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Electric Power Monthly

Data for December 2020 Release Date: February 24, 2021 Next Release Date: March 24, 2021 full reportPDF
SAS Output
Table B.1 Major Disturbances and Unusual Occurrences, Year-to-Date 2020

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
2020 1 01/09/2020 11:07 PM 01/09/2020 11:18 PM 0 Hours, 11 Minutes Entergy Transmission Control Center - South SPP RE Arkansas: Electrical System Separation (Islanding) where part or parts of power grid remain(s) operational in an otherwise blacked out area or within the partial failure of an integrated electrical system.-System Operations Unknown Unknown
2020 1 01/09/2020 11:07 PM 01/09/2020 11:19 PM 0 Hours, 12 Minutes Entergy - Transmission Operations Engineering SPP RE Arkansas: Yell County; Unexpected Transmission loss within its area, contrary to design, of three or more Bulk Electric System Facilities caused by a common disturbance (excluding successful automatic reclosing).-Severe Weather/Transmission Interruption 0 0
2020 1 01/11/2020 2:25 AM 01/11/2020 7:56 AM 5 Hours, 31 Minutes Entergy - Transmission Operations Engineering SPP RE Arkansas: Cross County; Unexpected Transmission loss within its area, contrary to design, of three or more Bulk Electric System Facilities caused by a common disturbance (excluding successful automatic reclosing).-Severe Weather/Transmission Interruption 22 7541
2020 1 01/11/2020 3:30 AM 01/11/2020 5:30 PM 14 Hours, 0 Minutes Entergy Corp SPP RE Arkansas: Texas: Loss of electric service to more than 50,000 customers for 1 hour or more.-Severe Weather Unknown 68138
2020 1 01/11/2020 12:50 PM 01/12/2020 1:33 PM 24 Hours, 43 Minutes Southern Company SERC Alabama: Georgia: Mississippi: Loss of electric service to more than 50,000 customers for 1 hour or more.-Severe Weather 219 30715
2020 1 01/11/2020 1:20 PM . . . Hours, . Minutes Tennessee Valley Authority SERC Tennessee: Electrical System Separation (Islanding) where part or parts of power grid remain(s) operational in an otherwise blacked out area or within the partial failure of an integrated electrical system.-Severe Weather 4 Unknown
2020 1 01/11/2020 11:02 PM 01/12/2020 2:01 AM 2 Hours, 59 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 Unknown 66475
2020 1 01/17/2020 5:28 AM 01/17/2020 10:13 AM 4 Hours, 45 Minutes Pacific Gas & Electric Co WECC California: Humboldt County; Electrical System Separation (Islanding) where part or parts of power grid remain(s) operational in an otherwise blacked out area or within the partial failure of an integrated electrical system.-Severe Weather/Transmission Interruption 87 67864
2020 1 01/24/2020 4:34 AM . . . Hours, . Minutes California Department of Water Resources WECC California: Fuel supply emergencies that could impact electric power system adequacy or reliability.-Fuel Supply Deficiency 0 0
2020 1 01/30/2020 3:01 AM 01/30/2020 4:36 AM 1 Hours, 35 Minutes Western Area Power Administration - Upper Great Plains Region MRO North Dakota: Burleigh County; Unexpected Transmission loss within its area, contrary to design, of three or more Bulk Electric System Facilities caused by a common disturbance (excluding successful automatic reclosing).-Transmission Interruption 75 0
2020 2 02/06/2020 1:30 PM 02/07/2020 8:08 PM 30 Hours, 38 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/Transmission Interruption Unknown 89500
2020 2 02/06/2020 2:29 PM 02/07/2020 12:44 PM 22 Hours, 15 Minutes Duke Energy Progress SERC North Carolina: Loss of electric service to more than 50,000 customers for 1 hour or more.-Severe Weather/Distribution Interruption Unknown 284256
2020 2 02/07/2020 8:48 AM . . . Hours, . Minutes Dominion Energy VA SERC Virginia: North Carolina: Loss of electric service to more than 50,000 customers for 1 hour or more.-Severe Weather Unknown 87000
2020 2 02/07/2020 11:00 AM . . . Hours, . Minutes Exelon Corporation/PECO RF Pennsylvania: Loss of electric service to more than 50,000 customers for 1 hour or more.-Severe Weather/Distribution Interruption Unknown 52000
2020 2 02/07/2020 2:42 PM 02/10/2020 9:25 AM 66 Hours, 43 Minutes Niagara Mohawk Power Corporation (dba National Grid) NPCC New York: Loss of electric service to more than 50,000 customers for 1 hour or more.-Severe Weather Unknown 7500
2020 2 02/07/2020 4:25 PM 02/08/2020 12:00 PM 19 Hours, 35 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 123359
2020 2 02/09/2020 9:30 AM 02/09/2020 9:40 PM 12 Hours, 10 Minutes Pacific Gas & Electric Co WECC California: Alameda County, Contra Costa County, El Dorado County, Nevada County, Placer County, Sierra County, Santa Clara County, Napa County, Marin County, Santa Cruz County; Loss of electric service to more than 50,000 customers for 1 hour or more.-Severe Weather 500 145000
2020 2 02/11/2020 7:13 AM 02/11/2020 4:00 PM 8 Hours, 47 Minutes Portland General Electric Co WECC Oregon: Clackamas County; Unexpected Transmission loss within its area, contrary to design, of three or more Bulk Electric System Facilities caused by a common disturbance (excluding successful automatic reclosing).-Transmission Interruption Unknown 0
2020 2 02/17/2020 4:00 AM . . . Hours, . Minutes Pacific Gas & Electric Co WECC Northern and Central California; Loss of electric service to more than 50,000 customers for 1 hour or more.-Severe Weather 91 70000
2020 3 03/01/2020 8:00 AM . . . Hours, . Minutes Somerset Operating Company NPCC Western NY Fuel supply emergencies that could impact electric power system adequacy or reliability.-Fuel Supply Deficiency 675 Unknown
2020 3 03/01/2020 11:27 AM 03/01/2020 9:47 PM 10 Hours, 20 Minutes Entergy - Transmission Operations Engineering SERC Mississippi: Rankin County; Unexpected Transmission loss within its area, contrary to design, of three or more Bulk Electric System Facilities caused by a common disturbance (excluding successful automatic reclosing).-Transmission Interruption 19 3136
2020 3 03/12/2020 1:03 AM 03/12/2020 3:00 AM 1 Hours, 57 Minutes PECO Energy Co RF Pennsylvania: Unexpected Transmission loss within its area, contrary to design, of three or more Bulk Electric System Facilities caused by a common disturbance (excluding successful automatic reclosing).-Transmission Interruption 40 15864
2020 3 03/16/2020 12:01 PM 03/16/2020 1:10 PM 1 Hours, 9 Minutes Pacific Gas & Electric Co WECC California: Loss of electric service to more than 50,000 customers for 1 hour or more.-Severe Weather 165 110800
2020 3 03/18/2020 7:09 AM . . . Hours, . Minutes Pacificorp WECC Utah: Loss of electric service to more than 50,000 customers for 1 hour or more.-Natural Disaster 237 73000
2020 3 03/24/2020 2:55 AM 03/24/2020 6:50 AM 3 Hours, 55 Minutes ISO New England NPCC Connecticut: Massachusetts: Maine: New Hampshire: Rhode Island: Vermont: Loss of electric service to more than 50,000 customers for 1 hour or more.-Severe Weather Unknown 51026
2020 3 03/26/2020 9:29 PM 03/26/2020 9:47 PM 0 Hours, 18 Minutes FirstEnergy Corp RF Ohio: Unexpected Transmission loss within its area, contrary to design, of three or more Bulk Electric System Facilities caused by a common disturbance (excluding successful automatic reclosing).-Transmission Interruption 19 11964
2020 3 03/29/2020 8:27 PM 03/29/2020 11:04 PM 2 Hours, 37 Minutes Entergy - Transmission Operations Engineering SERC Mississippi: Panola County; Unexpected Transmission loss within its area, contrary to design, of three or more Bulk Electric System Facilities caused by a common disturbance (excluding successful automatic reclosing).-Transmission Interruption 4 1558
