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Data for February 2024 Release Date: April 24, 2024 Next Release Date: May 24, 2024 Full report PDF
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Table B.2 Major Disturbances and Unusual Occurrences, 2023

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
2023 1 01/01/2023 9:55 AM 01/01/2023 10:30 AM 0 Hours, 35 Minutes Western Area Power Administration - Sierra Nevada Region (114 Parkshore Dr. Folsom, CA. 95630) WECC California: Sacramento County; Complete loss of monitoring or control capability at its staffed Bulk Electric System control center for 30 continuous minutes or more.-System Operations 0 0
2023 1 01/05/2023 7:30 AM 01/05/2023 9:30 AM 2 Hours, 0 Minutes Bonneville Power Administration WECC Washington: Lewis County; Physical threat to its Facility excluding weather or natural disaster related threats, which has the potential to degrade the normal operation of the Facility. Or suspicious device or activity at its Facility.-Suspicious Activity 0 0
2023 1 01/05/2023 8:19 AM 01/05/2023 8:20 AM 0 Hours, 1 Minutes Entergy - Transmission Operations Engineering SERC Louisiana: Concordia Parish; 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 23 1631
2023 1 01/06/2023 9:30 AM 01/06/2023 11:30 AM 2 Hours, 0 Minutes American Mun Power-Ohio, Inc RF Ohio: Sandusky County; Physical threat to its Facility excluding weather or natural disaster related threats, which has the potential to degrade the normal operation of the Facility. Or suspicious device or activity at its Facility.-Suspicious Activity Unknown Unknown
2023 1 01/07/2023 10:00 PM 01/08/2023 9:00 PM 23 Hours, 0 Minutes Sacramento Municipal Util Dist WECC California: Sacramento County; Loss of electric service to more than 50,000 customers for 1 hour or more-Severe Weather 458 185434
2023 1 01/12/2023 10:00 AM . . . Hours, . Minutes Sacramento Municipal Util Dist WECC California: Sacramento County; Physical threat to its Facility excluding weather or natural disaster related threats, which has the potential to degrade the normal operation of the Facility. Or suspicious device or activity at its Facility.-Suspicious Activity 0 0
2023 1 01/12/2023 2:00 PM 01/13/2023 3:00 AM 13 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 1158 162000
2023 1 01/13/2023 12:00 AM 01/13/2023 1:00 AM 1 Hours, 0 Minutes Lower Colorado River Authority TRE Texas: Fayette County; Physical threat to its Facility excluding weather or natural disaster related threats, which has the potential to degrade the normal operation of the Facility. Or suspicious device or activity at its Facility.-Suspicious Activity 0 0
2023 1 01/19/2023 11:00 AM 01/19/2023 1:00 PM 2 Hours, 0 Minutes Duke Energy Progress SERC South Carolina: Sumter County; Physical threat to its Facility excluding weather or natural disaster related threats, which has the potential to degrade the normal operation of the Facility. Or suspicious device or activity at its Facility.-Suspicious Activity Unknown Unknown
2023 1 01/23/2023 7:05 AM 01/24/2023 5:17 PM 34 Hours, 12 Minutes ISO New England NPCC Connecticut: Rhode Island: Massachusetts: Vermont: New Hampshire: Maine: Loss of electric service to more than 50,000 customers for 1 hour or more-Severe Weather Unknown 41000
2023 1 01/23/2023 9:21 AM . . . Hours, . Minutes Sacramento Municipal Util Dist WECC California: Sacramento County; Physical threat to its Facility excluding weather or natural disaster related threats, which has the potential to degrade the normal operation of the Facility. Or suspicious device or activity at its Facility.-Suspicious Activity Unknown Unknown
2023 1 01/23/2023 5:00 PM . . . Hours, . Minutes Sacramento Municipal Util Dist WECC California: Sacramento County; Physical threat to its Facility excluding weather or natural disaster related threats, which has the potential to degrade the normal operation of the Facility. Or suspicious device or activity at its Facility.-Suspicious Activity Unknown Unknown
2023 1 01/24/2023 3:25 PM 01/26/2023 8:20 PM 52 Hours, 55 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 100731
2023 1 01/24/2023 5:10 PM 01/24/2023 5:20 PM 0 Hours, 10 Minutes Ravenswood Generating Station NPCC New York: Queens County; Physical threat to its Facility excluding weather or natural disaster related threats, which has the potential to degrade the normal operation of the Facility. Or suspicious device or activity at its Facility.-Suspicious Activity 0 0
2023 1 01/25/2023 3:30 AM 01/25/2023 1:00 PM 9 Hours, 30 Minutes Entergy Corp SERC Arkansas: Texas: Louisiana: Mississippi: Loss of electric service to more than 50,000 customers for 1 hour or more-Severe Weather Unknown 60958
2023 1 01/25/2023 3:57 PM 01/25/2023 5:38 PM 1 Hours, 41 Minutes Brownsville Public Utilities Board TRE Texas: Cameron County; Physical threat to its Facility excluding weather or natural disaster related threats, which has the potential to degrade the normal operation of the Facility. Or suspicious device or activity at its Facility.-Suspicious Activity 0 0
2023 1 01/30/2023 10:30 AM . . . Hours, . Minutes Onward Energy MRO Minnesota: Physical threat to its Bulk Electric System control center, excluding weather or natural disaster related threats, which has the potential to degrade the normal operation of the control center. Or suspicious device or activity at its Bulk Electric System control center.-Suspicious Activity Unknown Unknown
