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Electric Power Monthly

Data for November 2017  |  Release Date: January 24, 2018  |  Next Release: February 26, 2018 
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SAS Output
Table B.1 Major Disturbances and Unusual Occurrences, Year-to-Date 2017

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
2017 1 01/08/2017 9:07 AM 01/13/2017 2:30 PM 125 Hours, 23 Minutes Pacific Gas & Electric Co WECC California: Loss of electric service to more than 50,000 customers for 1 hour or more-Severe Weather Unknown 106000
2017 1 01/08/2017 11:59 PM ongoing ongoing California Department of Water Resources WECC California: Fuel supply emergencies that could impact electric power system adequacy or reliability-Fuel Supply Deficiency 0 0
2017 1 01/10/2017 7:30 PM 01/13/2017 2:30 PM 67 Hours, 0 Minutes Pacific Gas & Electric Co WECC California: Loss of electric service to more than 50,000 customers for 1 hour or more-Severe Weather Unknown 87000
2017 1 01/15/2017 6:35 AM 01/15/2017 7:44 AM 1 Hours, 9 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-Transmission Disruption 176 126000
2017 1 01/15/2017 9:27 AM 01/17/2017 1:58 AM 40 Hours, 31 Minutes Oklahoma Municipal Power Authority SPP Oklahoma: Harper County; Electrical System Separation (Islanding) where part or parts of a power grid remain(s) operational in an otherwise blacked out area or within the partial failure of an integrated electrical system-Severe Weather 1 788
2017 1 01/18/2017 6:05 PM 01/19/2017 12:05 AM 6 Hours, 0 Minutes Pacific Gas & Electric Co WECC California: Loss of electric service to more than 50,000 customers for 1 hour or more-Severe Weather Unknown 75000
2017 1 01/22/2017 4:15 AM 01/24/2017 2:00 PM 57 Hours, 45 Minutes Pacific Gas & Electric Co WECC California: Loss of electric service to more than 50,000 customers for 1 hour or more-Severe Weather 97 64000
2017 1 01/22/2017 6:00 AM ongoing ongoing California Department of Water Resources WECC California: Fuel supply emergencies that could impact electric power system adequacy or reliability-Fuel Supply Deficiency 0 0
2017 1 01/22/2017 4:00 PM 01/23/2017 3:26 AM 11 Hours, 26 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 100 29965
2017 2 02/02/2017 1:04 AM 02/02/2017 5:00 AM 3 Hours, 56 Minutes Public Service Company of New Mexico WECC New Mexico: Bernalillo County, Santa Fe County; Uncontrolled loss of 300 Megawatts or more of firm system loads for more than 15 minutes from a single incident-Transmission Interruption 396 149223
2017 2 02/02/2017 1:11 AM ongoing ongoing Peak Reliability WECC New Mexico: Bernalillo County; Uncontrolled loss of 300 Megawatts or more of firm system loads for more than 15 minutes from a single incident-Transmission Interruption 400 Unknown
2017 2 02/13/2017 1:00 PM 02/15/2017 1:35 PM 48 Hours, 35 Minutes North Carolina Mun Power Agny #1 SERC North Carolina: Union County; Physical attack that could potentially impact electric power system adequacy or reliability; or vandalism which targets components of any security systems-Vandalism 0 0
2017 2 02/17/2017 8:09 AM 02/22/2017 7:30 PM 131 Hours, 21 Minutes Pacific Gas & Electric Co WECC California: Loss of electric service to more than 50,000 customers for 1 hour or more-Severe Weather 254 169250
2017 2 02/17/2017 1:00 PM 02/17/2017 1:15 PM 0 Hours, 15 Minutes Nevada Power Company d/b/a NV Energy WECC Nevada: Clark County; Physical attack that could potentially impact electric power system adequacy or reliability; or vandalism which targets components of any security systems-Vandalism 0 0
2017 2 02/17/2017 3:00 PM 02/20/2017 11:00 AM 68 Hours, 0 Minutes LADWP WECC California: Los Angeles County; Loss of electric service to more than 50,000 customers for 1 hour or more-Severe Weather Unknown 111591
2017 3 03/01/2017 8:30 AM 03/01/2017 2:00 PM 5 Hours, 30 Minutes Tennessee Valley Authority SERC Tennessee: Kentucky: Loss of electric service to more than 50,000 customers for 1 hour or more-Severe Weather Unknown 58000