2020 3 03/31/2020 11:45 AM 03/31/2020 8:00 PM 8 Hours, 15 Minutes Southern Company SERC Alabama: Georgia: Loss of electric service to more than 50,000 customers for 1 hour or more.-Severe Weather 412 57744
2020 4 04/02/2020 1:37 PM 04/02/2020 2:43 PM 1 Hours, 6 Minutes Nebraska Public Power District MRO Nebraska: York County; Unexpected Transmission loss within its area, contrary to design, of three or more Bulk Electric System Facilities caused by a common disturbance (excluding successful automatic reclosing).-Transmission Interruption 5 Unknown
2020 4 04/05/2020 3:46 PM 04/05/2020 5:35 PM 1 Hours, 49 Minutes Pacific Gas & Electric Co WECC California: Stanislaus County; Electrical System Separation (Islanding) where part or parts of power grid remain(s) operational in an otherwise blacked out area or within the partial failure of an integrated electrical system.-Severe Weather 7 6814
2020 4 04/07/2020 11:39 PM 04/07/2020 11:46 PM 0 Hours, 7 Minutes Bonneville Power Administration WECC Washington: Unexpected Transmission loss within its area, contrary to design, of three or more Bulk Electric System Facilities caused by a common disturbance (excluding successful automatic reclosing).-Transmission Interruption 0 0
2020 4 04/08/2020 1:21 AM 04/08/2020 3:56 AM 2 Hours, 35 Minutes Ohio Edison Co WECC Ohio: Loss of electric service to more than 50,000 customers for 1 hour or more.-Severe Weather Unknown 82509
2020 4 04/08/2020 9:57 PM 04/09/2020 8:59 AM 11 Hours, 2 Minutes Duke Energy Midwest RF Ohio: Kentucky: Loss of electric service to more than 50,000 customers for 1 hour or more.-Severe Weather Unknown 78314
2020 4 04/08/2020 10:03 PM 04/09/2020 7:36 AM 9 Hours, 33 Minutes Duke Energy Midwest RF Indiana: Loss of electric service to more than 50,000 customers for 1 hour or more.-Severe Weather Unknown 93000
2020 4 04/09/2020 7:25 PM 04/10/2020 3:30 AM 8 Hours, 5 Minutes CenterPoint Energy TRE Texas: Harris County; Loss of electric service to more than 50,000 customers for 1 hour or more.-Severe Weather Unknown 95000
2020 4 04/09/2020 7:40 PM 04/11/2020 10:00 PM 50 Hours, 20 Minutes ISO New England NPCC Maine: Loss of electric service to more than 50,000 customers for 1 hour or more.-Severe Weather Unknown 340000
2020 4 04/11/2020 11:24 AM 04/11/2020 11:42 AM 0 Hours, 18 Minutes Pacificorp WECC Wyoming: Unexpected Transmission loss within its area, contrary to design, of three or more Bulk Electric System Facilities caused by a common disturbance (excluding successful automatic reclosing).-Transmission Interruption 0 0
2020 4 04/12/2020 5:00 PM 04/14/2020 1:25 AM 32 Hours, 25 Minutes Southern Company SERC Mississippi: Alabama: Georgia: Loss of electric service to more than 50,000 customers for 1 hour or more.-Severe Weather 448 62828
2020 4 04/12/2020 6:13 PM 04/13/2020 3:23 PM 21 Hours, 10 Minutes American Electric Power - (SPP Reliability Region) TRE Texas: Loss of electric service to more than 50,000 customers for 1 hour or more.-Severe Weather Unknown 63289
2020 4 04/12/2020 8:30 PM 04/14/2020 9:00 AM 36 Hours, 30 Minutes Arkansas Electric Coop Corp SPP RE Arkansas: Loss of electric service to more than 50,000 customers for 1 hour or more.-Severe Weather Unknown 51000
2020 4 04/12/2020 8:45 PM . . . Hours, . Minutes Entergy Corp SPP RE Arkansas: Loss of electric service to more than 50,000 customers for 1 hour or more.-Severe Weather Unknown 95318
2020 4 04/12/2020 9:28 PM 04/15/2020 12:00 PM 62 Hours, 32 Minutes American Electric Power - (RFC Reliability Region) RF Virginia: West Virginia: Loss of electric service to more than 50,000 customers for 1 hour or more.-Severe Weather Unknown 104000
2020 4 04/13/2020 12:45 AM 04/13/2020 3:00 AM 2 Hours, 15 Minutes Tennessee Valley Authority SERC Tennessee: Hamilton County; Loss of electric service to more than 50,000 customers for 1 hour or more.-Severe Weather Unknown 120000
2020 4 04/13/2020 3:30 AM 04/14/2020 6:18 PM 38 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 Unknown 216400
2020 4 04/13/2020 7:31 AM 04/13/2020 2:00 PM 6 Hours, 29 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 Unknown Unknown
2020 4 04/13/2020 8:08 AM . . . Hours, . Minutes Dominion Energy South Carolina SERC South Carolina: Loss of electric service to more than 50,000 customers for 1 hour or more.-Severe Weather Unknown 72233
2020 4 04/13/2020 10:25 AM 04/13/2020 6:55 PM 8 Hours, 30 Minutes Dominion Energy VA SERC North Carolina: Loss of electric service to more than 50,000 customers for 1 hour or more.-Severe Weather Unknown 95000
2020 4 04/13/2020 1:05 PM 04/14/2020 4:00 PM 26 Hours, 55 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 68476
2020 4 04/20/2020 12:59 AM 04/20/2020 8:40 AM 7 Hours, 41 Minutes Southern Company SERC Alabama: Mississippi: Georgia: Florida: Loss of electric service to more than 50,000 customers for 1 hour or more.-Severe Weather 552 77341
2020 4 04/23/2020 4:30 AM 04/23/2020 7:00 AM 2 Hours, 30 Minutes Entergy Corp SERC Mississippi: Arkansas: Louisiana: Loss of electric service to more than 50,000 customers for 1 hour or more.-Severe Weather Unknown 55184
2020 4 04/23/2020 8:00 AM 04/23/2020 11:40 PM 15 Hours, 40 Minutes Southern Company SERC Alabama: Georgia: Mississippi: Florida: Loss of electric service to more than 50,000 customers for 1 hour or more.-Severe Weather 375 52163
2020 4 04/24/2020 9:00 PM 04/24/2020 9:33 PM 0 Hours, 33 Minutes Pacific Gas & Electric Co WECC California: Placer County, Nevada County; Electrical System Separation (Islanding) where part or parts of power grid remain(s) operational in an otherwise blacked out area or within the partial failure of an integrated electrical system.-System Operations 5 945
2020 4 04/26/2020 1:38 AM . . . Hours, . Minutes Florida Power & Light FRCC Florida: Loss of electric service to more than 50,000 customers for 1 hour or more.-Severe Weather Unknown 49999
2020 4 04/28/2020 8:01 PM 04/28/2020 11:21 PM 3 Hours, 20 Minutes Entergy - Transmission Operations Engineering TRE Texas: Jefferson County; Unexpected Transmission loss within its area, contrary to design, of three or more Bulk Electric System Facilities caused by a common disturbance (excluding successful automatic reclosing).-Transmission Interruption 14 1
2020 4 04/29/2020 5:55 AM 04/29/2020 7:00 PM 13 Hours, 5 Minutes CenterPoint Energy Houston Electric, LLC TRE Texas: Harris County; Loss of electric service to more than 50,000 customers for 1 hour or more.-Severe Weather Unknown 146660
2020 4 04/29/2020 6:00 AM 04/29/2020 12:31 PM 6 Hours, 31 Minutes Entergy Corp SERC Louisiana: Loss of electric service to more than 50,000 customers for 1 hour or more.-Severe Weather Unknown 77933
2020 4 04/30/2020 3:00 PM . . . Hours, . Minutes Exelon Corporation/PECO RF Pennsylvania: Bucks County, Chester County, Delaware County, Montgomery County, Philadelphia County, York County; Loss of electric service to more than 50,000 customers for 1 hour or more.-Severe Weather Unknown 78007
2020 5 05/04/2020 11:59 AM 05/07/2020 8:00 PM 80 Hours, 1 Minutes Tennessee Valley Authority SERC Tennessee: Davidson County; Loss of electric service to more than 50,000 customers for 1 hour or more.-Severe Weather 500 130000
2020 5 05/13/2020 5:12 AM 05/13/2020 2:07 PM 8 Hours, 55 Minutes Bonneville Power Administration WECC Washington: Unexpected Transmission loss within its area, contrary to design, of three or more Bulk Electric System Facilities caused by a common disturbance (excluding successful automatic reclosing).-Transmission Interruption 0 0
