Electric Power Monthly

Data for September 2016  |  Release Date: November 29, 2016  |  Next Release: December 23, 2016 
|  full report

Previous Issues

SAS Output
Table B.1 Major Disturbances and Unusual Occurrences, Year-to-Date 2016

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
2016 1 01/10/2016 8:46 PM 01/11/2016 5:25 AM 8 Hours, 39 Minutes ISO New England NPCC Maine: Connecticut: Massachusetts: Vermont: New Hampshire: Rhode Island: Loss of electric service to more than 50,000 customers for 1 hour or more-Weather Unknown 59859
2016 1 01/22/2016 3:52 PM 01/24/2016 12:30 PM 44 Hours, 38 Minutes Duke Energy Progress SERC North Carolina: South Carolina: Loss of electric service to more than 50,000 customers for 1 hour or more-Weather Unknown 150000
2016 1 01/23/2016 7:49 AM 01/23/2016 9:05 AM 1 Hours, 16 Minutes FirstEnergy Corp. Jersey Central Power & Light RFC New Jersey: Loss of electric service to more than 50,000 customers for 1 hour or more-Weather Unknown 50900
2016 2 02/05/2016 11:21 AM 02/06/2016 3:48 PM 28 Hours, 27 Minutes ISO New England NPCC Connecticut: Massachusetts: Rhode Island: Loss of electric service to more than 50,000 customers for 1 hour or more-Weather Unknown 115057
2016 2 02/13/2016 12:44 PM 02/13/2016 4:27 PM 3 Hours, 43 Minutes Pacific Gas & Electric Co SERC 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-Islanding 7 4300
2016 2 02/16/2016 8:35 AM 02/16/2016 5:28 PM 8 Hours, 53 Minutes American Electric Power - (RFC Reliability Region) (8400 Smiths Mill Road, New Albany Ohio 43054) RFC Virginia: Roanoke County, Montgomery County; West Virginia: Kanawha County, Cabell County; Tennessee: Sullivan County; Loss of electric service to more than 50,000 customers for 1 hour or more-Weather Unknown 52640
2016 2 02/19/2016 10:00 PM 02/20/2016 11:13 PM 25 Hours, 13 Minutes Detroit Edison Co RFC Michigan Loss of electric service to more than 50,000 customers for 1 hour or more-Weather Unknown 145314
2016 2 02/24/2016 2:45 PM 02/25/2016 5:00 AM 14 Hours, 15 Minutes Duke Energy Carolinas SERC North Carolina: South Carolina Loss of electric service to more than 50,000 customers for 1 hour or more-Weather 400 284610
2016 2 02/25/2016 1:44 AM 02/25/2016 2:45 PM 13 Hours, 1 Minutes ISO New England NPCC Connecticut: Maine: Massachusetts: Rhode Island: Vermont: Loss of electric service to more than 50,000 customers for 1 hour or more-Weather Unknown 114190
2016 2 02/26/2016 12:01 AM ongoing ongoing 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
2016 3 03/01/2016 3:00 PM ongoing ongoing Puget Sound Energy WECC Washington: King County, Whatcom County, Kitsap County, Skagit County; Loss of electric service to more than 50,000 customers for 1 hour or more-Weather Unknown 56000
2016 3 03/03/2016 11:00 AM 04/16/2016 7:47 PM 1,064 Hours, 47 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
2016 3 03/23/2016 5:00 AM 03/25/2016 11:59 PM 66 Hours, 59 Minutes Xcel Energy/Public Service Company of Colorado WECC Colorado: Denver, City and County of[12]; Loss of electric service to more than 50,000 customers for 1 hour or more-Weather 0 0
2016 4 04/02/2016 11:08 AM 04/02/2016 11:33 AM 0 Hours, 25 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
2016 4 04/18/2016 5:05 AM 04/20/2016 7:55 AM 50 Hours, 50 Minutes CenterPoint Energy TRE Texas: Harris County Loss of electric service to more than 50,000 customers for 1 hour or more-Weather Unknown 415103
2016 4 04/27/2016 5:50 AM 04/28/2016 1:35 AM 19 Hours, 45 Minutes CenterPoint Energy TRE Texas: Harris County Loss of electric service to more than 50,000 customers for 1 hour or more-Weather Unknown 214864