2017 3 03/01/2017 11:49 AM 03/02/2017 9:30 PM 33 Hours, 41 Minutes American Electric Power RFC Kentucky: West Virginia: Loss of electric service to more than 50,000 customers for 1 hour or more-Severe Weather Unknown 98575
2017 3 03/02/2017 12:20 PM 03/02/2017 11:45 PM 11 Hours, 25 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 54316
2017 3 03/06/2017 8:00 PM 03/07/2017 1:00 AM 5 Hours, 0 Minutes Kansas City Power & Light Co SERC Missouri: Jackson County, Platte County, Cass County, Lafayette County, Chariton County, Carroll County, Clay County, Johnson County; Loss of electric service to more than 50,000 customers for 1 hour or more-Severe Weather Unknown 97734
2017 3 03/08/2017 9:30 AM 03/11/2017 5:00 AM 67 Hours, 30 Minutes Consumers Energy Co RFC Michigan: Jackson County, Calhoun County, Ingham County, Hillsdale County, Washtenaw County, Kent County, Ottawa County, Midland County, Saginaw County; Loss of electric service to more than 50,000 customers for 1 hour or more-Severe Weather Unknown 343000
2017 3 03/08/2017 11:30 AM 03/08/2017 7:52 PM 8 Hours, 22 Minutes Cleveland Electric Illum Co RFC Ohio Loss of electric service to more than 50,000 customers for 1 hour or more-Severe Weather Unknown 71012
2017 3 03/08/2017 12:00 PM 03/11/2017 11:31 AM 71 Hours, 31 Minutes Detroit Edison Co RFC Michigan Loss of electric service to more than 50,000 customers for 1 hour or more-Severe Weather Unknown 800000
2017 3 03/08/2017 1:30 PM 03/08/2017 4:30 PM 3 Hours, 0 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/Transmission Interruption Unknown 106869
2017 3 03/08/2017 3:33 PM ongoing ongoing Rochester Gas & Electric Corp NPCC New York Loss of electric service to more than 50,000 customers for 1 hour or more-Severe Weather Unknown 50000
2017 3 03/14/2017 12:32 PM ongoing ongoing ISO New England NPCC Connecticut: Massachusetts: Rhode Island: New Hampshire: Maine: Vermont: Loss of electric service to more than 50,000 customers for 1 hour or more-Severe Weather Unknown 69647
2017 3 03/21/2017 8:00 PM 03/22/2017 9:15 AM 13 Hours, 15 Minutes Southern Company SERC Georgia Loss of electric service to more than 50,000 customers for 1 hour or more-Severe Weather 857 257000
2017 3 03/29/2017 3:30 AM 03/31/2017 6:00 AM 50 Hours, 30 Minutes Oncor Electric Delivery Company LLC TRE Texas Loss of electric service to more than 50,000 customers for 1 hour or more-Severe Weather Unknown 175000
2017 4 04/03/2017 11:00 AM 04/03/2017 8:00 PM 9 Hours, 0 Minutes Southern Company SERC Alabama, Georgia Loss of electric service to more than 50,000 customers for 1 hour or more-Severe Weather 290 86330
2017 4 04/06/2017 7:00 PM ongoing ongoing Pacific Gas & Electric Co WECC California Loss of electric service to more than 50,000 customers for 1 hour or more-Severe Weather Unknown 100000
2017 4 04/07/2017 4:33 AM 04/07/2017 8:20 AM 3 Hours, 47 Minutes Pacificorp WECC Oregon Loss of electric service to more than 50,000 customers for 1 hour or more-Severe Weather 100 64852
2017 4 04/07/2017 8:15 AM 04/08/2017 12:14 AM 15 Hours, 59 Minutes Portland General Electric Co WECC Oregon: Multnomah County, Washington County, Marion County, Clackamas County Loss of electric service to more than 50,000 customers for 1 hour or more-Severe Weather Unknown 153867
2017 4 04/24/2017 5:32 AM 04/24/2017 6:33 AM 1 Hours, 1 Minutes Duke Energy Carolinas SERC North Carolina: Mecklenburg County Loss of electric service to more than 50,000 customers for 1 hour or more-Severe Weather 240 74698
2017 4 04/30/2017 1:00 AM 04/30/2017 5:45 PM 16 Hours, 45 Minutes Entergy Corp SERC Arkansas, Louisiana, Mississippi Loss of electric service to more than 50,000 customers for 1 hour or more-Severe Weather Unknown 145174
2017 5 05/01/2017 11:14 PM 05/01/2017 11:34 PM 0 Hours, 20 Minutes Pennsylvania Electric Co RFC Ohio Loss of electric service to more than 50,000 customers for 1 hour or more-Severe Weather Unknown 92390
2017 5 05/03/2017 6:58 PM 05/03/2017 9:15 PM 2 Hours, 17 Minutes Southern California Edison Co WECC California Load shedding of 100 Megawatts or more implemented under emergency operational policy-Generation Inadequacy 572 0