2020 5 05/15/2020 5:55 PM 05/17/2020 6:00 PM 48 Hours, 5 Minutes Niagara Mohawk Power Corporation (dba National Grid) NPCC New York: Saratoga County; Loss of electric service to more than 50,000 customers for 1 hour or more.-Severe Weather Unknown 52
2020 5 05/22/2020 4:35 PM 05/23/2020 3:29 PM 22 Hours, 54 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 Unknown 108190
2020 5 05/24/2020 4:45 PM . . . Hours, . Minutes Oklahoma Gas & Electric Co SPP RE Central Oklahoma Loss of electric service to more than 50,000 customers for 1 hour or more.-Severe Weather Unknown 54000
2020 5 05/25/2020 10:58 AM 05/25/2020 1:00 PM 2 Hours, 2 Minutes LCRA Transmission Services Corporation TRE Texas: Kerr County; Unexpected Transmission loss within its area, contrary to design, of three or more Bulk Electric System Facilities caused by a common disturbance (excluding successful automatic reclosing).-Transmission Interruption 8 3745
2020 5 05/27/2020 5:15 PM 05/29/2020 6:30 AM 37 Hours, 15 Minutes CenterPoint Energy Houston Electric, LLC TRE Texas: Harris County; Loss of electric service to more than 50,000 customers for 1 hour or more.-Severe Weather Unknown 382000
2020 5 05/27/2020 5:20 PM . . . Hours, . Minutes CenterPoint Energy TRE Texas: Loss of electric service to more than 50,000 customers for 1 hour or more.-Severe Weather Unknown 273269
2020 5 05/29/2020 5:01 PM 05/29/2020 6:57 PM 1 Hours, 56 Minutes FirstEnergy Corp RF Pennsylvania: Warren County; Unexpected Transmission loss within its area, contrary to design, of three or more Bulk Electric System Facilities caused by a common disturbance (excluding successful automatic reclosing).-Transmission Interruption 0 0
2020 6 06/03/2020 12:30 PM 06/03/2020 6:00 PM 5 Hours, 30 Minutes Exelon Corporation/PECO RF Pennsylvania: Bucks County, Chester County, Delaware County, Montgomery County, Philadelphia County, York County; Loss of electric service to more than 50,000 customers for 1 hour or more.-Severe Weather Unknown 708000
2020 6 06/03/2020 1:00 PM 06/06/2020 4:30 PM 75 Hours, 30 Minutes Public Service Electric & Gas RF New Jersey: Loss of electric service to more than 50,000 customers for 1 hour or more.-Severe Weather 80 87000
2020 6 06/03/2020 1:36 PM 06/03/2020 4:30 PM 2 Hours, 54 Minutes Jersey Central Power & Lt Co RF New Jersey: Loss of electric service to more than 50,000 customers for 1 hour or more.-Severe Weather Unknown 78079
2020 6 06/09/2020 11:21 AM 06/09/2020 12:01 PM 0 Hours, 40 Minutes Bonneville Power Administration WECC Washington: Unexpected Transmission loss within its area, contrary to design, of three or more Bulk Electric System Facilities caused by a common disturbance (excluding successful automatic reclosing).-Transmission Interruption 0 0
2020 6 06/10/2020 12:22 PM 06/10/2020 5:00 PM 4 Hours, 38 Minutes Consumers Energy Co RF Michigan: Gratiot County, Lake County, Missaukee County, Benzie County, Leelanau County, Manistee County, Wexford County, Montcalm County, Kent County, Ottawa County, Van Buren County, St. Joseph County, Arenac County, Saginaw County, Calhoun County, Branch County; Loss of electric service to more than 50,000 customers for 1 hour or more.-Severe Weather Unknown 270000
2020 6 06/10/2020 5:24 PM 06/11/2020 6:00 PM 24 Hours, 36 Minutes American Electric Power - (RFC Reliability Region) RF Ohio: Indiana: Kentucky: West Virginia: Loss of electric service to more than 50,000 customers for 1 hour or more.-Severe Weather Unknown 85822
2020 6 06/10/2020 7:30 PM . . . Hours, . Minutes Detroit Edison Co RF Michigan: Oakland County, Macomb County, Wayne County, Sanilac County, Tuscola County, Huron County, Lapeer County, Livingston County, Monroe County; Loss of electric service to more than 50,000 customers for 1 hour or more.-Severe Weather Unknown 237000
2020 6 06/27/2020 4:00 PM 06/28/2020 2:27 AM 10 Hours, 27 Minutes Southern Company SERC Alabama: Georgia: Loss of electric service to more than 50,000 customers for 1 hour or more.-Severe Weather 33480 78109
2020 6 06/29/2020 2:32 PM 06/29/2020 4:35 PM 2 Hours, 3 Minutes Entergy - Transmission Operations Engineering SPP RE Arkansas: Garland County; Unexpected Transmission loss within its area, contrary to design, of three or more Bulk Electric System Facilities caused by a common disturbance (excluding successful automatic reclosing).-Transmission Interruption 0 0
2020 7 07/01/2020 7:26 PM 07/01/2020 7:44 PM 0 Hours, 18 Minutes FirstEnergy Corp RF Pennsylvania: Unexpected Transmission loss within its area, contrary to design, of three or more Bulk Electric System Facilities caused by a common disturbance (excluding successful automatic reclosing).-Transmission Interruption 32 2013
2020 7 07/02/2020 8:30 PM . . . Hours, . Minutes California Department of Water Resources WECC California: Butte County; Fuel supply emergencies that could impact electric power system adequacy or reliability.-Fuel Supply Deficiency 0 0
2020 7 07/07/2020 11:38 AM 07/07/2020 6:24 PM 6 Hours, 46 Minutes Los Angeles Department of Water & Power WECC California: Los Angeles County; Unexpected Transmission loss within its area, contrary to design, of three or more Bulk Electric System Facilities caused by a common disturbance (excluding successful automatic reclosing).-Transmission Interruption 0 0
2020 7 07/07/2020 1:09 PM 07/08/2020 8:17 AM 19 Hours, 8 Minutes Public Service Company of Colorado WECC Colorado: Unexpected Transmission loss within its area, contrary to design, of three or more Bulk Electric System Facilities caused by a common disturbance (excluding successful automatic reclosing).-Transmission Interruption 0 0
2020 7 07/07/2020 7:17 PM 07/07/2020 11:49 PM 4 Hours, 32 Minutes American Electric Power - (RFC Reliability Region) RF West Virginia: Wyoming County; Unexpected Transmission loss within its area, contrary to design, of three or more Bulk Electric System Facilities caused by a common disturbance (excluding successful automatic reclosing).-Severe Weather/Transmission Interruption Unknown Unknown
2020 7 07/08/2020 6:45 PM . . . Hours, . Minutes California Department of Water Resources WECC California: Fuel supply emergencies that could impact electric power system adequacy or reliability.-Fuel Supply Deficiency 0 0
2020 7 07/11/2020 4:55 AM . . . Hours, . Minutes California Department of Water Resources WECC California: Fuel supply emergencies that could impact electric power system adequacy or reliability.-Fuel Supply Deficiency 0 0
2020 7 07/11/2020 9:30 PM . . . Hours, . Minutes Southwest Power Pool, Inc. SPP RE Oklahoma: Loss of electric service to more than 50,000 customers for 1 hour or more.-Severe Weather Unknown 94700
2020 7 07/11/2020 11:30 PM 07/12/2020 6:30 AM 7 Hours, 0 Minutes Oklahoma Gas & Electric Co SPP RE Oklahoma: Arkansas: Loss of electric service to more than 50,000 customers for 1 hour or more.-Severe Weather Unknown 68000
2020 7 07/12/2020 4:30 AM 07/13/2020 5:00 AM 24 Hours, 30 Minutes Oncor Electric Delivery Company LLC TRE Texas: Collin County, Dallas County, Denton County, Rockwall County, Tarrant County; Loss of electric service to more than 50,000 customers for 1 hour or more.-Severe Weather Unknown 48000
2020 7 07/19/2020 10:30 AM . . . Hours, . Minutes Somerset Operating Company NPCC New York: Niagara County Fuel supply emergencies that could impact electric power system adequacy or reliability.-Fuel Supply Deficiency 675  
