PDCWGReport to ROS

Sydney Niemeyer ChairNRG Energy

Don Blackburn Vice ChairLuminant Energy

July 10, 2014

PDCWG Meeting July 1, 2014

• Reviewed June frequency control.– Improved CPS1 & 2.– Frequency Profile continues to be on the high side.

• Causes were discussed: More small high frequency “events” (small up swings in frequency). Non-conforming load MW change larger on “turn-offs” than “turn-on” would contribute to larger upswings. Must have data to prove.

• Wind turbines help with high frequency but typically not with low frequency. This keeps high frequency limited to a tighter profile on the high side.

• Two “Normal” curve profiles were suggested.– Fewer Time Error Corrections in June.

PDCWG Meeting

• BAL-001-TRE– Implementation timeline was discussed. ERCOT and

TRE will meet to confirm dates.– Resources requesting a waiver from the standard as

allowed in the standard requested the process for confirming the waiver.

– RARF additional information needed for conventional steam turbines. A revision request will be written.

– Protocol and Operating Guide revisions will be needed and are being developed.

PDCWG Meeting

• Reviewed June 21 frequency event.– RRS providers had 5 Resources with below expected

performance.– Non-RRS providers had 4 Resources with below

expected performance.• Reviewed June 7 frequency event.

– RRS providers had 2 Resources with below expected performance.

– Non-RRS providers had 9 Resources with below expected performance, poor data or inaccurate HSLs.

PDCWG Meeting

• Reviewed June 23 frequency event.– RRS providers had 4 Resources with less than

expected performance.– Non-RRS providers had 8 Resources with less than

expected performance due to either on augmented energy or errors in their HSL.

• Interconnection Primary Frequency Response was excellent during each event.– -694 MW/0.1 Hz, -847 MW/0.1 Hz and -1215

MW/0.1 Hz during the 21st, 7th and 23rd events.

PDCWG Meeting

• ERCOT will provide the PDCWG an estimate of System Inertia data in each Frequency Disturbance Report prepared for the PDCWG.

• A request for high speed frequency data on each event was requested.

“New” Future Meeting Dates

• August 21, 2014• September 10, 2014• October 7, 2014• November 11, 2014• December 2, 2014

– All meetings at the Met Center.

ERCOT Frequency Control ReportJune 2014

Sydney Niemeyer NRG EnergyJuly 1, 2014

ERCOT FREQUENCY CONTROLBAL-001 CPS 1 & 2 Performance, RMS 1 and Frequency Profile

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ERCOT CPS1 By Day -

CPS 1 Avg CPS 1 Peak Energy

June-2014

167.02ERCOT Monthly CPS1 =

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ERCOT CPS2 By Day -

CPS 2 Avg CPS 2 Peak Energy

June-2014

99.33ERCOT Monthly CPS2 =

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Interval Ending

ERCOT CPS1 15 Minute Average - Monthly Score

June-2014 167.02CPS 1 =

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ERCOT CPS1

Monthly Average 12 Month Rolling Average

CPS1 12 Month Rolling Average = 162.86

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ERCOT CPS2 Score*

CPS2

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

0.0100

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Daily RMS1 of ERCOT Frequency

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Daily RMS1 of ERCOT Frequency

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Daily RMS1 of ERCOT Frequency

60.010 <= HZ < 60.015

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Comparing June 2010 vs June 2014 profile of frequency in 5 mHz bins

Jun-10

Jun-14

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ERCOT Frequency Profile Comparison

2010 2014

January through December of each Year

ERCOT TIME ERROR AND TIME CORRECTION

Time Error History

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.

Time Error Corrections

• Four slow Time Error Corrections were executed in June.

• Other than the days with the TECs, 3 days had positive time error.

-32

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ERCOT Time Error

Daily Delta Time Error

June-2014

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ERCOT Time Error & Time Change

Time Change Time Error

July-2013June-2014

Time Correction HistoryTotal Hours on Avg Hours Avg Corrections % Time on

Year Month Days Fast Slow Count Control Per Correction Per Day CorrectionTime Corrections

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%Nov 30 0 0 0 0.00 0.00 0.00 0.0%Dec 31 0 2 2 11.50 5.75 0.06 1.5%

2014 Jan 31 0 6 6 21.75 3.63 0.19 2.9%Feb 28 0 5 5 16.50 3.30 0.18 2.5%Mar 31 0 7 7 22.00 3.14 0.23 3.0%Apr 30 0 9 9 28.00 3.11 0.30 3.9%May 31 0 11 11 35.50 3.23 0.35 4.8%Jun 30 0 4 4 12.92 3.23 0.13 1.8%Jul 31 0.00 0.0%Aug 31 0.00 0.0%Sep 30 0.00 0.0%Oct 31 0.00 0.0%Nov 30 0.00 0.0%Dec 31 0.00 0.0%