2016 5 05/08/2016 9:12 AM ongoing ongoing 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-Islanding Unknown Unknown
2016 5 05/10/2016 8:45 PM 05/13/2016 3:00 AM 54 Hours, 15 Minutes Oncor Electric Delivery Company LLC TRE Texas: Dallas County, Tarrant County, Parker County; Loss of electric service to more than 50,000 customers for 1 hour or more-Distribution Interruption Unknown 85000
2016 5 05/19/2016 9:36 PM 05/20/2016 1:00 AM 3 Hours, 24 Minutes Pacificorp WECC Utah: Uncontrolled loss of 300 Megawatts or more of firm system loads for more than 15 minutes from a single incident-System Operations 461 85179
2016 5 05/20/2016 12:00 AM 05/22/2016 5:00 AM 53 Hours, 0 Minutes Entergy Services, Inc. SERC Louisiana: Loss of electric service to more than 50,000 customers for 1 hour or more-Distribution Interruption Unknown 85000
2016 5 05/20/2016 1:15 AM ongoing ongoing Entergy Transmission - SOC SERC Louisiana: Loss of electric service to more than 50,000 customers for 1 hour or more-Weather Unknown 57184
2016 5 05/31/2016 7:30 AM 06/13/2016 7:27 AM 311 Hours, 57 Minutes Upstate New York Power Producers NPCC New York: Tompkins County; Fuel supply emergencies that could impact electric power system adequacy or reliability-Fuel Supply Deficiency 150 Unknown
2016 6 06/17/2016 3:40 PM 06/18/2016 8:34 AM 16 Hours, 54 Minutes Southern Company SERC Georgia, Alabama, Mississippi, Florida Loss of electric service to more than 50,000 customers for 1 hour or more-Weather 304 91260
2016 7 07/05/2016 2:45 AM 07/06/2016 3:00 AM 24 Hours, 15 Minutes Oncor Electric Delivery Company LLC TRE Texas: Dallas County, Tarrant County Loss of electric service to more than 50,000 customers for 1 hour or more-Severe Weather Unknown 52000
2016 7 07/05/2016 5:30 PM 07/06/2016 4:00 PM 22 Hours, 30 Minutes Northern States Power Co MRO Minnesota, Wisconsin Loss of electric service to more than 50,000 customers for 1 hour or more-Severe Weather Unknown 250000
2016 7 07/07/2016 4:20 AM 07/07/2016 8:00 AM 3 Hours, 40 Minutes Kansas City Power & Light Co SERC Kansas: Johnson County; Missouri: Jackson County, Platte County, Cass County, Buchanan County, Atchison County, Andrew County, Clay County, Nodaway County Loss of electric service to more than 50,000 customers for 1 hour or more-Severe Weather Unknown 58500
2016 7 07/08/2016 6:00 PM ongoing ongoing American Electric Power - (RFC Reliability Region) (8400 Smiths Mill Road, New Albany Ohio 43054) RFC West Virginia: Virginia Loss of electric service to more than 50,000 customers for 1 hour or more-Severe Weather Unknown 62961
2016 7 07/08/2016 7:00 PM 07/09/2016 12:00 AM 5 Hours, 0 Minutes Detroit Edison Co RFC Michigan: Wayne County, Oakland County, Macomb County, St. Clair County, Lapeer County, Tuscola County, Sanilac County, Huron County Loss of electric service to more than 50,000 customers for 1 hour or more-Severe Weather Unknown 160895
2016 7 07/08/2016 8:50 PM 07/09/2016 7:25 PM 22 Hours, 35 Minutes Duke Energy Carolinas SERC North Carolina Loss of electric service to more than 50,000 customers for 1 hour or more-Severe Weather 600 203345
2016 7 07/09/2016 5:45 PM 07/11/2016 2:00 PM 44 Hours, 15 Minutes Oncor Electric Delivery Company LLC TRE Texas: Dallas County Loss of electric service to more than 50,000 customers for 1 hour or more-Severe Weather Unknown 62000
2016 7 07/12/2016 2:10 PM 07/12/2016 8:33 PM 6 Hours, 23 Minutes Puerto Rico Electric Power Authority PR Puerto Rico Voltage Reduction-System Operations 450 218000
2016 7 07/13/2016 3:00 PM ongoing ongoing Memphis Light Gas and Water Division SERC Tennessee: Shelby County Public Appeal-System Operations Unknown Unknown