2020 7 07/19/2020 2:30 PM 07/21/2020 6:48 PM 52 Hours, 18 Minutes Detroit Edison Co RF Michigan: Loss of electric service to more than 50,000 customers for 1 hour or more.-Severe Weather Unknown 158500
2020 7 07/22/2020 11:30 AM 07/22/2020 2:19 PM 2 Hours, 49 Minutes FirstEnergy Corp RF West Virginia: Tucker County; Unexpected Transmission loss within its area, contrary to design, of three or more Bulk Electric System Facilities caused by a common disturbance (excluding successful automatic reclosing).-Transmission Interruption 0 0
2020 7 07/25/2020 7:58 PM 07/27/2020 7:00 PM 47 Hours, 2 Minutes American Electric Power - Texas TRE Texas: Nueces County, Kleberg County, Cameron County, Willacy County, Hidalgo County, Starr County, Kenedy County; Loss of electric service to more than 50,000 customers for 1 hour or more.-Severe Weather Unknown 201208
2020 7 07/25/2020 9:00 PM 07/26/2020 4:00 PM 19 Hours, 0 Minutes Magic Valley Electric Cooperative, Inc. TRE Texas: Hidalgo County, Cameron County, Starr County, Kenedy County, Willacy County, Brooks County, Jim Hogg County; Loss of electric service to more than 50,000 customers for 1 hour or more.-Severe Weather 125 84000
2020 7 07/30/2020 5:54 PM 07/30/2020 8:18 PM 2 Hours, 24 Minutes Western Area Power Administration - Upper Great Plains Region MRO Nebraska: Scotts Bluff County; Unexpected Transmission loss within its area, contrary to design, of three or more Bulk Electric System Facilities caused by a common disturbance (excluding successful automatic reclosing).-Transmission Interruption 0 0
2020 8 08/01/2020 11:14 AM 08/10/2020 9:26 PM 226 Hours, 12 Minutes American Electric Power - Texas TRE Texas: Cameron County, Willacy County, Hidalgo County, Starr County; Public appeal to reduce the use of electricity for purposes of maintaining the continuity of the Bulk Electric System.-Severe Weather Unknown Unknown
2020 8 08/02/2020 7:43 PM 08/02/2020 10:27 PM 2 Hours, 44 Minutes MidAmerican Energy Co SERC Illinois: Rock Island County; Unexpected Transmission loss within its area, contrary to design, of three or more Bulk Electric System Facilities caused by a common disturbance (excluding successful automatic reclosing).-Transmission Interruption 0 0
2020 8 08/03/2020 11:15 PM 08/06/2020 7:00 AM 55 Hours, 45 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 Unknown 340000
2020 8 08/04/2020 4:41 AM 08/05/2020 4:26 PM 35 Hours, 45 Minutes Dominion Energy VA SERC Virginia: Loss of electric service to more than 50,000 customers for 1 hour or more.-Severe Weather Unknown 508000
2020 8 08/04/2020 6:01 AM 08/06/2020 3:30 PM 57 Hours, 29 Minutes North Carolina El Member Corp SERC North Carolina: Brunswick County, Columbus County, Pender County, Duplin County, Onslow County, Jones County, Craven County, Jones County, Beaufort County, Bertie County, Chowan County, Gates County, Perquimans County; Loss of electric service to more than 50,000 customers for 1 hour or more.-Severe Weather 311 125987
2020 8 08/04/2020 9:00 AM 08/05/2020 6:00 PM 33 Hours, 0 Minutes Delmarva Power & Light Company RF Delaware: Loss of electric service to more than 50,000 customers for 1 hour or more.-Severe Weather Unknown 100000
2020 8 08/04/2020 10:30 AM . . . Hours, . Minutes Atlantic City Electric Co RF New Jersey: Loss of electric service to more than 50,000 customers for 1 hour or more.-Severe Weather Unknown 70000
2020 8 08/04/2020 11:20 AM 08/07/2020 10:55 AM 71 Hours, 35 Minutes Public Service Electric & Gas RF New Jersey: Loss of electric service to more than 50,000 customers for 1 hour or more.-Severe Weather 60 75000
2020 8 08/04/2020 12:00 PM . . . Hours, . Minutes Exelon Corporation/PECO RF Pennsylvania: Bucks County, Chester County, Delaware County, Montgomery County, Philadelphia County, York County; Loss of electric service to more than 50,000 customers for 1 hour or more.-Severe Weather Unknown 137103
2020 8 08/04/2020 12:00 PM 08/07/2020 6:00 AM 66 Hours, 0 Minutes Orange and Rockland Utilities, Inc. NPCC New York: Rockland County, Orange County, Sullivan County; New Jersey: Bergen County, Passaic County, Sussex County; Loss of electric service to more than 50,000 customers for 1 hour or more.-Severe Weather Unknown 160000
2020 8 08/04/2020 12:18 PM 08/08/2020 5:31 PM 101 Hours, 13 Minutes Jersey Central Power & Lt Co RF New Jersey: Loss of electric service to more than 50,000 customers for 1 hour or more.-Severe Weather Unknown 788000
2020 8 08/04/2020 1:00 PM 08/04/2020 11:59 PM 10 Hours, 59 Minutes Long Island Power Authority NPCC New York: Nassau County, Suffolk County, Queens County; Loss of electric service to more than 50,000 customers for 1 hour or more.-Severe Weather 3907 420000
2020 8 08/04/2020 1:31 PM . . . Hours, . Minutes Consolidated Edison of New York, Inc. NPCC New York: Bronx County, Richmond County, Queens County, Kings County, Westchester County, New York County; Loss of electric service to more than 50,000 customers for 1 hour or more.-Severe Weather Unknown 271119
2020 8 08/04/2020 2:00 PM 08/08/2020 12:00 PM 94 Hours, 0 Minutes Central Hudson Gas & Elec Corp NPCC New York: Dutchess County, Orange County, Ulster County; Loss of electric service to more than 50,000 customers for 1 hour or more.-Severe Weather Unknown 116818
2020 8 08/04/2020 2:35 PM . . . Hours, . Minutes Avangrid/NYSEG NPCC New York: Loss of electric service to more than 50,000 customers for 1 hour or more.-Severe Weather Unknown 76120
2020 8 08/04/2020 2:35 PM 08/10/2020 11:00 AM 140 Hours, 25 Minutes New York State Electric & Gas NPCC New York: Broome County; Loss of electric service to more than 50,000 customers for 1 hour or more.-Severe Weather Unknown 76120
2020 8 08/04/2020 3:15 PM 08/07/2020 10:27 AM 67 Hours, 12 Minutes ISO New England NPCC Connecticut: Massachusetts: New Hampshire: Maine: Rhode Island: Vermont: Loss of electric service to more than 50,000 customers for 1 hour or more.-Severe Weather 2000 1188247
2020 8 08/05/2020 5:58 PM 08/05/2020 8:53 PM 2 Hours, 55 Minutes Entergy - Transmission Operations Engineering TRE Texas: Orange County; Unexpected Transmission loss within its area, contrary to design, of three or more Bulk Electric System Facilities caused by a common disturbance (excluding successful automatic reclosing).-Transmission Interruption 89 19785
2020 8 08/07/2020 5:13 AM . . . Hours, . Minutes Consolidated Edison of New York, Inc. NPCC New York: Queens County, New York County; Uncontrolled loss of 300 Megawatts or more of firm system loads for 15 minutes or more from a single incident.-Severe Weather 500 187068
2020 8 08/10/2020 10:00 AM . . . Hours, . Minutes MidAmerican Energy Co MRO Iowa: Dallas County, Polk County, Warren County, Madison County, Johnson County, Scott County; Illinois: Rock Island County, Henry County, Mercer County; Loss of electric service to more than 50,000 customers for 1 hour or more.-Severe Weather 950 300000
2020 8 08/10/2020 11:00 AM 08/10/2020 4:00 PM 5 Hours, 0 Minutes Central Iowa Power Cooperative MRO Iowa: Webster County, Greene County, Dallas County, Hamilton County, Boone County, Polk County, Hardin County, Story County, Jasper County, Grundy County, Marshall County, Tama County, Poweshiek County, Benton County, Iowa County, Linn County, Johnson County, Jones County, Cedar County, Muscatine County, Jackson County, Clinton County, Scott County; Uncontrolled loss of 200 Megawatts or more of firm system loads for 15 minutes or more from a single incident for entities with previous year's peak demand less than or equal to 3,000 Megawatts.-Severe Weather 550 Unknown