2023 1 01/31/2023 8:15 AM 02/06/2023 5:00 PM 152 Hours, 45 Minutes Oncor Electric Delivery Company LLC TRE Texas: Dallas County, Anderson County, Bosque County, Collin County, Comanche County, Cooke County, Delta County, Denton County, Ellis County, Erath County, Fannin County, Freestone County, Hamilton County, Henderson County, Hill County, Hood County, Hopkins County, Hunt County, Jack County, Johnson County, Kaufman County, Lamar County, Navarro County, Palo Pinto County, Parker County, Rains Count Loss of electric service to more than 50,000 customers for 1 hour or more-Severe Weather Unknown 360000
2023 2 02/01/2023 5:00 AM 02/04/2023 10:39 PM 89 Hours, 39 Minutes Austin Energy TRE Texas: Travis County; Loss of electric service to more than 50,000 customers for 1 hour or more-Severe Weather 370 173879
2023 2 02/02/2023 8:15 AM 02/02/2023 7:45 PM 11 Hours, 30 Minutes Entergy Corp SERC Arkansas: Mississippi: Texas: Loss of electric service to more than 50,000 customers for 1 hour or more-Severe Weather Unknown 74426
2023 2 02/02/2023 11:00 AM . . . Hours, . Minutes Tenaska Pennsylvania Partners, LLC. RF Pennsylvania: Westmoreland County; Physical threat to its Facility excluding weather or natural disaster related threats, which has the potential to degrade the normal operation of the Facility. Or suspicious device or activity at its Facility.-Suspicious Activity 0 0
2023 2 02/02/2023 2:37 PM 02/02/2023 2:47 PM 0 Hours, 10 Minutes Old Dominion Electric Coop RF Maryland: Cecil County; Physical threat to its Facility excluding weather or natural disaster related threats, which has the potential to degrade the normal operation of the Facility. Or suspicious device or activity at its Facility.-Suspicious Activity 0 0
2023 2 02/06/2023 10:00 AM 02/06/2023 10:02 AM 0 Hours, 2 Minutes Baltimore Gas and Electric RF Maryland: Physical threat to its Facility excluding weather or natural disaster related threats, which has the potential to degrade the normal operation of the Facility. Or suspicious device or activity at its Facility.-Suspicious Activity 0 0
2023 2 02/07/2023 6:15 AM 02/07/2023 6:20 AM 0 Hours, 5 Minutes Exelon Corporation / Commonwealth Edison Company (ComEd) NCR08013 SERC Illinois: DuPage County; Physical threat to its Facility excluding weather or natural disaster related threats, which has the potential to degrade the normal operation of the Facility. Or suspicious device or activity at its Facility.-Suspicious Activity 0 0
2023 2 02/07/2023 8:30 AM . . . Hours, . Minutes Ravenswood Generating Station NPCC New York: Queens County; Physical threat to its Facility excluding weather or natural disaster related threats, which has the potential to degrade the normal operation of the Facility. Or suspicious device or activity at its Facility.-Suspicious Activity 0 0
2023 2 02/08/2023 1:30 PM 02/08/2023 2:00 PM 0 Hours, 30 Minutes Hickory Run Energy, LLC RF Pennsylvania: Lawrence County; Physical threat to its Facility excluding weather or natural disaster related threats, which has the potential to degrade the normal operation of the Facility. Or suspicious device or activity at its Facility.-Suspicious Activity 0 0
2023 2 02/15/2023 2:25 PM 02/15/2023 2:30 PM 0 Hours, 5 Minutes Seminole Electric Cooperative Inc SERC Florida: Clay County; Physical threat to its Facility excluding weather or natural disaster related threats, which has the potential to degrade the normal operation of the Facility. Or suspicious device or activity at its Facility.-Suspicious Activity 0 0
2023 2 02/18/2023 12:00 AM 02/18/2023 12:05 AM 0 Hours, 5 Minutes Oklahoma Municipal Power Authority MRO Oklahoma: Kay County; Physical threat to its Facility excluding weather or natural disaster related threats, which has the potential to degrade the normal operation of the Facility. Or suspicious device or activity at its Facility.-Suspicious Activity 0 0
2023 2 02/21/2023 9:45 AM . . . Hours, . Minutes Brownsville Public Utilities Board TRE Texas: Cameron County; Cyber event that could potentially impact electric power system adequacy or reliability-Cyber Event 0 0
2023 2 02/22/2023 4:00 PM 02/22/2023 4:01 PM 0 Hours, 1 Minutes Otter Tail Power Co MRO South Dakota: Physical threat to its Facility excluding weather or natural disaster related threats, which has the potential to degrade the normal operation of the Facility. Or suspicious device or activity at its Facility.-Suspicious Activity 0 0
2023 2 02/22/2023 6:30 PM . . . Hours, . Minutes Detroit Edison Co RF Michigan: Loss of electric service to more than 50,000 customers for 1 hour or more-Severe Weather 6200 623358
2023 2 02/22/2023 6:41 PM 02/25/2023 4:12 PM 69 Hours, 31 Minutes Consumers Energy Co RF Michigan: Van Buren County, Kalamazoo County, St. Joseph County, Calhoun County, Branch County, Hillsdale County, Jackson County, Washtenaw County, Monroe County, Lenawee County, Ingham County, Barry County, Allegan County, Ottawa County, Eaton County, Ingham County, Shiawassee County, Clinton County; Loss of electric service to more than 50,000 customers for 1 hour or more-Severe Weather Unknown 261043
2023 2 02/23/2023 4:30 AM 02/23/2023 1:00 PM 8 Hours, 30 Minutes WEC Energy Group (WEPCO, WPSC, UMERC, WEP-MIUP) MRO Wisconsin: Kenosha County, Racine County, Milwaukee County, Walworth County, Jefferson County, Waukesha County; Michigan: Loss of electric service to more than 50,000 customers for 1 hour or more-Severe Weather 143 57000
2023 2 02/24/2023 12:29 PM 02/24/2023 12:45 PM 0 Hours, 16 Minutes Seminole Electric Cooperative Inc SERC Florida: Pasco County; Physical threat to its Facility excluding weather or natural disaster related threats, which has the potential to degrade the normal operation of the Facility. Or suspicious device or activity at its Facility.-Suspicious Activity 0 0
2023 2 02/25/2023 12:08 AM 02/26/2023 6:08 PM 42 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 153555