2017 5 05/03/2017 7:05 PM 05/03/2017 9:00 PM 1 Hours, 55 Minutes California ISO WECC California Load shedding of 100 Megawatts or more implemented under emergency operational policy-Generation Inadequacy 878 Unknown
2017 5 05/04/2017 5:00 AM 05/04/2017 10:00 PM 17 Hours, 0 Minutes Southern Company SERC Alabama: Georgia Loss of electric service to more than 50,000 customers for 1 hour or more-Severe Weather 200 60377
2017 5 05/07/2017 5:15 AM ongoing ongoing California Department of Water Resources WECC California: Fresno County Fuel supply emergencies that could impact electric power system adequacy or reliability-Fuel Supply Deficiency 0 0
2017 5 05/07/2017 11:30 PM 05/08/2017 5:00 AM 5 Hours, 30 Minutes Owensboro Municipal Utilities SERC Kentucky: Daviess County Public appeal to reduce the use of electricity for purposes of maintaining the continuity of the electric power system-Generation Inadequacy 80 0
2017 5 05/19/2017 5:30 AM ongoing ongoing Ameren Missouri SERC Missouri: St. Louis County Loss of electric service to more than 50,000 customers for 1 hour or more-Severe Weather Unknown 70696
2017 5 05/27/2017 11:00 PM ongoing ongoing Tennessee Valley Authority SERC Tennessee: Shelby County, Putnam County, Knox County, Davidson County, Hamilton County; Alabama: Madison County Loss of electric service to more than 50,000 customers for 1 hour or more-Severe Weather Unknown 116000
2017 5 05/27/2017 11:10 PM ongoing ongoing Memphis Light Gas and Water Division SERC Tennessee: Shelby County Loss of electric service to more than 50,000 customers for 1 hour or more-Severe Weather 391 188000
2017 5 05/28/2017 7:30 PM 05/29/2017 10:00 PM 26 Hours, 30 Minutes American Electric Power - (SPP Reliability Region) TRE Texas: Louisiana Loss of electric service to more than 50,000 customers for 1 hour or more-Severe Weather Unknown 103000
2017 5 05/28/2017 7:30 PM 05/29/2017 10:00 PM 26 Hours, 30 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 103000
2017 6 06/11/2017 2:39 PM 06/11/2017 5:55 PM 3 Hours, 16 Minutes MISO RFC Michigan Electrical System Separation (Islanding) where part or parts of a power grid remain(s) operational in an otherwise blacked out area or within the partial failure of an integrated electrical system-Transmission Interruption 63 Unknown
2017 7 07/07/2017 3:30 AM 07/08/2017 7:30 PM 40 Hours, 0 Minutes Consumers Energy Co RFC Michigan: Kent County, Ottawa County, Muskegon County, Barry County, Oceana County, Eaton County Loss of electric service to more than 50,000 customers for 1 hour or more-Severe Weather Unknown 160000
2017 7 07/08/2017 6:52 PM 07/09/2017 8:00 AM 13 Hours, 8 Minutes Los Angeles Department of Water & Power WECC California: Los Angeles County Uncontrolled loss of 300 Megawatts or more of firm system loads for more than 15 minutes from a single incident-Transmission Interruption 645 176867
2017 7 07/18/2017 4:23 PM 07/18/2017 6:39 PM 2 Hours, 16 Minutes Western Area Power Administration - Western Area Lower Colorado WECC Nevada Uncontrolled loss of 300 Megawatts or more of firm system loads for more than 15 minutes from a single incident-Severe Weather 0 0
2017 7 07/22/2017 10:00 PM ongoing ongoing KCP&L Greater Missouri Operations Company SERC Missouri Loss of electric service to more than 50,000 customers for 1 hour or more-Severe Weather Unknown 115000
2017 7 07/22/2017 10:00 PM ongoing ongoing Southwest Power Pool, Inc. SERC Missouri Loss of electric service to more than 50,000 customers for 1 hour or more-Severe Weather Unknown 131000
2017 7 07/22/2017 10:00 PM 07/23/2017 12:00 PM 14 Hours, 0 Minutes Kansas City Power & Light Co SERC Missouri: Clay County, Jackson County, Lafayette County, Platte County; Kansas: Johnson County, Miami County, Wyandotte County Loss of electric service to more than 50,000 customers for 1 hour or more-Severe Weather Unknown 112540
2017 7 07/23/2017 4:00 AM ongoing ongoing Ameren Missouri SERC Missouri: Illinois Loss of electric service to more than 50,000 customers for 1 hour or more-Severe Weather Unknown 82000
2017 7 07/27/2017 6:00 AM 07/27/2017 11:29 AM 5 Hours, 29 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