2020 8 08/10/2020 12:38 PM . . . Hours, . Minutes Alliant Energy MRO Iowa: Uncontrolled loss of 300 Megawatts or more of firm system loads for 15 minutes or more from a single incident.-Severe Weather 1400 250000
2020 8 08/10/2020 2:30 PM . . . Hours, . Minutes ComEd SERC Illinois: Cook County, Will County, DuPage County, Lake County, Kane County, Grundy County, LaSalle County, DeKalb County, McHenry County, Lee County; Loss of electric service to more than 50,000 customers for 1 hour or more.-Severe Weather Unknown 856000
2020 8 08/10/2020 4:00 PM 08/13/2020 3:00 PM 71 Hours, 0 Minutes Ameren Illinois Company SERC Illinois: Missouri: Loss of electric service to more than 50,000 customers for 1 hour or more.-Severe Weather Unknown 135000
2020 8 08/10/2020 10:39 PM 08/13/2020 3:48 PM 65 Hours, 9 Minutes Northern Indiana Pub Serv Co RF Indiana: Loss of electric service to more than 50,000 customers for 1 hour or more.-Severe Weather Unknown 95300
2020 8 08/13/2020 1:51 PM 08/13/2020 4:27 PM 2 Hours, 36 Minutes El Paso Electric TRE Texas: El Paso County; Firm load shedding of 100 Megawatts or more implemented under emergency operational policy.-System Operations 218 57060
2020 8 08/14/2020 4:39 PM 08/14/2020 5:42 PM 1 Hours, 3 Minutes Entergy - Transmission Operations Engineering SERC Louisiana: St. Charles Parish; Unexpected Transmission loss within its area, contrary to design, of three or more Bulk Electric System Facilities caused by a common disturbance (excluding successful automatic reclosing).-Transmission Interruption 101 12671
2020 8 08/14/2020 5:15 PM 08/15/2020 9:00 PM 27 Hours, 45 Minutes California ISO WECC California: Firm load shedding of 100 Megawatts or more implemented under emergency operational policy.-Severe Weather 1120 Unknown
2020 8 08/14/2020 6:36 PM 08/14/2020 8:42 PM 2 Hours, 6 Minutes Pacific Gas & Electric Co WECC California: Firm load shedding of 100 Megawatts or more implemented under emergency operational policy.-System Operations 560 220000
2020 8 08/14/2020 6:45 PM 08/14/2020 9:12 PM 2 Hours, 27 Minutes Southern California Edison Co WECC California: Kern County, Kings County, Los Angeles County, Orange County, Riverside County, San Bernardino County, Santa Barbara County, Tulare County, Ventura County; Firm load shedding of 100 Megawatts or more implemented under emergency operational policy.-System Operations 1419 132000
2020 8 08/14/2020 8:00 PM 08/16/2020 5:00 PM 45 Hours, 0 Minutes Northern States Power Co MRO Minnesota: Anoka County, Hennepin County, Ramsey County, Washington County; Loss of electric service to more than 50,000 customers for 1 hour or more.-Severe Weather Unknown 60000
2020 8 08/15/2020 2:53 PM 08/15/2020 8:00 PM 5 Hours, 7 Minutes California ISO WECC California: Firm load shedding of 100 Megawatts or more implemented under emergency operational policy.-Severe Weather 795 Unknown
2020 8 08/15/2020 3:00 PM 08/15/2020 7:45 PM 4 Hours, 45 Minutes Southern California Edison Co WECC California: Inyo County, Kern County, Los Angeles County, Orange County, Riverside County, San Bernardino County, Tulare County, Ventura County; Firm load shedding of 100 Megawatts or more implemented under emergency operational policy.-System Operations 200 70000
2020 8 08/15/2020 6:25 PM 08/15/2020 7:44 PM 1 Hours, 19 Minutes Pacific Gas & Electric Co WECC California: Firm load shedding of 100 Megawatts or more implemented under emergency operational policy.-System Operations 459 220000
2020 8 08/16/2020 3:44 AM 08/17/2020 2:18 PM 34 Hours, 34 Minutes Pacific Gas & Electric Co WECC California: Loss of electric service to more than 50,000 customers for 1 hour or more.-Severe Weather 409 124266
2020 8 08/16/2020 5:30 PM 08/16/2020 7:10 PM 1 Hours, 40 Minutes California ISO WECC California: Public appeal to reduce the use of electricity for purposes of maintaining the continuity of the Bulk Electric System.-Severe Weather 712 Unknown
2020 8 08/16/2020 8:00 PM 08/18/2020 9:00 PM 49 Hours, 0 Minutes Oncor Electric Delivery Company LLC TRE Texas: Collin County, Dallas County, Denton County, Tarrant County, Ellis County, Kaufman County, Johnson County, Anderson County, Angelina County, Grayson County, Smith County, Wichita County; Loss of electric service to more than 50,000 customers for 1 hour or more.-Severe Weather Unknown 300000
2020 8 08/17/2020 8:21 AM 08/17/2020 9:01 AM 0 Hours, 40 Minutes Pacific Gas & Electric Co WECC California: Yuba County; Electrical System Separation (Islanding) where part or parts of power grid remain(s) operational in an otherwise blacked out area or within the partial failure of an integrated electrical system.-Severe Weather 2 2
2020 8 08/17/2020 3:05 PM 08/17/2020 9:24 PM 6 Hours, 19 Minutes California ISO WECC California: Public appeal to reduce the use of electricity for purposes of maintaining the continuity of the Bulk Electric System.-Severe Weather 829 Unknown
2020 8 08/18/2020 1:30 PM 08/18/2020 8:30 PM 7 Hours, 0 Minutes California ISO WECC California: Public appeal to reduce the use of electricity for purposes of maintaining the continuity of the Bulk Electric System.-Severe Weather 917 Unknown
2020 8 08/18/2020 2:00 PM 08/18/2020 9:00 PM 7 Hours, 0 Minutes NV Energy WECC Nevada: Public appeal to reduce the use of electricity for purposes of maintaining the continuity of the Bulk Electric System.-Severe Weather 7800 1400000
2020 8 08/18/2020 2:30 PM . . . Hours, . Minutes Arizona Public Service Co WECC Arizona: Public appeal to reduce the use of electricity for purposes of maintaining the continuity of the Bulk Electric System.-Severe Weather 0 Unknown
2020 8 08/18/2020 2:44 PM 08/18/2020 3:14 PM 0 Hours, 30 Minutes Oncor Electric Delivery Company LLC TRE Texas: Culberson County, Reeves County; Unexpected Transmission loss within its area, contrary to design, of three or more Bulk Electric System Facilities caused by a common disturbance (excluding successful automatic reclosing).-Transmission Interruption 205 238
2020 8 08/19/2020 1:27 AM 08/19/2020 3:03 AM 1 Hours, 36 Minutes FirstEnergy Corp RF Ohio: Trumbull County; Unexpected Transmission loss within its area, contrary to design, of three or more Bulk Electric System Facilities caused by a common disturbance (excluding successful automatic reclosing).-Transmission Interruption 22 16107
2020 8 08/19/2020 12:00 PM 08/19/2020 9:00 PM 9 Hours, 0 Minutes City of Redding WECC California: Public appeal to reduce the use of electricity for purposes of maintaining the continuity of the Bulk Electric System.-Severe Weather Unknown Unknown
2020 8 08/19/2020 2:00 PM 08/19/2020 9:00 PM 7 Hours, 0 Minutes NV Energy WECC Nevada: Public appeal to reduce the use of electricity for purposes of maintaining the continuity of the Bulk Electric System.-Severe Weather 7500 1400000
2020 8 08/19/2020 2:00 PM 08/19/2020 9:00 PM 7 Hours, 0 Minutes Salt River Project WECC Arizona: Maricopa County; Public appeal to reduce the use of electricity for purposes of maintaining the continuity of the Bulk Electric System.-Severe Weather 1200 0
2020 8 08/20/2020 3:29 PM 08/20/2020 3:39 PM 0 Hours, 10 Minutes Nebraska Public Power District MRO Nebraska: Custer County; Unexpected Transmission loss within its area, contrary to design, of three or more Bulk Electric System Facilities caused by a common disturbance (excluding successful automatic reclosing).-Transmission Interruption 60 Unknown