2023 2 02/27/2023 1:25 PM 02/27/2023 11:59 PM 10 Hours, 34 Minutes Consumers Energy Co RF Michigan: Newaygo County, Oceana County, Ionia County, Montcalm County, Jackson County, Van Buren County, Washtenaw County, Hillsdale County, Lenawee County; Loss of electric service to more than 50,000 customers for 1 hour or more-Severe Weather Unknown 76000
2023 3 03/02/2023 7:00 PM 03/04/2023 11:00 PM 52 Hours, 0 Minutes Oncor Electric Delivery Company LLC TRE Texas: Montague County, Cooke County, Grayson County, Fannin County, Lamar County, Young County, Jack County, Wise County, Denton County, Collin County, Hunt County, Delta County, Hopkins County, Stephens County, Palo Pinto County, Parker County, Tarrant County, Dallas County, Rockwall County, Kaufman County, Van Zandt County, Rains County, Eastland County, Erath County, Hood County, Somervell Cou Loss of electric service to more than 50,000 customers for 1 hour or more-Severe Weather Unknown 470000
2023 3 03/03/2023 12:45 PM 03/03/2023 10:42 PM 9 Hours, 57 Minutes Southern Company SERC Alabama: Georgia: Mississippi: Loss of electric service to more than 50,000 customers for 1 hour or more-Severe Weather 346 48384
2023 3 03/03/2023 1:45 PM 03/03/2023 1:50 PM 0 Hours, 5 Minutes Exelon Corporation / Commonwealth Edison Company (ComEd) NCR08013 SERC/RF Illinois: Cook County; Physical threat to its Facility excluding weather or natural disaster related threats, which has the potential to degrade the normal operation of the Facility. Or suspicious device or activity at its Facility.-Suspicious Activity 0 0
2023 3 03/03/2023 2:00 PM 03/04/2023 4:00 AM 14 Hours, 0 Minutes Nashville Electric Service SERC Tennessee: Davidson County; Loss of electric service to more than 50,000 customers for 1 hour or more-Severe Weather Unknown 115000
2023 3 03/03/2023 3:40 PM . . . Hours, . Minutes LG&E KU Energy LLC SERC Kentucky: Oldham County, Jefferson County, Fayette County, Franklin County, Hardin County, Hart County, Hopkins County, Jessamine County, Muhlenberg County, Nelson County, Scott County, Shelby County, Spencer County, Washington County, Woodford County, Bullitt County, Meade County, Lyon County, LaRue County, Henry County, Grayson County, Boyle County, Christian County, Anderson County; Virginia: W Loss of electric service to more than 50,000 customers for 1 hour or more-Severe Weather Unknown 346000
2023 3 03/03/2023 3:40 PM . . . Hours, . Minutes Louisville Gas & Electric Co SERC Kentucky: Oldham County, Jefferson County, Fayette County, Franklin County, Hardin County, Hart County, Hopkins County, Jessamine County, Muhlenberg County, Nelson County, Scott County, Shelby County, Spencer County, Washington County, Woodford County, Bullitt County, Meade County, Lyon County, LaRue County, Henry County, Grayson County, Boyle County, Christian County, Anderson County; Virginia: W Loss of electric service to more than 50,000 customers for 1 hour or more-Severe Weather Unknown Unknown
2023 3 03/03/2023 5:50 PM 03/05/2023 12:01 PM 42 Hours, 11 Minutes Detroit Edison Co RF Michigan: Loss of electric service to more than 50,000 customers for 1 hour or more-Severe Weather 0 200000
2023 3 03/03/2023 7:28 PM 03/03/2023 8:54 PM 1 Hours, 26 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 57186
2023 3 03/04/2023 7:05 AM 03/04/2023 7:06 AM 0 Hours, 1 Minutes Entergy - Transmission Operations Engineering SERC Louisiana: Uncontrolled loss of 300 Megawatts or more of firm system loads for 15 minutes or more from a single incident-Transmission Interruption 800 Unknown
2023 3 03/04/2023 7:05 AM 03/04/2023 7:06 AM 0 Hours, 1 Minutes Entergy - Power Delivery SERC Louisiana: Uncontrolled loss of 300 Megawatts or more of firm system loads for 15 minutes or more from a single incident-Transmission Interruption 965 33
2023 3 03/05/2023 8:03 PM 03/06/2023 3:38 PM 19 Hours, 35 Minutes Southern Company SERC Georgia: Fulton County; Physical threat to its Facility excluding weather or natural disaster related threats, which has the potential to degrade the normal operation of the Facility. Or suspicious device or activity at its Facility.-Suspicious Activity 0 0
2023 3 03/07/2023 10:26 AM 03/07/2023 2:42 PM 4 Hours, 16 Minutes Lubbock Power and Light TRE Texas: Lubbock County; Physical threat to its Facility excluding weather or natural disaster related threats, which has the potential to degrade the normal operation of the Facility. Or suspicious device or activity at its Facility.-Vandalism 0 0
2023 3 03/07/2023 11:00 AM 03/07/2023 3:45 PM 4 Hours, 45 Minutes Southwestern Public Service TRE Texas: Lubbock County; New Mexico: Physical threat to its Facility excluding weather or natural disaster related threats, which has the potential to degrade the normal operation of the Facility. Or suspicious device or activity at its Facility.-Vandalism 0 0
2023 3 03/09/2023 6:00 PM 03/10/2023 6:00 PM 24 Hours, 0 Minutes WEC Energy Group (WEPCO, WPSC, UMERC, WEP-MIUP) MRO/RF Wisconsin: Walworth County, Waukesha County, Milwaukee County, Racine County, Ozaukee County, Kenosha County; Loss of electric service to more than 50,000 customers for 1 hour or more-Severe Weather 250 100000
2023 3 03/14/2023 8:00 AM 03/16/2023 8:20 AM 48 Hours, 20 Minutes ISO New England NPCC Connecticut: Massachusetts: Vermont: Rhode Island: New Hampshire: Maine: Loss of electric service to more than 50,000 customers for 1 hour or more-Severe Weather Unknown 83000
2023 3 03/14/2023 9:25 AM 03/15/2023 3:00 PM 29 Hours, 35 Minutes National Grid NPCC New York: Loss of electric service to more than 50,000 customers for 1 hour or more-Severe Weather Unknown Unknown
2023 3 03/16/2023 10:34 AM 03/16/2023 2:26 PM 3 Hours, 52 Minutes Lubbock Power and Light TRE Texas: Lubbock County; Physical threat to its Facility excluding weather or natural disaster related threats, which has the potential to degrade the normal operation of the Facility. Or suspicious device or activity at its Facility.-Suspicious Activity 0 0
