Electric Power Monthly

Data for November 2015  |  Release Date: January 26, 2016  |  Next Release: February 26, 2016 
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SAS Output
Table B.1 Major Disturbances and Unusual Occurrences, Year-to-Date 2015

Year Month Event Date and Time Restoration Date and Time Duration Utility/Power Pool NERC Region Area Affected Type of Disturbance Loss (megawatts) Number of Customers Affected
2015 1 01/07/2015 5:00 PM 01/08/2015 8:35 AM 15 Hours, 35 Minutes Memphis Light Gas and Water Division SERC Tennessee Public appeal to reduce the use of electricity - Severe Weather - Winter Unknown Unknown
2015 1 01/07/2015 5:00 PM 01/08/2015 8:35 AM 15 Hours, 35 Minutes Tennessee Valley Authority SERC Tennessee, Kentucky, Virginia, North Carolina, Georgia, Alabama, Missouri Public appeal to reduce the use of electricity - Severe Weather - Winter Unknown Unknown
2015 2 02/06/2015 8:58 PM . . . Hours, . Minutes Pacific Gas & Electric Co WECC Northern California Loss of electric service to more than 50,000 customers for 1 hour or more - Severe Weather - Wind Unknown 65000
2015 2 02/16/2015 9:00 PM 02/18/2015 2:00 PM 41 Hours, 0 Minutes Tennessee Valley Authority SERC Tennessee, Kentucky, Virginia, North Carolina, Georgia, Alabama, Missouri Loss of electric service to more than 50,000 customers for 1 hour or more - Severe Weather- Winter Unknown 67189
2015 2 02/16/2015 9:41 PM 02/18/2015 7:00 AM 33 Hours, 19 Minutes Southern Company SERC Northern/North Eastern, Georgia Loss of electric service to more than 50,000 customers for 1 hour or more - Severe Weather- Winter 620 186035
2015 2 02/17/2015 2:12 AM 02/18/2015 4:00 PM 37 Hours, 48 Minutes Duke Energy Carolinas SERC North Carolina, South Carolina Loss of electric service to more than 50,000 customers for 1 hour or more - Severe Weather- Winter Unknown 68000
2015 2 02/17/2015 9:00 AM 02/18/2015 11:00 PM 38 Hours, 0 Minutes Duke Energy Progress SERC North Carolina, South Carolina Loss of electric service to more than 50,000 customers for 1 hour or more - Severe Weather- Winter Unknown 52000
2015 2 02/18/2015 3:00 PM 02/20/2015 9:00 AM 42 Hours, 0 Minutes Tennessee Valley Authority SERC Tennessee, Kentucky, Virginia, North Carolina, Georgia, Alabama, Missouri Public appeal to reduce the use of electricity - Severe Weather- Winter Unknown Unknown
2015 2 02/20/2015 6:00 AM 02/20/2015 10:00 AM 4 Hours, 0 Minutes Duke Energy Progress SERC North Carolina, South Carolina System-wide voltage reductions of 3 percent or more - Severe Weather- Winter Unknown Unknown
2015 2 02/21/2015 8:34 AM 02/21/2015 12:45 PM 4 Hours, 11 Minutes Tennessee Valley Authority SERC Fentress County, Tennessee Loss of electric service to more than 50,000 customers for 1 hour or more - Severe Weather- Winter Unknown 50000
2015 2 02/26/2015 3:12 AM 02/26/2015 8:00 PM 16 Hours, 48 Minutes Duke Energy Progress SERC North Carolina, South Carolina Loss of electric service to more than 50,000 customers for 1 hour or more - Severe Weather- Winter Unknown 124000
2015 2 02/26/2015 3:30 AM 02/27/2015 12:00 PM 32 Hours, 30 Minutes Duke Energy Carolinas SERC North Carolina Loss of electric service to more than 50,000 customers for 1 hour or more - Severe Weather- Winter 400 103776
2015 3 03/15/2015 3:30 PM 03/15/2015 7:00 PM 3 Hours, 30 Minutes Portland General Electric Co WECC Greater Portland & Salem , Oregon Loss of electric service to more than 50,000 customers for 1 hour or more - Severe Weather - Wind 210 71000