2020 8 08/23/2020 10:30 AM . . . Hours, . Minutes Southwestern Public Service TRE Texas panhandle, SE NM Public appeal to reduce the use of electricity for purposes of maintaining the continuity of the Bulk Electric System.-Severe Weather Unknown Unknown
2020 8 08/27/2020 1:15 AM . . . Hours, . Minutes Entergy Corp TRE Texas: Louisiana: Loss of electric service to more than 50,000 customers for 1 hour or more.-Severe Weather Unknown 615992
2020 8 08/27/2020 3:14 AM . . . Hours, . Minutes Cleco Power LLC SERC Louisiana: Calcasieu Parish, Beauregard Parish, Iberia Parish, Acadia Parish, Evangeline Parish, Rapides Parish, St. Landry Parish, Vernon Parish; Loss of electric service to more than 50,000 customers for 1 hour or more.-Severe Weather Unknown Unknown
2020 8 08/27/2020 5:00 AM 09/03/2020 12:00 PM 175 Hours, 0 Minutes Louisiana Generating LLC SERC Louisiana: Loss of electric service to more than 50,000 customers for 1 hour or more.-Severe Weather 200 50000
2020 8 08/27/2020 7:00 AM 08/30/2020 7:00 PM 84 Hours, 0 Minutes City of Alexandria SERC Louisiana: Rapides Parish; Complete operational failure or shut-down of the transmission and/or distribution of electrical system.-Severe Weather 48 Unknown
2020 8 08/27/2020 7:40 AM 08/31/2020 3:33 AM 91 Hours, 53 Minutes American Electric Power - (SPP Reliability Region) SERC Louisiana: Texas: Loss of electric service to more than 50,000 customers for 1 hour or more.-Severe Weather Unknown 47927
2020 8 08/27/2020 7:40 AM 08/31/2020 7:40 AM 96 Hours, 0 Minutes Southwest Power Pool, Inc. SERC Louisiana: Texas: Loss of electric service to more than 50,000 customers for 1 hour or more.-Severe Weather Unknown 130000
2020 8 08/27/2020 12:02 PM 08/27/2020 10:54 PM 10 Hours, 52 Minutes MISO TRE Texas: Firm load shedding of 100 Megawatts or more implemented under emergency operational policy.-Severe Weather 573 Unknown
2020 8 08/27/2020 12:06 PM . . . Hours, . Minutes Entergy Transmission Control Center - North TRE Texas: Firm load shedding of 100 Megawatts or more implemented under emergency operational policy.-Severe Weather 350 Unknown
2020 8 08/27/2020 12:06 PM 08/27/2020 10:49 PM 10 Hours, 43 Minutes Entergy - Transmission Operations Engineering TRE Texas: Firm load shedding of 100 Megawatts or more implemented under emergency operational policy.-Severe Weather 581 Unknown
2020 8 08/27/2020 12:44 PM 08/27/2020 11:00 PM 10 Hours, 16 Minutes Entergy Services, Inc. TRE Texas: Public appeal to reduce the use of electricity for purposes of maintaining the continuity of the Bulk Electric System.-Severe Weather Unknown Unknown
2020 8 08/27/2020 1:24 PM . . . Hours, . Minutes Entergy Transmission Control Center - South TRE Texas: Montgomery County, Liberty County; Firm load shedding of 100 Megawatts or more implemented under emergency operational policy.-Severe Weather 208 Unknown
2020 8 08/27/2020 5:11 PM 08/28/2020 10:00 AM 16 Hours, 49 Minutes ISO New England NPCC Connecticut: Massachusetts: New Hampshire: Maine: Rhode Island: Vermont: Loss of electric service to more than 50,000 customers for 1 hour or more.-Severe Weather 100 60687
2020 8 08/28/2020 4:27 PM 08/28/2020 7:26 PM 2 Hours, 59 Minutes Bonneville Power Administration WECC Washington: Oregon: Total generation loss, within one minute of: greater than or equal to 2,000 Megawatts in the Eastern or Western Interconnection or greater than or equal to 1,400 Megawatts in the ERCOT Interconnection.-Severe Weather 0 0
2020 9 09/03/2020 1:46 PM 09/03/2020 10:47 PM 9 Hours, 1 Minutes Snohomish County PUD No 1 WECC Washington: Unexpected Transmission loss within its area, contrary to design, of three or more Bulk Electric System Facilities caused by a common disturbance (excluding successful automatic reclosing).-Transmission Interruption Unknown Unknown
2020 9 09/05/2020 5:20 PM 09/05/2020 8:37 PM 3 Hours, 17 Minutes California ISO WECC California: Public appeal to reduce the use of electricity for purposes of maintaining the continuity of the Bulk Electric System.-Severe Weather 986 Unknown
2020 9 09/05/2020 5:25 PM 09/05/2020 8:55 PM 3 Hours, 30 Minutes Imperial Irrigation District WECC California: Imperial County; Firm load shedding of 100 Megawatts or more implemented under emergency operational policy.-Severe Weather 100 20000
2020 9 09/06/2020 4:00 PM 09/06/2020 9:00 PM 5 Hours, 0 Minutes NV Energy WECC Nevada: Public appeal to reduce the use of electricity for purposes of maintaining the continuity of the Bulk Electric System.-Severe Weather 8180 1400000
2020 9 09/06/2020 4:30 PM 09/06/2020 9:05 PM 4 Hours, 35 Minutes California ISO WECC California: Public appeal to reduce the use of electricity for purposes of maintaining the continuity of the Bulk Electric System.-System Operations 1071 Unknown
2020 9 09/06/2020 5:00 PM 09/07/2020 3:00 AM 10 Hours, 0 Minutes Los Angeles Department of Water & Power WECC California: Los Angeles County; Loss of electric service to more than 50,000 customers for 1 hour or more.-Severe Weather Unknown 72000
2020 9 09/06/2020 5:36 PM 09/06/2020 7:27 PM 1 Hours, 51 Minutes Bonneville Power Administration WECC Washington: Oregon: California: Total generation loss, within one minute of: greater than or equal to 2,000 Megawatts in the Eastern or Western Interconnection or greater than or equal to 1,400 Megawatts in the ERCOT Interconnection.-System Operations 0 0
2020 9 09/07/2020 9:13 AM 09/08/2020 6:00 AM 20 Hours, 47 Minutes Public Utility District No 1 of Okanogan County WECC Washington: Complete operational failure or shut-down of the transmission and/or distribution of electrical system.-Natural Disaster 80 21000
2020 9 09/07/2020 6:00 PM 09/08/2020 6:00 PM 24 Hours, 0 Minutes Puget Sound Energy WECC Washington: Kitsap County, King County, Pierce County; Loss of electric service to more than 50,000 customers for 1 hour or more.-Severe Weather Unknown 71500
2020 9 09/07/2020 7:05 PM 09/08/2020 10:00 PM 26 Hours, 55 Minutes Portland General Electric Co WECC Oregon: Multnomah County, Washington County, Clackamas County, Marion County, Yamhill County, Polk County; Loss of electric service to more than 50,000 customers for 1 hour or more.-Severe Weather 2859 103000
2020 9 09/07/2020 10:40 PM 09/09/2020 5:24 PM 42 Hours, 44 Minutes Pacific Gas & Electric Co WECC California: Loss of electric service to more than 50,000 customers for 1 hour or more.-Transmission Interruption 610 172000
2020 9 09/09/2020 11:22 AM 09/09/2020 1:04 PM 1 Hours, 42 Minutes Idaho Power Company WECC Idaho: Unexpected Transmission loss within its area, contrary to design, of three or more Bulk Electric System Facilities caused by a common disturbance (excluding successful automatic reclosing).-Natural Disaster 0 0
2020 9 09/15/2020 10:00 PM 09/20/2020 3:00 PM 113 Hours, 0 Minutes Southern Company SERC Alabama: Florida: Georgia: Mississippi: Loss of electric service to more than 50,000 customers for 1 hour or more.-Severe Weather/Transmission Interruption 236 34096
2020 9 09/16/2020 3:00 AM 09/21/2020 8:00 AM 125 Hours, 0 Minutes PowerSouth Energy Cooperative SERC Alabama: Baldwin County; Loss of electric service to more than 50,000 customers for 1 hour or more.-Severe Weather 0 77600
2020 9 09/22/2020 10:02 AM 09/22/2020 12:58 PM 2 Hours, 56 Minutes Pacific Gas & Electric Co WECC California: Electrical System Separation (Islanding) where part or parts of power grid remain(s) operational in an otherwise blacked out area or within the partial failure of an integrated electrical system.-System Operations 8 4350