2023 3 03/22/2023 5:45 AM 03/22/2023 5:46 AM 0 Hours, 1 Minutes Hill Top Energy Center RF Pennsylvania: Greene County; Physical threat to its Facility excluding weather or natural disaster related threats, which has the potential to degrade the normal operation of the Facility. Or suspicious device or activity at its Facility.-Suspicious Activity 621 0
2023 3 03/25/2023 4:12 PM . . . Hours, . Minutes American Electric Power - (RFC Reliability Region) (8400 Smiths Mill Road, New Albany Ohio 43054) RF Ohio: West Virginia: Virginia: Loss of electric service to more than 50,000 customers for 1 hour or more-Severe Weather Unknown 160801
2023 3 03/25/2023 4:13 PM 03/27/2023 6:30 PM 50 Hours, 17 Minutes Detroit Edison Co RF Michigan: Loss of electric service to more than 50,000 customers for 1 hour or more-Severe Weather 5800 67893
2023 3 03/26/2023 12:52 PM 03/26/2023 1:54 PM 1 Hours, 2 Minutes Pacificorp WECC Washington: Oregon: Josephine County; California: Idaho: Utah: Wyoming: Montana: Physical threat to its Facility excluding weather or natural disaster related threats, which has the potential to degrade the normal operation of the Facility. Or suspicious device or activity at its Facility.-Vandalism 34 Unknown
2023 3 03/28/2023 6:03 PM 03/28/2023 8:08 PM 2 Hours, 5 Minutes Brownsville Public Utilities Board TRE Texas: Cameron County; Physical threat to its Facility excluding weather or natural disaster related threats, which has the potential to degrade the normal operation of the Facility. Or suspicious device or activity at its Facility.-Suspicious Activity 0 0
2023 3 03/30/2023 6:28 PM 03/30/2023 10:13 PM 3 Hours, 45 Minutes Western Area Power Administration (WAPA) - Rocky Mountain Region WECC Colorado: Larimer 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 18 Unknown
2023 3 03/30/2023 7:21 PM . . . Hours, . Minutes Western Area Power Administration - Rocky Mountain Region WECC Colorado: Larimer 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 Unknown Unknown
2023 3 03/31/2023 6:00 PM 03/31/2023 8:45 PM 2 Hours, 45 Minutes Entergy Corp SERC Arkansas: Loss of electric service to more than 50,000 customers for 1 hour or more-Severe Weather Unknown 58368
2023 3 03/31/2023 8:49 PM . . . Hours, . Minutes ComEd SERC / RF Illinois: Loss of electric service to more than 50,000 customers for 1 hour or more-Severe Weather Unknown 65000
2023 3 03/31/2023 11:00 PM 04/01/2023 4:15 PM 17 Hours, 15 Minutes Northern States Power Co MRO Minnesota: Ramsey County, Hennepin County, Dakota County, Washington County; Loss of electric service to more than 50,000 customers for 1 hour or more-Severe Weather Unknown 80000
2023 4 04/01/2023 2:00 PM 04/03/2023 10:47 AM 44 Hours, 47 Minutes American Electric Power - (RFC Reliability Region) (8400 Smiths Mill Road, New Albany Ohio 43054) RF/SERC Ohio: West Virginia: Virginia: Loss of electric service to more than 50,000 customers for 1 hour or more-Severe Weather Unknown 118000
2023 4 04/03/2023 12:06 PM 04/03/2023 12:54 PM 0 Hours, 48 Minutes Southern Company SERC Alabama: Walker County; Physical threat to its Facility excluding weather or natural disaster related threats, which has the potential to degrade the normal operation of the Facility. Or suspicious device or activity at its Facility.-Actual Physical Attack/Vandalism 0 0
2023 4 04/08/2023 4:30 AM 04/08/2023 5:05 AM 0 Hours, 35 Minutes Brownsville Public Utilities Board TRE Texas: Cameron County; Physical threat to its Facility excluding weather or natural disaster related threats, which has the potential to degrade the normal operation of the Facility. Or suspicious device or activity at its Facility.-Suspicious Activity 0 0
2023 4 04/14/2023 5:30 AM . . . Hours, . Minutes FL Solar 5, LLC SERC Florida: Orange County;  Cyber event that could potentially impact electric power system adequacy or reliability-Cyber Event 0 0
2023 4 04/19/2023 11:13 PM 04/20/2023 5:24 PM 18 Hours, 11 Minutes American Electric Power - Texas TRE Texas: Calhoun 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 Unknown Unknown
2023 4 04/27/2023 11:00 AM 04/27/2023 11:14 AM 0 Hours, 14 Minutes Pedernales Electric Cooperative, Inc. TRE Texas: Blanco County; Physical threat to its Facility excluding weather or natural disaster related threats, which has the potential to degrade the normal operation of the Facility. Or suspicious device or activity at its Facility.-Vandalism 0 0
2023 4 04/29/2023 12:00 AM 04/29/2023 8:00 PM 20 Hours, 0 Minutes American Electric Power - Texas TRE Texas: Hidalgo County, Cameron County, Willacy County, Starr County; Loss of electric service to more than 50,000 customers for 1 hour or more-Severe Weather Unknown 168419
2023 5 05/01/2023 5:16 AM 05/01/2023 9:31 AM 4 Hours, 15 Minutes ISO New England NPCC Connecticut: Massachusetts: Rhode Island: Maine: New Hampshire: Vermont: Loss of electric service to more than 50,000 customers for 1 hour or more-Severe Weather Unknown 54000
2023 5 05/12/2023 11:43 AM 05/12/2023 12:00 PM 0 Hours, 17 Minutes New York State Electric & Gas NPCC New York: Broome County; Physical threat to its Bulk Electric System control center, excluding weather or natural disaster related threats, which has the potential to degrade the normal operation of the control center. Or suspicious device or activity at its Bulk Electric System control center.-Suspicious Activity 0 0
2023 5 05/21/2023 3:30 PM 05/21/2023 3:40 PM 0 Hours, 10 Minutes Puget Sound Energy WECC Washington: Whatcom County; Physical threat to its Facility excluding weather or natural disaster related threats, which has the potential to degrade the normal operation of the Facility. Or suspicious device or activity at its Facility.-Suspicious Activity 0 0