2016 7 07/14/2016 2:44 PM 07/15/2016 4:00 AM 13 Hours, 16 Minutes American Electric Power - (SPP Reliability Region) SPP Oklahoma Loss of electric service to more than 50,000 customers for 1 hour or more-Severe Weather Unknown 96966
2016 7 07/14/2016 4:30 PM 07/16/2016 12:00 AM 31 Hours, 30 Minutes Entergy Services, Inc. SPP, SERC, Arkansas: Louisiana: Mississippi: Texas Loss of electric service to more than 50,000 customers for 1 hour or more-Severe Weather Unknown 170244
2016 7 07/14/2016 5:30 PM 07/16/2016 8:00 PM 50 Hours, 30 Minutes Oklahoma Gas & Electric Co SPP Oklahoma: Arkansas Loss of electric service to more than 50,000 customers for 1 hour or more-Severe Weather Unknown 7300
2016 7 07/19/2016 3:45 PM 07/19/2016 7:25 PM 3 Hours, 40 Minutes Pacificorp WECC Idaho Islanding, Uncontrolled Loss 300+ MW-System Operations 485 Unknown
2016 7 07/19/2016 3:45 PM 07/19/2016 7:29 PM 3 Hours, 44 Minutes Bonneville Power Administration WECC Idaho Islanding, Uncontrolled Loss 300+ MW-System Operations 290 Unknown
2016 7 07/21/2016 7:21 PM 07/22/2016 12:09 AM 4 Hours, 48 Minutes Puerto Rico Electric Power Authority PR Puerto Rico Load Shed 100+ MW, Voltage Reduction-System Operations 200 266000
2016 7 07/22/2016 11:50 PM 07/23/2016 9:10 AM 9 Hours, 20 Minutes ISO New England NPCC Massachusetts: Connecticut: Rhode Island: New Hampshire: Vermont: Maine Loss of electric service to more than 50,000 customers for 1 hour or more-Severe Weather Unknown 57058
2016 7 07/23/2016 3:15 PM 07/23/2016 7:53 PM 4 Hours, 38 Minutes CAmbria Cogen Company RFC Pennsylvania: Cambria County Voltage Reduction-System Operations 87 Unknown
2016 7 07/23/2016 7:30 PM 07/24/2016 7:30 AM 12 Hours, 0 Minutes ISO New England NPCC Connecticut: Massachusetts: New Hampshire: Vermont: Rhode Island Loss of electric service to more than 50,000 customers for 1 hour or more-Severe Weather Unknown 101073
2016 7 07/25/2016 6:51 PM 07/26/2016 2:19 AM 7 Hours, 28 Minutes Puerto Rico Electric Power Authority PR Puerto Rico Voltage Reduction-System Operations 0 0
2016 7 07/26/2016 6:51 PM 07/27/2016 1:45 AM 6 Hours, 54 Minutes Puerto Rico Electric Power Authority PR Puerto Rico Voltage Reduction-System Operations 25 37100
2016 7 07/27/2016 6:50 PM 07/28/2016 1:38 AM 6 Hours, 48 Minutes Puerto Rico Electric Power Authority PR Puerto Rico Voltage Reduction-System Operations 80 106300
2016 7 07/28/2016 6:51 PM 07/29/2016 2:02 AM 7 Hours, 11 Minutes Puerto Rico Electric Power Authority PR Puerto Rico Voltage Reduction-System Operations 22 21600
2016 7 07/29/2016 7:09 PM 07/29/2016 7:57 PM 0 Hours, 48 Minutes Puerto Rico Electric Power Authority PR Puerto Rico Voltage Reduction-System Operations 0 0
2016 8 08/07/2016 6:39 PM 08/07/2016 8:27 PM 1 Hours, 48 Minutes 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-System Operations Unknown Unknown
2016 8 08/10/2016 6:00 AM ongoing ongoing 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
2016 8 08/11/2016 4:30 PM 08/11/2016 7:15 PM 2 Hours, 45 Minutes FirstEnergy Corp RFC Ohio: Loss of electric service to more than 50,000 customers for 1 hour or more-Severe Weather Unknown 62140
2016 8 08/13/2016 11:42 AM 08/13/2016 2:07 PM 2 Hours, 25 Minutes Broad River Energy, LLC SERC South Carolina: Uncontrolled loss of 300 Megawatts or more of firm system loads for more than 15 minutes from a single incident-System Operations 506 0
2016 8 08/23/2016 5:00 PM 08/24/2016 12:05 AM 7 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 72200