2020 9 09/27/2020 6:27 PM 09/28/2020 3:17 PM 20 Hours, 50 Minutes Pacific Gas & Electric Co WECC California: Loss of electric service to more than 50,000 customers for 1 hour or more.-Natural Disaster 337 102267
2020 9 09/30/2020 5:55 AM 09/30/2020 11:30 PM 17 Hours, 35 Minutes ISO New England NPCC Connecticut: Maine: Rhode Island: Massachusetts: New Hampshire: Vermont: Loss of electric service to more than 50,000 customers for 1 hour or more.-Severe Weather Unknown 155000
2020 10 10/07/2020 1:45 PM 10/07/2020 1:59 PM 0 Hours, 14 Minutes Entergy - Transmission Operations Engineering SERC Louisiana: Orleans Parish; Unexpected Transmission loss within its area, contrary to design, of three or more Bulk Electric System Facilities caused by a common disturbance (excluding successful automatic reclosing).-Transmission Interruption 183 39089
2020 10 10/07/2020 4:00 PM . . . Hours, . Minutes Niagara Mohawk Power Corporation (dba National Grid) NPCC New York: Onondaga County; Loss of electric service to more than 50,000 customers for 1 hour or more.-Severe Weather Unknown 7500
2020 10 10/07/2020 6:50 PM 10/09/2020 3:00 PM 44 Hours, 10 Minutes ISO New England NPCC Connecticut: Massachusetts: Maine: New Hampshire: Rhode Island: Vermont: Loss of electric service to more than 50,000 customers for 1 hour or more.-Severe Weather Unknown 186600
2020 10 10/09/2020 10:44 AM 10/09/2020 10:25 PM 11 Hours, 41 Minutes Public Service Company of Colorado WECC Colorado: Unexpected Transmission loss within its area, contrary to design, of three or more Bulk Electric System Facilities caused by a common disturbance (excluding successful automatic reclosing).-Transmission Interruption 0 0
2020 10 10/09/2020 5:30 PM 10/10/2020 6:00 PM 24 Hours, 30 Minutes Entergy Corp SERC Louisiana: Texas: Arkansas: Mississippi: Loss of electric service to more than 50,000 customers for 1 hour or more.-Severe Weather Unknown 477966
2020 10 10/09/2020 7:50 PM 10/11/2020 3:09 PM 43 Hours, 19 Minutes Cleco Power LLC SERC Louisiana: Acadia Parish, Beauregard Parish, Calcasieu Parish, Evangeline Parish, Iberia Parish, Rapides Parish, Vernon Parish, Avoyelles Parish, Grant Parish, Natchitoches Parish, St. Landry Parish, St. Mary Parish, St. Tammany Parish; Loss of electric service to more than 50,000 customers for 1 hour or more.-Severe Weather Unknown 132200
2020 10 10/09/2020 8:00 PM 10/10/2020 6:00 AM 10 Hours, 0 Minutes Lafayette Public Power Auth SERC Louisiana: Lafayette Parish; Loss of electric service to more than 50,000 customers for 1 hour or more.-Severe Weather Unknown 50000
2020 10 10/09/2020 8:00 PM 10/15/2020 7:00 AM 131 Hours, 0 Minutes Louisiana Generating LLC SERC Louisiana: Loss of electric service to more than 50,000 customers for 1 hour or more.-Severe Weather 200 50000
2020 10 10/10/2020 11:10 PM 10/10/2020 11:15 PM 0 Hours, 5 Minutes Bonneville Power Administration WECC Washington: Oregon: Unexpected Transmission loss within its area, contrary to design, of three or more Bulk Electric System Facilities caused by a common disturbance (excluding successful automatic reclosing).-Transmission Interruption 0 0
2020 10 10/12/2020 4:06 AM 10/12/2020 4:07 AM 0 Hours, 1 Minutes Duke Energy Florida FRCC Florida: Polk County; Unexpected Transmission loss within its area, contrary to design, of three or more Bulk Electric System Facilities caused by a common disturbance (excluding successful automatic reclosing).-Transmission Interruption 0 0
2020 10 10/13/2020 1:14 PM 10/14/2020 2:00 PM 24 Hours, 46 Minutes Puget Sound Energy WECC Washington: Whatcom County, King County, Pierce County, Thurston County, Kittitas County, Kitsap County; Loss of electric service to more than 50,000 customers for 1 hour or more.-Severe Weather Unknown 76000
2020 10 10/14/2020 6:26 PM 10/15/2020 1:11 PM 18 Hours, 45 Minutes American Electric Power - Texas TRE Texas: Pecos County; Unexpected Transmission loss within its area, contrary to design, of three or more Bulk Electric System Facilities caused by a common disturbance (excluding successful automatic reclosing).-Transmission Interruption 18 Unknown
2020 10 10/20/2020 6:48 PM 10/20/2020 6:49 PM 0 Hours, 1 Minutes GridLiance Holdco NCR11783 SERC Illinois: Massac County; Unexpected Transmission loss within its area, contrary to design, of three or more Bulk Electric System Facilities caused by a common disturbance (excluding successful automatic reclosing).-Transmission Interruption 0 0
2020 10 10/23/2020 3:42 PM 10/23/2020 11:11 PM 7 Hours, 29 Minutes Duke Energy Midwest RF Ohio: Unexpected Transmission loss within its area, contrary to design, of three or more Bulk Electric System Facilities caused by a common disturbance (excluding successful automatic reclosing).-Transmission Interruption Unknown Unknown
2020 10 10/23/2020 3:46 PM 10/23/2020 11:03 PM 7 Hours, 17 Minutes CenterPoint Energy TRE Texas: Harris County; Loss of electric service to more than 50,000 customers for 1 hour or more.-Severe Weather Unknown 55506
2020 10 10/24/2020 8:13 PM 10/24/2020 10:52 PM 2 Hours, 39 Minutes Northern States Power Co MRO Minnesota: Hennepin County; Unexpected Transmission loss within its area, contrary to design, of three or more Bulk Electric System Facilities caused by a common disturbance (excluding successful automatic reclosing).-Transmission Interruption 1 4
2020 10 10/25/2020 2:32 PM 10/27/2020 6:00 PM 51 Hours, 28 Minutes Pacific Gas & Electric Co WECC California: Loss of electric service to more than 50,000 customers for 1 hour or more.-Severe Weather 1218 370000
2020 10 10/26/2020 9:28 AM 10/26/2020 12:20 PM 2 Hours, 52 Minutes Public Service Company of Colorado WECC Colorado: Unexpected Transmission loss within its area, contrary to design, of three or more Bulk Electric System Facilities caused by a common disturbance (excluding successful automatic reclosing).-Transmission Interruption 75 13000
2020 10 10/26/2020 11:24 AM 10/27/2020 4:43 PM 29 Hours, 19 Minutes Southern California Edison Co WECC California: Los Angeles County, Riverside County, San Bernardino County, Orange County, Kern County, Ventura County; Loss of electric service to more than 50,000 customers for 1 hour or more.-Severe Weather Unknown 136833
2020 10 10/26/2020 1:00 PM 11/07/2020 7:00 PM 294 Hours, 0 Minutes Oklahoma Gas & Electric Co SPP RE Oklahoma: Oklahoma County, Canadian County, Logan County, Cleveland County, Pottawatomie County; Loss of electric service to more than 50,000 customers for 1 hour or more.-Severe Weather Unknown 447000
2020 10 10/27/2020 5:50 PM . . . Hours, . Minutes Southwest Power Pool, Inc. SPP RE Oklahoma: Loss of electric service to more than 50,000 customers for 1 hour or more.-Severe Weather Unknown 235000
2020 10 10/28/2020 10:28 AM 10/28/2020 10:29 AM 0 Hours, 1 Minutes ERCOT TRE Texas: Electrical System Separation (Islanding) where part or parts of power grid remain(s) operational in an otherwise blacked out area or within the partial failure of an integrated electrical system.-Severe Weather Unknown Unknown
2020 10 10/28/2020 11:53 AM 10/28/2020 3:26 PM 3 Hours, 33 Minutes Southwestern Public Service TRE Texas: Unexpected Transmission loss within its area, contrary to design, of three or more Bulk Electric System Facilities caused by a common disturbance (excluding successful automatic reclosing).-Transmission Interruption Unknown Unknown
2020 10 10/28/2020 5:12 PM 10/29/2020 4:30 PM 23 Hours, 18 Minutes Cleco Power LLC SERC Louisiana: St. Tammany Parish, St. Mary Parish; Loss of electric service to more than 50,000 customers for 1 hour or more.-Severe Weather Unknown 72707