2015 3 03/26/2015 3:21 PM 03/26/2015 4:59 PM 1 Hours, 38 Minutes Pacific Gas & Electric Co WECC Contra Costa County, California Electrical System Separation (Islanding) where part or parts of a power grid remain(s) operational - System Operations 15 Unknown
2015 4 04/03/2015 2:00 AM 04/03/2015 7:48 AM 5 Hours, 48 Minutes Westar Energy Inc SPP Harvey, Reno, and Sedgwick Counties, Kansas Loss of electric service to more than 50,000 customers for 1 hour or more - Severe Weather - Thunderstorms Unknown 70000
2015 4 04/06/2015 8:12 AM 04/06/2015 12:08 PM 3 Hours, 56 Minutes Pacific Gas & Electric Co WECC Butte County, California Loss of electric service to more than 50,000 customers for 1 hour or more - System Operations Unknown 80000
2015 4 04/07/2015 12:30 PM 04/07/2015 5:34 PM 5 Hours, 4 Minutes Potomac Electric Power Co RFC Unknown Uncontrolled loss of 300 Megawatts or more of firm system loads for more than 15 minutes from a single incident - System Operations Unknown Unknown
2015 4 04/07/2015 3:34 PM 04/07/2015 3:46 PM 0 Hours, 12 Minutes WAPA Sierra Nevada Region WECC California Electrical System Separation (Islanding) where part or parts of a power grid remain(s) operational - System Operations 0 0
2015 4 04/17/2015 9:16 AM 04/17/2015 11:00 AM 1 Hours, 44 Minutes Peak Reliability WECC Canada Electrical System Separation (Islanding) where part or parts of a power grid remain(s) operational - System Operations 9300 Unknown
2015 4 04/17/2015 9:30 PM 04/19/2015 11:50 PM 50 Hours, 20 Minutes CenterPoint Energy TRE Houston, Texas Loss of electric service to more than 50,000 customers for 1 hour or more - Severe Weather Unknown 280982
2015 4 04/18/2015 9:00 PM 04/21/2015 4:00 AM 55 Hours, 0 Minutes Oncor Electric Delivery Company LLC TRE Dallas, Fort Worth, Texas Loss of electric service to more than 50,000 customers for 1 hour or more - Severe Weather Unknown 89000
2015 4 04/24/2015 7:10 PM 04/26/2015 4:00 PM 44 Hours, 50 Minutes Oncor Electric Delivery Company LLC TRE Dallas, Fort Worth, Texas Loss of electric service to more than 50,000 customers for 1 hour or more - Severe Weather Unknown 57000
2015 4 04/27/2015 10:30 AM 04/28/2015 6:45 PM 32 Hours, 15 Minutes Entergy Services, Inc. SERC Louisiana and Texas Loss of electric service to more than 50,000 customers for 1 hour or more - Severe Weather Unknown 199000
2015 5 05/18/2015 3:28 PM 05/18/2015 3:47 PM 0 Hours, 19 Minutes Peak Reliability for BCHA WECC Washington Electrical System Separation (Islanding) where part or parts of a power grid remain(s) operational - Severe Weather 275 0
2015 5 05/25/2015 6:00 PM 05/29/2015 7:15 AM 85 Hours, 15 Minutes Oncor Electric Delivery Company LLC TRE North Texas Loss of electric service to more than 50,000 customers for 1 hour or more - Severe Weather Unknown 454000
2015 5 05/25/2015 8:30 PM . . . Hours, . Minutes Southwest Power Pool, Inc. SPP Texas, Louisiana, Arkansas Loss of electric service to more than 50,000 customers for 1 hour or more - Severe Weather Unknown 57351
2015 5 05/25/2015 8:30 PM 05/26/2015 6:30 PM 22 Hours, 0 Minutes American Electric Power - (SPP Reliability Region) SPP Texas Loss of electric service to more than 50,000 customers for 1 hour or more - Severe Weather Unknown 57531
2015 5 05/25/2015 10:45 PM 05/28/2015 1:25 AM 50 Hours, 40 Minutes CenterPoint Energy TRE Fort Bend County, & Harris County ,Texas Loss of electric service to more than 50,000 customers for 1 hour or more - Severe Weather Unknown 61000