2023 5 05/24/2023 9:16 AM . . . Hours, . Minutes ITC Holdings MRO Iowa: Minnesota: Complete operational failure or shut down of the transmission and/or distribution electrical system-System Operations 2200 Unknown
2023 5 05/30/2023 8:00 AM 05/30/2023 8:01 AM 0 Hours, 1 Minutes ISO New England NPCC Massachusetts: Hampden County[13]; Physical threat to its Bulk Electric System control center, excluding weather or natural disaster related threats, which has the potential to degrade the normal operation of the control center. Or suspicious device or activity at its Bulk Electric System control center.-Actual Physical Attack/Vandalism 0 0
2023 6 06/25/2023 4:00 AM . . . Hours, . Minutes WEC Energy Group (WEPCO, WPSC, UMERC, WEP-MIUP) MRO/RF Wisconsin, Michigan Loss of electric service to more than 50,000 customers for 1 hour or more-- Weather or natural disaster 175 70000
2023 6 06/25/2023 6:45 AM . . . Hours, . Minutes Memphis Light Gas and Water Division SERC Tennessee Loss of electric service to more than 50,000 customers for 1 hour or more-- Weather or natural disaster Unknown 120000
2023 6 06/25/2023 5:30 PM 06/26/2023 3:31 PM 22 Hours, 1 Minutes Southern Company SERC Georgia, Alabama Loss of electric service to more than 50,000 customers for 1 hour or more-- Weather or natural disaster Unknown Unknown
2023 6 06/25/2023 7:00 PM . . . Hours, . Minutes Detroit Edison Co RF Michigan Loss of electric service to more than 50,000 customers for 1 hour or more.-- Weather or natural disaster Unknown Unknown
2023 6 06/25/2023 7:30 PM 06/26/2023 5:45 PM 22 Hours, 15 Minutes Entergy Corp SERC Arkansas, Mississippi Loss of electric service to more than 50,000 customers for 1 hour or more-- Weather or natural disaster Unknown 64732
2023 6 06/29/2023 3:42 PM . . . Hours, . Minutes Duke Energy Midwest RF Indiana Loss of electric service to more than 50,000 customers for 1 hour or more.-- Weather or natural disaster Unknown 140000
2023 7 07/06/2023 1:38 PM 07/06/2023 3:04 PM 1 Hours, 26 Minutes Omaha Public Power District MRO Nebraska: Sarpy County; Physical threat to its Facility excluding weather or natural disaster related threats, which has the potential to degrade the normal operation of the Facility. Or suspicious device or activity at its Facility.-- Suspicious activity 0 0
2023 7 07/14/2023 3:00 PM . . . Hours, . Minutes Evergy SERC Missouri: Kansas: Loss of electric service to more than 50,000 customers for 1 hour or more.-- Weather or natural disaster Unknown 163156
2023 7 07/18/2023 1:30 PM 07/18/2023 2:30 PM 1 Hours, 0 Minutes Wabash Valley Power SERC Missouri: Physical threat to its Facility excluding weather or natural disaster related threats, which has the potential to degrade the normal operation of the Facility. Or suspicious device or activity at its Facility.-- Suspicious activity 0 0
2023 7 07/18/2023 5:50 PM 07/25/2023 2:00 PM 164 Hours, 10 Minutes Memphis Light Gas and Water Division SERC Tennessee: Shelby County; Uncontrolled loss of 300 Megawatts or more of firm system loads for 15 minutes or more from a single incident.-- Weather or natural disaster 1200 216000
2023 7 07/20/2023 3:30 PM 07/21/2023 12:00 PM 20 Hours, 30 Minutes DTE Energy RF Michigan: Loss of electric service to more than 50,000 customers for 1 hour or more.-- Weather or natural disaster Unknown 90354
2023 7 07/20/2023 4:30 PM 07/22/2023 12:17 PM 43 Hours, 47 Minutes Southern Company SERC Georgia: Loss of electric service to more than 50,000 customers for 1 hour or more.-- Weather or natural disaster 640 35257
2023 7 07/25/2023 6:52 PM 07/25/2023 7:00 PM 0 Hours, 8 Minutes Memphis Light Gas and Water Division SERC Tennessee: Shelby County; Uncontrolled loss of 300 Megawatts or more of firm system loads for 15 minutes or more from a single incident.-- Unknown - Failure at high voltage substation or switchyard 820 Unknown
2023 7 07/26/2023 2:51 PM 07/26/2023 5:23 PM 2 Hours, 32 Minutes Detroit Edison Co RF Michigan: Oakland County, Wayne County, Macomb County, Washtenaw County, Livingston County; Loss of electric service to more than 50,000 customers for 1 hour or more.-- Weather or natural disaster Unknown 246000
2023 7 07/28/2023 12:16 PM 07/28/2023 12:17 PM 0 Hours, 1 Minutes Seattle City Light WECC Washington: King County; Physical attack that could potentially impact electric power system adequacy or reliability; or vandalism which targets components of any security systems.-- Physical attack - Vandalism - Other 0 0
2023 7 07/28/2023 6:00 PM 07/30/2023 7:45 AM 37 Hours, 45 Minutes American Electric Power - (RFC Reliability Region) (8400 Smiths Mill Road, New Albany Ohio 43054) RF West Virginia: Virginia: Loss of electric service to more than 50,000 customers for 1 hour or more.-- Weather or natural disaster Unknown 52098
2023 7 07/28/2023 9:00 PM . . . Hours, . Minutes Exelon Corporation/BGE RF Maryland: Harford County; Loss of electric service to more than 50,000 customers for 1 hour or more.-- Weather or natural disaster Unknown 61000
2023 7 07/28/2023 9:00 PM 07/30/2023 10:00 AM 37 Hours, 0 Minutes ComEd MRO/RF Illinois: Winnebago County, Cook County, Will County, DeKalb County, Kendall County; Loss of electric service to more than 50,000 customers for 1 hour or more.-- Weather or natural disaster Unknown 122921
2023 7 07/28/2023 10:58 PM . . . Hours, . Minutes WEC Energy Group (WEPCO, WPSC, UMERC, WEP-MIUP) MRO/RF Wisconsin: Jefferson County, Waukesha County, Milwaukee County, Sheboygan County, Washington County, Ozaukee County, Walworth County, Kenosha County, Racine County; Michigan: Loss of electric service to more than 50,000 customers for 1 hour or more.-- Weather or natural disaster 213 85000