2020 10 10/28/2020 6:00 PM 10/29/2020 1:15 AM 7 Hours, 15 Minutes Entergy Corp SERC Louisiana: Loss of electric service to more than 50,000 customers for 1 hour or more.-Severe Weather Unknown 481268
2020 10 10/28/2020 9:37 PM 11/02/2020 7:30 PM 117 Hours, 53 Minutes Southern Company SERC Alabama: Florida: Mississippi: Georgia: Loss of electric service to more than 50,000 customers for 1 hour or more.-Severe Weather 253 35478
2020 10 10/29/2020 2:00 AM 10/31/2020 9:00 AM 55 Hours, 0 Minutes PowerSouth Energy Cooperative SERC Alabama: Baldwin County, Butler County, Clarke County, Conecuh County, Escambia County, Lee County, Lowndes County, Macon County, Montgomery County, Pike County, Russell County, Tallapoosa County, Talladega County, Washington County, Monroe County; Florida: Escambia County, Okaloosa County, Walton County, Santa Rosa County; Loss of electric service to more than 50,000 customers for 1 hour or more.-Severe Weather 0 90000
2020 10 10/29/2020 8:15 AM 10/31/2020 6:45 PM 58 Hours, 30 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 Unknown 461580
2020 11 11/01/2020 6:00 PM 11/01/2020 6:09 PM 0 Hours, 9 Minutes Cleveland Electric Illum Co RF Ohio: Loss of electric service to more than 50,000 customers for 1 hour or more.-Severe Weather Unknown 85677
2020 11 11/07/2020 5:40 PM 11/07/2020 10:10 PM 4 Hours, 30 Minutes Public Service Company of Colorado WECC Colorado: Unexpected Transmission loss within its area, contrary to design, of three or more Bulk Electric System Facilities caused by a common disturbance (excluding successful automatic reclosing).-Transmission Interruption 0 0
2020 11 11/14/2020 7:40 AM . . . Hours, . Minutes California Department of Water Resources WECC California: San Bernardino County; Fuel supply emergencies that could impact electric power system adequacy or reliability.-Fuel Supply Deficiency 0 0
2020 11 11/15/2020 11:30 AM 11/16/2020 3:25 AM 15 Hours, 55 Minutes American Electric Power - (RFC Reliability Region) RF Ohio: West Virginia: Virginia: Indiana: Loss of electric service to more than 50,000 customers for 1 hour or more.-Severe Weather Unknown 75000
2020 11 11/15/2020 12:30 PM 11/18/2020 9:44 AM 69 Hours, 14 Minutes Detroit Edison Co RF Michigan: Huron County, Livingston County, Macomb County, Monroe County, Wayne County, Washtenaw County, Tuscola County, St. Clair County, Lapeer County, Oakland County; Loss of electric service to more than 50,000 customers for 1 hour or more.-Severe Weather Unknown 150000
2020 11 11/15/2020 2:52 PM 11/16/2020 5:59 AM 15 Hours, 7 Minutes Cleveland Electric Illum Co RF Ohio: Loss of electric service to more than 50,000 customers for 1 hour or more.-Severe Weather Unknown 96809
2020 11 11/15/2020 3:08 PM 11/15/2020 10:30 PM 7 Hours, 22 Minutes Ohio Edison Co RF Ohio: Loss of electric service to more than 50,000 customers for 1 hour or more.-Severe Weather Unknown 123361
2020 11 11/15/2020 3:37 PM 11/17/2020 12:15 PM 44 Hours, 38 Minutes Consumers Energy Co RF Michigan: Iosco County, Oscoda County, Ogemaw County, Livingston County, Ionia County, Barry County; Loss of electric service to more than 50,000 customers for 1 hour or more.-Severe Weather Unknown 57327
2020 11 11/15/2020 11:05 PM 11/16/2020 5:00 AM 5 Hours, 55 Minutes ISO New England NPCC Connecticut: Massachusetts: Maine: New Hampshire: Rhode Island: Vermont: Loss of electric service to more than 50,000 customers for 1 hour or more.-Severe Weather Unknown 62408
2020 11 11/30/2020 2:33 PM 11/30/2020 5:20 PM 2 Hours, 47 Minutes El Paso Electric TRE Texas: El Paso County; Unexpected Transmission loss within its area, contrary to design, of three or more Bulk Electric System Facilities caused by a common disturbance (excluding successful automatic reclosing).-Transmission Interruption 0 0
2020 11 11/30/2020 4:24 PM 12/01/2020 2:25 PM 22 Hours, 1 Minutes ISO New England NPCC Massachusetts: Maine: Connecticut: Rhode Island: Vermont: New Hampshire: Loss of electric service to more than 50,000 customers for 1 hour or more.-Severe Weather Unknown 116000
2020 12 12/01/2020 12:32 PM 12/01/2020 10:50 PM 10 Hours, 18 Minutes Cleveland Electric Illum Co RF Ohio: Loss of electric service to more than 50,000 customers for 1 hour or more.-Severe Weather Unknown 170190
2020 12 12/03/2020 12:44 AM 12/05/2020 11:03 AM 58 Hours, 19 Minutes San Diego Gas & Electric Co WECC California: San Diego County; Loss of electric service to more than 50,000 customers for 1 hour or more.-Severe Weather 93 73000
2020 12 12/03/2020 9:01 AM 12/03/2020 9:03 AM 0 Hours, 2 Minutes Public Service Company of Colorado WECC Colorado: Unexpected Transmission loss within its area, contrary to design, of three or more Bulk Electric System Facilities caused by a common disturbance (excluding successful automatic reclosing).-Transmission Interruption 89 0
2020 12 12/03/2020 10:57 AM 12/04/2020 3:02 PM 28 Hours, 5 Minutes Southern California Edison Co WECC California: Kern County, Los Angeles County, Orange County, Riverside County, San Bernardino County, San Diego County, Tulare County, Ventura County; Loss of electric service to more than 50,000 customers for 1 hour or more.-Severe Weather 132 51686
2020 12 12/05/2020 4:40 PM . . . Hours, . Minutes ISO New England NPCC Connecticut: Massachusetts: Maine: New Hampshire: Rhode Island: Vermont: Loss of electric service to more than 50,000 customers for 1 hour or more.-Severe Weather Unknown 271231
2020 12 12/07/2020 6:10 PM 12/08/2020 9:09 PM 26 Hours, 59 Minutes Southern California Edison Co WECC California: Kern County, Los Angeles County, Orange County, Riverside County, San Bernardino County, Ventura County, Tulare County; Loss of electric service to more than 50,000 customers for 1 hour or more.-Severe Weather 286 76234
2020 12 12/13/2020 6:47 AM 12/13/2020 7:36 AM 0 Hours, 49 Minutes Southern California Edison Co WECC California: Uncontrolled loss of 200 Megawatts or more of firm system loads for 15 minutes or more from a single incident for entities with previous year's peak demand less than or equal to 3,000 Megawatts.-System Operations 298 159239
2020 12 12/16/2020 11:20 PM 12/17/2020 7:20 AM 8 Hours, 0 Minutes American Electric Power - (SPP Reliability Region) MRO Oklahoma: Unexpected Transmission loss within its area, contrary to design, of three or more Bulk Electric System Facilities caused by a common disturbance (excluding successful automatic reclosing).-Transmission Interruption Unknown Unknown
2020 12 12/17/2020 8:07 AM 12/17/2020 8:32 AM 0 Hours, 25 Minutes Pacific Gas & Electric Co WECC California: Electrical System Separation (Islanding) where part or parts of power grid remain(s) operational in an otherwise blacked out area or within the partial failure of an integrated electrical system.-Severe Weather 35 17000
2020 12 12/24/2020 11:40 PM . . . Hours, . Minutes Exelon Corporation/PECO RF Pennsylvania: Bucks County, Chester County, Delaware County, Montgomery County, Philadelphia County, York County; Loss of electric service to more than 50,000 customers for 1 hour or more.-Severe Weather/Distribution Interruption Unknown 68114
2020 12 12/25/2020 7:55 AM 12/25/2020 4:45 PM 8 Hours, 50 Minutes ISO New England NPCC Connecticut: Maine: New Hampshire: Massachusetts: Rhode Island: Vermont: Loss of electric service to more than 50,000 customers for 1 hour or more.-Severe Weather Unknown 19000

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