2015 5 05/26/2015 5:30 AM 05/27/2015 7:00 PM 37 Hours, 30 Minutes Entergy Services, Inc. SERC Texas, Louisiana, Arkansas, Mississippi Loss of electric service to more than 50,000 customers for 1 hour or more - Severe Weather Unknown 78515
2015 6 06/01/2015 7:19 PM 06/02/2015 8:36 AM 13 Hours, 17 Minutes Pacific Gas & Electric Co WECC California Electrical System Separation (Islanding) where part or parts of a power grid remain(s) operational - System Operations 5 484
2015 6 06/02/2015 6:58 PM 06/02/2015 7:24 PM 0 Hours, 26 Minutes Pacific Gas & Electric Co WECC California Electrical System Separation (Islanding) where part or parts of a power grid remain(s) operational - System Operations 5 727
2015 6 06/03/2015 3:00 PM 06/05/2015 5:00 PM 50 Hours, 0 Minutes ERCOT TRE Texas Public appeal to reduce the use of electricity - System Operations Unknown Unknown
2015 6 06/07/2015 1:52 PM 06/07/2015 2:13 PM 0 Hours, 21 Minutes Tennessee Valley Authority SERC Tennessee Uncontrolled loss of 300 Megawatts or more of firm system loads for more than 15 minutes from a single incident - System Operations Unknown Unknown
2015 6 06/07/2015 1:54 PM 06/07/2015 2:13 PM 0 Hours, 19 Minutes Memphis Light Gas and Water Division SERC Shelby County, Tennessee Uncontrolled loss of 300 Megawatts or more of firm system loads for more than 15 minutes from a single incident and System-wide voltage reductions of 3 percent or more - System Operations 926 Unknown
2015 6 06/08/2015 12:00 AM . . . Hours, . Minutes California Department of Water Resources WECC Merced County, California Fuel supply emergencies that could impact electric power system adequacy or reliability - System Operations 176 Unknown
2015 6 06/23/2015 5:06 PM 06/26/2015 4:00 PM 70 Hours, 54 Minutes Delmarva Power & Light Company RFC New Castle County, Delaware Loss of electric service to more than 50,000 customers for 1 hour or more - Severe Weather Unknown 65000
2015 6 06/23/2015 5:30 PM 06/23/2015 7:00 PM 1 Hours, 30 Minutes Exelon Corporation / PECO RFC Delaware County, PA; Chester County, PA Loss of electric service to more than 50,000 customers for 1 hour or more - Severe Weather Unknown 200000
2015 6 06/23/2015 6:00 PM 06/30/2015 6:00 PM 168 Hours, 0 Minutes Atlantic City Electric Co RFC Gloucester County, Burlington County, Atlantic County, Cape May County, New Jersey Loss of electric service to more than 50,000 customers for 1 hour or more - Severe Weather Unknown 263000
2015 6 06/23/2015 6:18 PM 06/23/2015 8:30 PM 2 Hours, 12 Minutes PJM Interconnection RFC New Jersey Load shedding of 100 Megawatts or more implemented under emergency operational policy and Loss of electric service to more than 50,000 customers for 1 hour or more - System Operations 198 156338
2015 6 06/23/2015 6:26 PM . . . Hours, . Minutes Public Service Electric & Gas NPCC New Jersey Loss of electric service to more than 50,000 customers for 1 hour or more - Severe Weather 90 73000
2015 6 06/23/2015 6:30 PM 06/24/2015 5:00 AM 10 Hours, 30 Minutes ISO New England NPCC Connecticut, Maine, Massachusetts, New Hampshire, Rhode Island, Vermont Loss of electric service to more than 50,000 customers for 1 hour or more - Severe Weather Unknown 62442
2015 6 06/26/2015 2:00 AM . . . Hours, . Minutes Kansas City Power & Light Co SPP Kansas Loss of electric service to more than 50,000 customers for 1 hour or more - Severe Weather Unknown 110000