2016 8 08/24/2016 6:13 PM 08/24/2016 7:14 PM 1 Hours, 1 Minutes Puerto Rico Electric Power Authority PR Puerto Rico: Uncontrolled loss of 300 Megawatts or more of firm system loads for more than 15 minutes from a single incident-System Operations 600 400000
2016 8 08/24/2016 7:18 PM 08/24/2016 7:47 PM 0 Hours, 29 Minutes Peak Reliability WECC Washington: King 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-Islanding 9232 Unknown
2016 8 08/31/2016 9:45 AM 08/31/2016 9:55 AM 0 Hours, 10 Minutes Peak Reliability WECC Colorado: 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
2016 8 08/31/2016 2:52 PM ongoing ongoing 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-Islanding 0 0
2016 9 09/01/2016 10:00 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 100 Unknown
2016 9 09/02/2016 12:40 AM 09/04/2016 8:00 PM 67 Hours, 20 Minutes City of Tallahassee - (FL) FRCC Florida: Leon County, Wakulla County; Loss of electric service to more than 50,000 customers for 1 hour or more-Severe Weather 450 75000
2016 9 09/02/2016 4:00 AM 09/02/2016 4:00 PM 12 Hours, 0 Minutes Duke Energy Florida FRCC Florida: Alachua County, Bay County, Citrus County, Columbia County, Dixie County, Franklin County, Gilchrist County, Gulf County, Hamilton County, Hardee County, Hernando County, Highlands County, Jefferson County, Lafayette County, Lake County, Levy County, Madison County, Marion County, Orange County, Osceola County, Pasco County, Pinellas County, Polk County, Seminole County, Sumter County, Su Loss of electric service to more than 50,000 customers for 1 hour or more-Severe Weather 225 90000
2016 9 09/02/2016 5:45 AM 09/03/2016 12:30 AM 18 Hours, 45 Minutes Southern Company SERC Georgia: Loss of electric service to more than 50,000 customers for 1 hour or more-Severe Weather Unknown 57000
2016 9 09/06/2016 6:12 PM 09/06/2016 9:24 PM 3 Hours, 12 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-Islanding 300 Unknown
2016 9 09/08/2016 8:30 AM 09/25/2016 12:00 AM 399 Hours, 30 Minutes Upstate New York Power Producers NPCC New York: Tompkins County; Fuel supply emergencies that could impact electric power system adequacy or reliability-Fuel Supply Deficiency 210 Unknown
2016 9 09/08/2016 2:49 PM 09/08/2016 3:03 PM 0 Hours, 14 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-Islanding 0 0
2016 9 09/10/2016 9:42 AM 09/10/2016 9:57 AM 0 Hours, 15 Minutes Peak Reliability WECC Washington: Clark County; Load shedding of 100 Megawatts or more implemented under emergency operational policy-Generation Inadequacy 135 Unknown
2016 9 09/11/2016 12:05 PM 09/11/2016 3:10 PM 3 Hours, 5 Minutes ISO New England NPCC Connecticut: Massachusetts: New Hampshire: Rhode Island: Vermont: Maine: Loss of electric service to more than 50,000 customers for 1 hour or more-Severe Weather Unknown 57960
2016 9 09/12/2016 12:30 PM 09/12/2016 5:56 PM 5 Hours, 26 Minutes Public Service Company of New Mexico WECC New Mexico: Bernalillo County, Sandoval County, Santa Fe County, Valencia County; Load shedding of 100 Megawatts or more implemented under emergency operational policy-Generation Inadequacy 110 53753
2016 9 09/21/2016 2:30 PM 09/24/2016 2:30 AM 60 Hours, 0 Minutes Puerto Rico Electric Power Authority   Puerto Rico: Complete operational failure or shut-down of the transmission and/or distribution electrical system-System Operations 2750 1475000
2016 9 09/22/2016 10:56 AM 09/22/2016 11:41 AM 0 Hours, 45 Minutes Cedar Falls Utilities MRO Iowa: Black Hawk County; Complete operational failure or shut-down of the transmission and/or distribution electrical system-System Operations 69 19124

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