2017 8 08/21/2017 11:41 PM 08/22/2017 12:21 AM 0 Hours, 40 Minutes Pacific Gas & Electric Co WECC California: Plumas County Electrical System Separation (Islanding) where part or parts of a power grid remain(s) operational in an otherwise blacked out area or within the partial failure of an integrated electrical system-System Operations 1 2
2017 8 08/25/2017 6:17 PM 09/02/2017 5:00 PM 190 Hours, 43 Minutes American Electric Power - Texas TRE Texas: Matagorda County, Nueces County, Aransas County, Refugio County, San Patricio County, Calhoun County, Victoria County, Jackson County, Live Oak County, Jim Wells County, Bee County, Lavaca County Loss of electric service to more than 50,000 customers for 1 hour or more-Severe Weather Unknown 220400
2017 8 08/25/2017 6:30 PM 09/05/2017 5:00 PM 262 Hours, 30 Minutes ERCOT TRE Texas Loss of electric service to more than 50,000 customers for 1 hour or more-Severe Weather Unknown 330000
2017 8 08/26/2017 12:39 AM 08/26/2017 12:52 AM 0 Hours, 13 Minutes ERCOT TRE Texas Electrical System Separation (Islanding) where part or parts of a 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
2017 8 08/26/2017 6:26 AM 09/08/2017 12:00 AM 305 Hours, 34 Minutes CenterPoint Energy TRE Texas Loss of electric service to more than 50,000 customers for 1 hour or more-Severe Weather Unknown 1076868
2017 8 08/27/2017 5:10 AM 09/08/2017 12:00 AM 282 Hours, 50 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 1076868
2017 8 08/30/2017 2:15 AM ongoing ongoing Entergy Corp TRE Texas Loss of electric service to more than 50,000 customers for 1 hour or more-Severe Weather Unknown 78500
2017 8 08/31/2017 2:49 PM 08/31/2017 5:14 PM 2 Hours, 25 Minutes Southern California Edison Co WECC California: Los Angeles County Load shedding of 100 Megawatts or more implemented under emergency operational policy-Severe Weather 100 0
2017 9 09/01/2017 3:41 PM 09/01/2017 8:30 PM 4 Hours, 49 Minutes Southern California Edison Co WECC California: Load shedding of 100 Megawatts or more implemented under emergency operational policy-Severe Weather 337 0
2017 9 09/09/2017 12:00 AM ongoing ongoing Tampa Electric Company FRCC Florida: Hillsborough County, Pasco County, Polk County; Loss of electric service to more than 50,000 customers for 1 hour or more-Severe Weather 1275 425000
2017 9 09/09/2017 12:30 PM ongoing ongoing Florida Power & Light FRCC Florida: Loss of electric service to more than 50,000 customers for 1 hour or more-Severe Weather Unknown 3500000
2017 9 09/10/2017 6:35 PM 09/13/2017 5:00 PM 70 Hours, 25 Minutes Duke Energy Florida FRCC Florida: Alachua County, Bay County, Brevard County, Citrus County, Columbia County, Dixie County, Flagler County, Franklin County, Gilchrist County, Gulf County, Hamilton County, Hardee County, Hernando County, Highlands County, Jefferson County, Lafayette County, Lake County, Leon County, Levy County, Madison County, Marion County, Orange County, Osceola County, Pasco County, Pinellas County, Po Loss of electric service to more than 50,000 customers for 1 hour or more-Severe Weather 4500 1000000
2017 9 09/10/2017 8:37 PM ongoing ongoing Seminole Electric Cooperative Inc FRCC Florida: Loss of electric service to more than 50,000 customers for 1 hour or more-Severe Weather Unknown 452555
2017 9 09/11/2017 12:30 AM ongoing ongoing Lakeland Electric FRCC Florida: Loss of electric service to more than 50,000 customers for 1 hour or more-Severe Weather 200 20000
2017 9 09/11/2017 2:27 AM 09/15/2017 8:44 PM 114 Hours, 17 Minutes Southern Company SERC Georgia: Loss of electric service to more than 50,000 customers for 1 hour or more-Severe Weather 132 39659
2017 9 09/11/2017 12:55 PM 09/12/2017 8:00 AM 19 Hours, 5 Minutes South Carolina Electric and Gas SERC South Carolina: Loss of electric service to more than 50,000 customers for 1 hour or more-Severe Weather 687 154832
2017 9 09/11/2017 5:30 PM 09/13/2017 9:30 AM 40 Hours, 0 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 365 265729