2015 6 06/27/2015 5:00 PM 06/30/2015 5:18 PM 72 Hours, 18 Minutes Detroit Edison Co RFC Wayne County, Michigan Loss of electric service to more than 50,000 customers for 1 hour or more - Severe Weather Unknown 68000
2015 6 06/29/2015 7:21 PM 06/29/2015 7:42 PM 0 Hours, 21 Minutes Peak Reliability WECC Washington Electrical System Separation (Islanding) where part or parts of a power grid remain(s) operational - Severe Weather 0 0
2015 6 06/30/2015 10:50 AM 07/01/2015 9:00 PM 34 Hours, 10 Minutes Pacific Gas & Electric Co WECC California Public appeal to reduce the use of electricity - Severe Weather Unknown Unknown
2015 6 06/30/2015 2:00 PM 06/30/2015 9:00 PM 7 Hours, 0 Minutes California ISO WECC California Public appeal to reduce the use of electricity - Severe Weather Unknown Unknown
2015 7 07/03/2015 5:17 PM 07/03/2015 11:30 PM 6 Hours, 13 Minutes ERCOT TRE Texas Uncontrolled loss of 300 Megawatts or more of firm system loads for more than 15 minutes from a single incident - System Operations 350 30000
2015 7 07/13/2015 2:14 PM 07/16/2015 6:00 AM 63 Hours, 46 Minutes Duke Energy Ohio Inc RFC Ohio, Kentucky Loss of electric service to more than 50,000 customers for 1 hour or more - Severe Weather 480 68339
2015 7 07/13/2015 7:40 PM 07/15/2015 12:15 PM 40 Hours, 35 Minutes American Electric Power - (RFC Reliability Region) RFC Virginia Loss of electric service to more than 50,000 customers for 1 hour or more - Severe Weather Unknown 52739
2015 7 07/14/2015 3:29 PM 07/15/2015 11:55 AM 20 Hours, 26 Minutes Entergy Services, Inc. SPP Arkansas Uncontrolled loss of 300 Megawatts or more of firm system loads for more than 15 minutes from a single incident - Severe Weather Unknown Unknown
2015 7 07/14/2015 8:00 PM 07/15/2015 9:23 AM 13 Hours, 23 Minutes Southern Company SERC Alabama Loss of electric service to more than 50,000 customers for 1 hour or more - Severe Weather 366 111644
2015 7 07/15/2015 2:00 AM 07/15/2015 2:55 AM 0 Hours, 55 Minutes California Department of Water Resources WECC California Uncontrolled loss of 300 Megawatts or more of firm system loads for more than 15 minutes from a single incident - System Operations 360 0
2015 7 07/16/2015 4:45 PM 07/16/2015 5:48 PM 1 Hours, 3 Minutes American Electric Power - (SPP Reliability Region) SPP Texas Load shedding of 100 Megawatts or more implemented under emergency operational policy - System Operations 117 17311
2015 7 07/18/2015 2:00 AM 07/19/2015 7:00 AM 29 Hours, 0 Minutes Northern States Power Co MRO Henepin and Ramsey County, Minnesota Loss of electric service to more than 50,000 customers for 1 hour or more - Severe Weather 250 250000
2015 7 07/18/2015 6:26 PM 07/18/2015 9:03 PM 2 Hours, 37 Minutes Pacific Gas & Electric Co WECC California Electrical System Separation (Islanding) where part or parts of a power grid remain(s) operational - System Operations 30 70
2015 7 07/18/2015 7:59 PM 07/18/2015 10:45 PM 2 Hours, 46 Minutes Pacific Gas & Electric Co WECC California Loss of electric service to more than 50,000 customers for 1 hour or more - Severe Weather 160 78164
2015 7 07/21/2015 12:47 PM 07/21/2015 1:12 PM 0 Hours, 25 Minutes Peak Reliability WECC Washington Load shedding of 100 Megawatts or more implemented under emergency operational policy - System Operations 200 Unknown
2015 7 07/27/2015 3:52 AM 07/27/2015 4:36 AM 0 Hours, 44 Minutes Pacific Gas & Electric Co WECC California Electrical System Separation (Islanding) where part or parts of a power grid remain(s) operational - System Operations Unknown 484