2023 7 07/29/2023 4:00 PM 07/29/2023 4:01 PM 0 Hours, 1 Minutes FirstLight Power NPCC Massachusetts: Franklin County[13]; Physical threat to its Facility excluding weather or natural disaster related threats, which has the potential to degrade the normal operation of the Facility. Or suspicious device or activity at its Facility. Physical threat to its Bulk Electric System control center, excluding weather or natural disaster related threats, which has the potential to degrade the normal operation of the control cent 0 0
2023 7 07/29/2023 4:00 PM 08/01/2023 7:00 AM 63 Hours, 0 Minutes Baltimore Gas and Electric RF Maryland: Loss of electric service to more than 50,000 customers for 1 hour or more.-- Weather or natural disaster Unknown 53630
2023 7 07/29/2023 4:25 PM 07/29/2023 4:28 PM 0 Hours, 3 Minutes Potomac Electric Power Company RF Maryland: Montgomery County; Loss of electric service to more than 50,000 customers for 1 hour or more.-- Weather or natural disaster Unknown 54158
2023 7 07/30/2023 8:30 PM . . . Hours, . Minutes Evergy SERC,MRO Missouri: Kansas: Loss of electric service to more than 50,000 customers for 1 hour or more.-- Weather or natural disaster Unknown 72173
2023 8 . . . . . Hours, . Minutes WEC Energy Group (WEPCO, WPSC, UMERC, WEP-MIUP) MRO/RF Wisconsin: Jefferson County, Waukesha County, Milwaukee County, Sheboygan County, Washington County, Ozaukee County, Walworth County, Kenosha County, Racine County; Michigan: Loss of electric service to more than 50,000 customers for 1 hour or more.-- Weather or natural disaster 213 85000
2023 8 . . . . . Hours, . Minutes Evergy SERC Missouri: Kansas: Loss of electric service to more than 50,000 customers for 1 hour or more.-- Weather or natural disaster Unknown 163156
2023 8 . . . . . Hours, . Minutes Evergy SERC,MRO Missouri: Kansas: Loss of electric service to more than 50,000 customers for 1 hour or more.-- Weather or natural disaster Unknown 72173
2023 8 . . . . . Hours, . Minutes Exelon Corporation/BGE RF Maryland: Harford County; Loss of electric service to more than 50,000 customers for 1 hour or more.-- Weather or natural disaster Unknown 61000
2023 8 . . 07/06/2023 3:04 PM . Hours, . Minutes Omaha Public Power District MRO Nebraska: Sarpy County; Physical threat to its Facility excluding weather or natural disaster related threats, which has the potential to degrade the normal operation of the Facility. Or suspicious device or activity at its Facility.-- Suspicious activity 0 0
2023 8 . . 07/18/2023 2:30 PM . Hours, . Minutes Wabash Valley Power SERC Missouri: Physical threat to its Facility excluding weather or natural disaster related threats, which has the potential to degrade the normal operation of the Facility. Or suspicious device or activity at its Facility.-- Suspicious activity 0 0
2023 8 . . 07/21/2023 12:00 PM . Hours, . Minutes DTE Energy RF Michigan: Loss of electric service to more than 50,000 customers for 1 hour or more.-- Weather or natural disaster Unknown 90354
2023 8 . . 07/22/2023 12:17 PM . Hours, . Minutes Southern Company SERC Georgia: Loss of electric service to more than 50,000 customers for 1 hour or more.-- Weather or natural disaster 640 35257
2023 8 . . 07/25/2023 2:00 PM . Hours, . Minutes Memphis Light Gas and Water Division SERC Tennessee: Shelby County; Uncontrolled loss of 300 Megawatts or more of firm system loads for 15 minutes or more from a single incident.-- Weather or natural disaster 1200 216000
2023 8 . . 07/25/2023 7:00 PM . Hours, . Minutes Memphis Light Gas and Water Division SERC Tennessee: Shelby County; Uncontrolled loss of 300 Megawatts or more of firm system loads for 15 minutes or more from a single incident.-- Unknown - Failure at high voltage substation or switchyard 820 Unknown
2023 8 . . 07/26/2023 5:23 PM . Hours, . Minutes Detroit Edison Co RF Michigan: Oakland County, Wayne County, Macomb County, Washtenaw County, Livingston County; Loss of electric service to more than 50,000 customers for 1 hour or more.-- Weather or natural disaster Unknown 246000
2023 8 . . 07/28/2023 12:17 PM . Hours, . Minutes Seattle City Light WECC Washington: King County; Physical attack that could potentially impact electric power system adequacy or reliability; or vandalism which targets components of any security systems.-- Physical attack - Vandalism - Other 0 0
2023 8 . . 07/29/2023 4:01 PM . Hours, . Minutes FirstLight Power NPCC Massachusetts: Franklin County[13]; Physical threat to its Facility excluding weather or natural disaster related threats, which has the potential to degrade the normal operation of the Facility. Or suspicious device or activity at its Facility. Physical threat to its Bulk Electric System control center, excluding weather or natural disaster related threats, which has the potential to degrade the normal operation of the control cent 0 0
2023 8 . . 07/29/2023 4:28 PM . Hours, . Minutes Potomac Electric Power Company RF Maryland: Montgomery County; Loss of electric service to more than 50,000 customers for 1 hour or more.-- Weather or natural disaster Unknown 54158
2023 8 . . 07/30/2023 7:45 AM . Hours, . Minutes American Electric Power - (RFC Reliability Region) (8400 Smiths Mill Road, New Albany Ohio 43054) RF West Virginia: Virginia: Loss of electric service to more than 50,000 customers for 1 hour or more.-- Weather or natural disaster Unknown 52098
2023 8 . . 07/30/2023 10:00 AM . Hours, . Minutes ComEd MRO/RF Illinois: Winnebago County, Cook County, Will County, DeKalb County, Kendall County; Loss of electric service to more than 50,000 customers for 1 hour or more.-- Weather or natural disaster Unknown 122921
