -0.059 18:55:24 -0.059 -0.059 0.0 0.0 804.4 0.0 -1360.4 -1360.4

9/3/2013 15:25:10 CDT -0.090 15:25:10 -0.090 -0.090 0.0 0.0 604.9 0.0 -675.3 -675.3

9/25/2013 9:17:30 CDT -0.103 9:17:30 -0.103 -0.103 0.0 0.0 717.8 0.0 -698.9 -698.9

10/8/2013 11:56:08 CDT -0.071 11:56:08 -0.071 -0.071 0.0 0.0 460.8 0.0 -647.3 -647.3

10/12/2013 20:23:26 CDT -0.059 20:23:26 -0.059 -0.059 0.0 0.0 547.9 0.0 -921.5 -921.5

-715.42 2013 FRM - Average Estimated Frequency Response MW/0.1 Hz using SEFRD for R1

-648.28 2013 FRM - Regression Estimated Frequency Response MW/0.1Hz using SEFRD for R1

-675.24 2013 FRM - Median Estimated Frequency Response MW/0.1Hz for BA Compliance to R1, minimum Frequency Response

ERCOT TOTAL ENERGY AND WIND PRODUCTION

October Total ERCOT Energy and Total Energy Production from Wind Resources.

0

5,000,000

10,000,000

15,000,000

20,000,000

25,000,000

30,000,000

35,000,000

40,000,000

45,000,000

MW

H

ERCOT Total Energy

2008 2009 2010 2011 2012 2013

0

500,000

1,000,000

1,500,000

2,000,000

2,500,000

3,000,000

3,500,000

4,000,000

MW

HERCOT Total Energy from Wind Generation

2008 2009 2010 2011 2012 2013

0.00%

2.00%

4.00%

6.00%

8.00%

10.00%

12.00%

14.00%

16.00%

ERCOT % Energy from Wind Generation

2008 2009 2010 2011 2012 2013

Questions?