2015 7 07/28/2015 12:05 PM 07/28/2015 12:26 PM 0 Hours, 21 Minutes Puerto Rico Electric Power Authority N/A Puerto Rico System-wide voltage reductions of 3 percent or more - System Operations 150 Unknown
2015 7 07/29/2015 4:45 PM 07/29/2015 9:00 PM 4 Hours, 15 Minutes Long Island Power Authority NPCC New York Fuel supply emergencies that could impact electric power system adequacy or reliability - System Operations 500 0
2015 7 07/30/2015 9:50 AM 07/30/2015 7:00 PM 9 Hours, 10 Minutes ERCOT TRE Texas Public appeal to reduce the use of electricity - System Operations Unknown Unknown
2015 7 07/31/2015 10:55 AM . . . Hours, . Minutes Peak Reliability WECC Washington Electrical System Separation (Islanding) where part or parts of a power grid remain(s) operational - System Operations 9 0
2015 8 08/02/2015 5:45 PM 08/04/2015 3:00 AM 33 Hours, 15 Minutes Consumers Energy Co RFC Emmet County, Grand Traverse County, Leelanau County, Kalkaska County, Benzie County, Manistee County, Wexford County, Missaukee County, Mecosta County, Michigan Loss of electric service to more than 50,000 customers for 1 hour or more - Severe Weather Unknown 162000
2015 8 08/03/2015 12:30 AM 08/03/2015 2:00 AM 1 Hours, 30 Minutes Exelon Corporation / ComEd RFC Illinois Loss of electric service to more than 50,000 customers for 1 hour or more - Severe Weather Unknown 115000
2015 8 08/03/2015 1:00 AM 08/05/2015 12:00 AM 47 Hours, 0 Minutes Detroit Edison Co RFC Michigan Loss of electric service to more than 50,000 customers for 1 hour or more - Severe Weather Unknown 72520
2015 8 08/04/2015 7:17 AM 08/05/2015 12:52 PM 29 Hours, 35 Minutes ISO New England NPCC Massachusetts and Rhode Island Loss of electric service to more than 50,000 customers for 1 hour or more - Severe Weather Unknown 132000
2015 8 08/11/2015 7:30 PM 08/13/2015 4:05 AM 32 Hours, 35 Minutes CenterPoint Energy TRE Houston, Texas Loss of electric service to more than 50,000 customers for 1 hour or more - Severe Weather Unknown 100000
2015 8 08/13/2015 3:15 PM 08/13/2015 7:00 PM 3 Hours, 45 Minutes ERCOT TRE Williamson County, Texas Public appeal to reduce the use of electricity for purposes of maintaining the continuity of the electric power system - Other Unknown Unknown
2015 8 08/27/2015 9:51 PM 08/28/2015 6:00 PM 20 Hours, 9 Minutes Puerto Rico Electric Power Authority WECC Puerto Rico Uncontrolled loss of 300 Megawatts or more of firm system loads for more than 15 minutes from a single incident / Loss of electric service to more than 50,000 customers for 1 hour or more - System Operations 360 Unknown
2015 8 08/29/2015 10:00 AM . . . Hours, . Minutes Peak Reliability WECC Washington Loss of electric service to more than 50,000 customers for 1 hour or more - Severe Weather Unknown 500000
2015 8 08/29/2015 11:00 AM 09/04/2015 3:00 PM 148 Hours, 0 Minutes Puget Sound Energy WECC King County, Skagit County, Whatcom County, Kitsap County, Pierce County, Thurston County, Island County, Washington Loss of electric service to more than 50,000 customers for 1 hour or more - Severe Weather 250 250000
2015 8 08/29/2015 1:00 PM 08/31/2015 7:00 AM 42 Hours, 0 Minutes Seattle City Light WECC King County, Washington Loss of electric service to more than 50,000 customers for 1 hour or more - Severe Weather 1200 64000