2023 8 . . 08/01/2023 7:00 AM . Hours, . Minutes Baltimore Gas and Electric RF Maryland: Loss of electric service to more than 50,000 customers for 1 hour or more.-- Weather or natural disaster Unknown 53630
2023 9 09/07/2023 1:00 PM 09/07/2023 1:15 PM 0 Hours, 15 Minutes Lower Colorado River Authority TRE Texas: Fayette County; Physical threat to its Facility excluding weather or natural disaster related threats, which has the potential to degrade the normal operation of the Facility. Or suspicious device or activity at its Facility.-- Suspicious activity 0 0
2023 9 09/08/2023 3:15 PM 09/09/2023 10:05 PM 30 Hours, 50 Minutes ISO New England NPCC Connecticut: Massachusetts: Maine: Rhode Island: Vermont: New Hampshire: Loss of electric service to more than 50,000 customers for 1 hour or more-- Weather or natural disaster Unknown 114000
2023 9 09/08/2023 11:44 PM 09/10/2023 7:00 PM 43 Hours, 16 Minutes Oncor Electric Delivery Company LLC TRE Texas: Tarrant County, Dallas County; Loss of electric service to more than 50,000 customers for 1 hour or more-- Weather or natural disaster Unknown 190000
2023 9 09/09/2023 10:31 AM 09/09/2023 10:51 AM 0 Hours, 20 Minutes Ravenswood Generating Station NPCC New York: Queens County; Physical threat to its Facility excluding weather or natural disaster related threats, which has the potential to degrade the normal operation of the Facility. Or suspicious device or activity at its Facility.-- Suspicious activity 0 0
2023 9 09/16/2023 10:35 AM 09/17/2023 1:00 AM 14 Hours, 25 Minutes ISO New England NPCC Connecticut: Massachusetts: Maine: Rhode Island: Vermont: New Hampshire: Loss of electric service to more than 50,000 customers for 1 hour or more-- Weather or natural disaster Unknown 75000
2023 9 09/18/2023 8:53 AM 09/18/2023 10:26 AM 1 Hours, 33 Minutes Brownsville Public Utilities Board TRE Texas: Cameron County; Physical threat to its Facility excluding weather or natural disaster related threats, which has the potential to degrade the normal operation of the Facility. Or suspicious device or activity at its Facility.-- Suspicious activity 0 0
2023 9 09/24/2023 11:44 PM 09/26/2023 8:45 PM 45 Hours, 1 Minutes Oncor Electric Delivery Company LLC TRE Texas: Dallas County, Tarrant County, McLennan County, Angelina County, Bell County, Williamson County, Smith County; Loss of electric service to more than 50,000 customers for 1 hour or more-- Weather or natural disaster Unknown 130000
2023 9 09/29/2023 10:16 PM 09/29/2023 10:18 PM 0 Hours, 2 Minutes Pacific Gas & Electric Co WECC California: Butte 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-- Weather or natural disaster 18 9082
2023 10 10/03/2023 4:00 PM 10/03/2023 6:50 PM 2 Hours, 50 Minutes Duke Energy Carolinas SERC North Carolina: South Carolina: Physical threat to its Facility excluding weather or natural disaster related threats, which has the potential to degrade the normal operation of the Facility. Or suspicious device or activity at its Facility.-- Suspicious activity Unknown Unknown
2023 10 10/03/2023 11:44 PM 10/04/2023 12:21 AM 0 Hours, 37 Minutes PPL Electric Utilities Corp RF Pennsylvania: Complete loss of monitoring or control capability at its staffed Bulk Electric System control center for 30 continuous minutes or more.-- Unknown 0 0
2023 10 10/04/2023 10:01 PM 10/06/2023 4:15 AM 30 Hours, 14 Minutes Oncor Electric Delivery Company LLC RE Texas: Loss of electric service to more than 50,000 customers for 1 hour or more-- Weather or natural disaster Unknown 153000
2023 10 10/06/2023 2:42 AM 10/06/2023 3:13 AM 0 Hours, 31 Minutes Brownsville Public Utilities Board RE Texas: Cameron County; Physical threat to its Facility excluding weather or natural disaster related threats, which has the potential to degrade the normal operation of the Facility. Or suspicious device or activity at its Facility.-- Suspicious activity 0 0
2023 10 10/12/2023 2:37 PM 10/12/2023 3:37 PM 1 Hours, 0 Minutes Armstrong Power, LLC RF Pennsylvania: Armstrong County; Physical threat to its Facility excluding weather or natural disaster related threats, which has the potential to degrade the normal operation of the Facility. Or suspicious device or activity at its Facility.-- Suspicious activity Unknown Unknown
2023 10 10/12/2023 2:37 PM 10/12/2023 3:37 PM 1 Hours, 0 Minutes Armstrong Power, LLC RF Pennsylvania: Armstrong County; Physical threat to its Facility excluding weather or natural disaster related threats, which has the potential to degrade the normal operation of the Facility. Or suspicious device or activity at its Facility.-- Suspicious activity Unknown Unknown
2023 10 10/19/2023 9:40 AM 10/19/2023 9:45 AM 0 Hours, 5 Minutes Hill Top Energy Center RF Pennsylvania: Greene County; Physical threat to its Facility excluding weather or natural disaster related threats, which has the potential to degrade the normal operation of the Facility. Or suspicious device or activity at its Facility.-- Suspicious activity 0 0
2023 10 10/26/2023 10:05 AM 10/26/2023 10:20 AM 0 Hours, 15 Minutes Exelon Corporation / Commonwealth Edison Company (ComEd) NCR08013 WECC Illinois: Cook County; Physical threat to its Facility excluding weather or natural disaster related threats, which has the potential to degrade the normal operation of the Facility. Or suspicious device or activity at its Facility.-- Suspicious activity 0 0
2023 10 10/26/2023 10:05 AM 10/26/2023 10:20 AM 0 Hours, 15 Minutes Exelon Corporation / Commonwealth Edison Company (ComEd) NCR08013 RE Illinois: Cook County; Physical threat to its Facility excluding weather or natural disaster related threats, which has the potential to degrade the normal operation of the Facility. Or suspicious device or activity at its Facility.-- Suspicious activity 0 0