2017 10 10/08/2017 3:00 AM ongoing ongoing Southern Company SERC Alabama: Florida: Mississippi: Loss of electric service to more than 50,000 customers for 1 hour or more-Severe Weather 306 91945
2017 10 10/09/2017 2:03 AM 10/17/2017 1:30 PM 203 Hours, 27 Minutes Pacific Gas & Electric Co WECC California: Loss of electric service to more than 50,000 customers for 1 hour or more-Severe Weather/Transmission Interruption 177 117900
2017 10 10/09/2017 6:44 AM ongoing ongoing Pacific Gas & Electric Co WECC California: Electrical System Separation (Islanding) where part or parts of a power grid remain(s) operational in an otherwise blacked out area or within the partial failure of an integrated electrical system-Severe Weather 100 Unknown
2017 10 10/12/2017 9:09 AM ongoing ongoing Clarksdale Public Utilities SERC Mississippi: Coahoma County; Public appeal to reduce the use of electricity for purposes of maintaining the continuity of the electric power system-System Operations Unknown Unknown
2017 10 10/16/2017 3:45 PM 10/16/2017 4:09 PM 0 Hours, 24 Minutes Bonneville Power Administration WECC Washington: Montana: Electrical System Separation (Islanding) where part or parts of a power grid remain(s) operational in an otherwise blacked out area or within the partial failure of an integrated electrical system-Transmission Interruption 0 0
2017 10 10/16/2017 3:55 PM 10/16/2017 4:10 PM 0 Hours, 15 Minutes Peak Reliability WECC Washington: Electrical System Separation (Islanding) where part or parts of a power grid remain(s) operational in an otherwise blacked out area or within the partial failure of an integrated electrical system-Transmission Interruption 0 0
2017 10 10/20/2017 3:44 AM 10/20/2017 3:45 AM 0 Hours, 1 Minutes Peak Reliability WECC Washington: Uncontrolled loss of 300 Megawatts or more of firm system loads for more than 15 minutes from a single incident-Severe Weather 900 Unknown
2017 10 10/22/2017 8:45 AM 10/22/2017 2:00 PM 5 Hours, 15 Minutes Entergy Corp SERC Louisiana: Mississippi: Arkansas: Texas: Loss of electric service to more than 50,000 customers for 1 hour or more-Severe Weather Unknown Unknown
2017 10 10/23/2017 5:50 PM 10/24/2017 6:17 PM 24 Hours, 27 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 440 115144
2017 10 10/26/2017 8:17 AM 10/26/2017 8:41 AM 0 Hours, 24 Minutes Peak Reliability WECC Washington: Clark County; Electrical System Separation (Islanding) where part or parts of a power grid remain(s) operational in an otherwise blacked out area or within the partial failure of an integrated electrical system-Transmission Interruption 0 0
2017 10 10/26/2017 8:17 AM 10/26/2017 8:41 AM 0 Hours, 24 Minutes Bonneville Power Administration WECC Washington: Whatcom County; Montana: Electrical System Separation (Islanding) where part or parts of a power grid remain(s) operational in an otherwise blacked out area or within the partial failure of an integrated electrical system-Transmission Interruption 0 0
2017 10 10/29/2017 11:40 PM 11/01/2017 6:08 PM 66 Hours, 28 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 Unknown 310453
2017 11 11/01/2017 3:40 PM 11/01/2017 10:00 PM 6 Hours, 20 Minutes Owensboro Municipal Utilities SERC Kentucky: Daviess County; Public appeal to reduce the use of electricity for purposes of maintaining the continuity of the electric power system-Generation Inadequacy 0 0
2017 11 11/05/2017 7:35 PM 11/05/2017 11:09 PM 3 Hours, 34 Minutes Ohio Edison Co RF Ohio: Loss of electric service to more than 50,000 customers for 1 hour or more-Severe Weather Unknown 89216
2017 11 11/13/2017 2:00 AM 11/15/2017 8:17 AM 54 Hours, 17 Minutes Puget Sound Energy WECC Washington: Island County, King County, Kitsap County, Thurston County, Skagit County, Whatcom County; Loss of electric service to more than 50,000 customers for 1 hour or more-Severe Weather Unknown 236100
2017 11 11/13/2017 4:33 PM 11/16/2017 6:00 AM 61 Hours, 27 Minutes Seattle City Light, Sytem Control Center WECC Washington: King County; Loss of electric service to more than 50,000 customers for 1 hour or more-Severe Weather 85 68430

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