2015 9 09/03/2015 2:33 AM 09/03/2015 6:25 AM 3 Hours, 52 Minutes Lansing Board of Water & Light RFC Michigan Loss of electric service to more than 50,000 customers for 1 hour or more - Severe Weather Unknown 50114
2015 9 09/20/2015 1:12 PM 09/20/2015 1:44 PM 0 Hours, 32 Minutes California ISO WECC California Load shedding of 100 Megawatts or more implemented under emergency operational policy - System Operations 150 Unknown
2015 10 10/13/2015 10:25 AM 10/13/2015 6:00 PM 7 Hours, 35 Minutes ERCOT TRE Texas Public appeal to reduce the use of electricity - Other Unknown Unknown
2015 10 10/13/2015 4:32 PM 10/13/2015 8:39 PM 4 Hours, 7 Minutes California ISO WECC California Public appeal to reduce the use of electricity - Other 41788 Unknown
2015 10 10/18/2015 7:00 AM 10/18/2015 11:29 PM 16 Hours, 29 Minutes Pacific Gas & Electric Co WECC Central Coast area, California Loss of electric service to more than 50,000 customers for 1 hour or more - Severe Weather 88 55677
2015 10 10/23/2015 9:42 AM 10/23/2015 1:26 PM 3 Hours, 44 Minutes Puerto Rico Electric Power Authority N/A Puerto Rico Electrical System Separation (Islanding) where part or parts of power grid remain(s) operational / Load shedding of 100 Megawatts or more implemented under emergency operational policy / System-wide voltage reductions of 3 percent of more / Loss of electric service to more than 50,000 customers for 1 hour or more - System Operations 500 300000
2015 10 10/31/2015 12:45 AM 11/01/2015 4:05 PM 39 Hours, 20 Minutes CenterPoint Energy TRE Harris County, Texas Loss of electric service to more than 50,000 customers for 1 hour or more - Severe Weather Unknown 130252
2015 11 11/17/2015 9:00 AM . . . Hours, . Minutes Snohomish County PUD No 1 WECC Washington: Snohomish County; Loss of electric service to more than 50,000 customers for 1 hour or more - Severe Weather 900 89000
2015 11 11/17/2015 10:00 AM . . . Hours, . Minutes Puget Sound Energy WECC Washington Loss of electric service to more than 50,000 customers for 1 hour or more - Severe Weather Unknown 300000
2015 11 11/17/2015 1:30 PM . . . Hours, . Minutes Avista Corp WECC Washington: Stevens County, Lincoln County, Adams County, Whitman County, Spokane County; Idaho: Bonner County, Kootenai County, Shoshone County, Benewah County, Idaho County; Loss of electric service to more than 50,000 customers for 1 hour or more - Severe Weather Unknown 182000
2015 11 11/21/2015 8:30 PM 11/23/2015 1:00 AM 28 Hours, 30 Minutes Detroit Edison Co RFC Michigan Loss of electric service to more than 50,000 customers for 1 hour or more - Severe Weather Unknown 60000
2015 11 11/28/2015 6:00 AM . . . Hours, . Minutes Oklahoma Gas & Electric Co SPP Oklahoma Loss of electric service to more than 50,000 customers for 1 hour or more - Severe Weather Unknown 35000
2015 11 11/28/2015 6:00 AM 11/30/2015 1:00 PM 55 Hours, 0 Minutes Southwest Power Pool, Inc. SPP Oklahoma Loss of electric service to more than 50,000 customers for 1 hour or more - Severe Weather Unknown 55609
2015 11 11/29/2015 4:48 PM 11/29/2015 6:20 PM 1 Hours, 32 Minutes Puerto Rico Electric Power Authority N/A Puerto Rico System-wide voltage reductions of 3 percent or more - System Operations 0 0
2015 11 11/30/2015 6:18 AM 11/30/2015 9:18 PM 15 Hours, 0 Minutes Puerto Rico Electric Power Authority N/A Puerto Rico System-wide voltage reductions of 3 percent or more - System Operations 100 86559

Note: Customers affected are estimates and are preliminary.
Source: Form OE-417, 'Electric Emergency Incident and Disturbance Report.'