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Monthly Hours on Time Correction

Hours on Control

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sMonthly Time Correction Summary

Slow Fast

ERCOT PRIMARY FREQUENCY RESPONSE PERFORMANCE

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

ERCOT Primary Frequency Response – BAL-003-12015 Bias and Frequency Response Measure

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)

12/2/2013 16:03:54 CST -0.115 16:03:54 -0.115 -0.115 0.0 0.0 842.2 0.0 -729.4 -729.4

12/8/2013 13:07:30 CST -0.068 13:07:30 -0.068 -0.068 0.0 0.0 576.7 0.0 -842.6 -842.6

12/9/2013 8:43:12 CST -0.097 8:43:12 -0.097 -0.097 0.0 0.0 905.2 0.0 -931.6 -931.6

12/17/2013 11:45:44 CST -0.089 11:45:44 -0.089 -0.089 0.0 0.0 785.6 0.0 -881.8 -881.8

12/30/2013 9:44:22 CST -0.108 9:44:22 -0.108 -0.108 0.0 0.0 784.5 0.0 -727.4 -727.4

1/6/2014 8:10:48 CST -0.128 8:10:48 -0.128 -0.128 0.0 0.0 880.8 0.0 -685.6 -685.6

1/13/2014 4:19:44 CST -0.104 4:19:44 -0.104 -0.104 0.0 0.0 834.6 0.0 -799.3 -799.3

1/25/2014 12:07:02 CST -0.077 12:07:02 -0.088 -0.088 0.0 0.0 656.9 0.0 -746.2 -746.2

2/20/2014 21:06:54 CST -0.108 21:06:54 -0.108 -0.108 0.0 0.0 454.2 0.0 -421.4 -421.4

2/28/2014 13:25:56 CST -0.101 13:25:56 -0.101 -0.101 0.0 0.0 515.5 0.0 -512.2 -512.2

3/2/2014 7:37:40 CST -0.105 7:37:40 -0.105 -0.105 0.0 0.0 542.2 0.0 -515.8 -515.8

3/3/2014 7:31:50 CST -0.076 7:31:50 -0.076 -0.076 0.0 0.0 540.9 0.0 -707.5 -707.5

3/10/2014 18:29:28 CDT -0.099 18:29:28 -0.099 -0.099 0.0 0.0 798.2 0.0 -805.4 -805.4

3/19/2014 8:41:08 CDT -0.097 8:41:08 -0.097 -0.097 0.0 0.0 770.2 0.0 -797.4 -797.4

4/2/2014 0:33:26 CDT -0.107 0:33:26 -0.107 -0.107 0.0 0.0 470.7 0.0 -441.2 -441.2

4/29/2014 8:57:58 CDT -0.058 8:57:58 -0.058 -0.058 0.0 0.0 464.0 0.0 -804.7 -804.7

5/1/2014 15:13:50 CDT -0.100 15:13:50 -0.100 -0.100 0.0 0.0 559.1 0.0 -561.6 -561.6

5/13/2014 12:31:02 CDT 0.069 12:31:02 0.069 0.069 0.0 0.0 -420.1 0.0 -608.7 -608.7

5/15/2014 4:20:24 CDT -0.068 4:20:24 -0.068 -0.068 0.0 0.0 447.1 0.0 -655.4 -655.4

5/17/2014 0:47:26 CDT -0.062 0:47:26 -0.062 -0.062 0.0 0.0 573.6 0.0 -917.8 -917.8

6/7/2014 10:31:44 CDT -0.062 10:31:44 -0.062 -0.062 0.0 0.0 523.0 0.0 -847.2 -847.2

6/21/2014 0:58:30 CDT -0.090 0:58:30 -0.090 -0.090 0.0 0.0 625.9 0.0 -694.8 -694.8

6/23/2014 13:02:04 CDT -0.071 13:02:04 -0.071 -0.071 0.0 0.0 861.1 0.0 -1215.3 -1215.3

-732.61 2014 FRM - Average Estimated Frequency Response MW/0.1 Hz using SEFRD for R1

-701.89 2014 FRM - Regression Estimated Frequency Response MW/0.1Hz using SEFRD for R1

-729.41 2014 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

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ERCOT Total Energy

2008 2009 2010 2011 2012 2013 2014

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ERCOT Total Energy from Wind Generation

2008 2009 2010 2011 2012 2013 2014

0.00%

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16.00%

ERCOT % Energy from Wind Generation

2008 2009 2010 2011 2012 2013 2014