2023 10 10/29/2023 4:00 AM 10/30/2023 4:00 PM 36 Hours, 0 Minutes Apex Generating Station WECC Nevada: Physical threat to its Facility excluding weather or natural disaster related threats, which has the potential to degrade the normal operation of the Facility. Or suspicious device or activity at its Facility.-- Suspicious activity 0 0
2023 11 11/02/2023 8:00 PM 11/02/2023 8:06 PM 0 Hours, 6 Minutes Duke Energy Carolinas SERC South Carolina: Oconee County; Physical threat to its Facility excluding weather or natural disaster related threats, which has the potential to degrade the normal operation of the Facility. Or suspicious device or activity at its Facility.-- Suspicious activity 0 0
2023 11 11/10/2023 8:00 AM 11/10/2023 8:01 AM 0 Hours, 1 Minutes Apex Generating Station WECC Nevada: Physical threat to its Facility excluding weather or natural disaster related threats, which has the potential to degrade the normal operation of the Facility. Or suspicious device or activity at its Facility.-- Vandalism - Theft - Suspicious activity 0 0
2023 11 11/10/2023 6:10 PM 11/10/2023 7:58 PM 1 Hours, 48 Minutes Constellation Energy Generation, LLC RF Pennsylvania: Montgomery County; Physical threat to its Facility excluding weather or natural disaster related threats, which has the potential to degrade the normal operation of the Facility. Or suspicious device or activity at its Facility.-- Suspicious activity 0 0
2023 11 11/16/2023 3:18 AM . . . Hours, . Minutes Florida Power & Light SERC Florida: Miami-Dade County, Broward County; Loss of electric service to more than 50,000 customers for 1 hour or more-- Weather or natural disaster 0 0
2023 11 11/17/2023 1:43 AM 11/17/2023 3:33 AM 1 Hours, 50 Minutes Pacific Gas & Electric Co WECC California: Contra Costa County; Physical threat to its Facility excluding weather or natural disaster related threats, which has the potential to degrade the normal operation of the Facility. Or suspicious device or activity at its Facility.-- Other 0 0
2023 11 11/19/2023 3:00 AM 11/19/2023 3:30 AM 0 Hours, 30 Minutes Eagle Point Power Generation LLC RF New Jersey: Gloucester County; Physical threat to its Facility excluding weather or natural disaster related threats, which has the potential to degrade the normal operation of the Facility. Or suspicious device or activity at its Facility.-- Theft 0 0
2023 11 11/19/2023 2:00 PM 11/19/2023 2:10 PM 0 Hours, 10 Minutes CPV Three Rivers, LLC SERC Illinois: Grundy County; Physical threat to its Facility excluding weather or natural disaster related threats, which has the potential to degrade the normal operation of the Facility. Or suspicious device or activity at its Facility.-- Suspicious activity 0 0
2023 11 11/20/2023 12:00 AM 11/20/2023 2:00 AM 2 Hours, 0 Minutes Apex Generating Station WECC Nevada: Physical threat to its Facility excluding weather or natural disaster related threats, which has the potential to degrade the normal operation of the Facility. Or suspicious device or activity at its Facility.-- Theft - Suspicious activity 0 0
2023 11 11/25/2023 10:20 AM . . . Hours, . Minutes California Independent System Operator (CAISO) BA reporting on behalf of New-Indy Ontario, LLC. WECC California: San Bernardino County; - 3. Non-reportable Cyber Security-- Unknown 0 0
2023 11 11/27/2023 6:00 AM 11/27/2023 1:00 PM 7 Hours, 0 Minutes ISO New England NPCC Connecticut: Massachusetts: Maine: Rhode Island: Vermont: New Hampshire: Loss of electric service to more than 50,000 customers for 1 hour or more-- Weather or natural disaster 0 0
2023 12 12/05/2023 11:11 PM 12/06/2023 12:12 AM 1 Hours, 1 Minutes GenOn Energy – New Castle Power LLC RF Pennsylvania: Lawrence County; Physical threat to its Facility excluding weather or natural disaster related threats, which has the potential to degrade the normal operation of the Facility. Or suspicious device or activity at its Facility.-- Vandalism - Theft - Suspicious activity 0 0
2023 12 12/09/2023 11:08 AM 12/09/2023 11:12 AM 0 Hours, 4 Minutes WEC Energy Group (WEPCO, WPSC, UMERC, WEP-MIUP) MRO Wisconsin: Milwaukee County; Michigan: Physical threat to its Facility excluding weather or natural disaster related threats, which has the potential to degrade the normal operation of the Facility. Or suspicious device or activity at its Facility.-- Other 0 0
2023 12 12/11/2023 12:00 AM 12/11/2023 12:00 PM 12 Hours, 0 Minutes Apex Generating Station WECC Nevada: Physical threat to its Bulk Electric System control center, excluding weather or natural disaster related threats, which has the potential to degrade the normal operation of the control center. Or suspicious device or activity at its Bulk Electric System control center.-- Theft - Suspicious activity 0 0
2023 12 12/15/2023 12:46 PM 12/15/2023 4:00 PM 3 Hours, 14 Minutes Consumers Energy Co RF Michigan: Iosco County; Firm load shedding of 100 Megawatts or more implemented under emergency operational policy-- Other 126197 126197
2023 12 12/16/2023 2:05 AM 12/16/2023 2:29 AM 0 Hours, 24 Minutes LUMA Energy SERC Puerto Rico: Physical attack that could potentially impact electric power system adequacy or reliability; or vandalism which targets components of any security systems-- Vandalism - Theft Unknown Unknown
2023 12 12/17/2023 10:46 AM 12/17/2023 10:57 AM 0 Hours, 11 Minutes LUMA Energy SERC Puerto Rico: Uncontrolled loss of 300 Megawatts or more of firm system loads for 15 minutes or more from a single incident-- Vandalism - Theft Unknown Unknown
2023 12 12/18/2023 10:55 AM 12/18/2023 11:41 AM 0 Hours, 46 Minutes First Energy Solutions Corp. RF Ohio: Lucas County; Firm load shedding of 100 Megawatts or more implemented under emergency operational policy-- Vandalism - Theft Unknown Unknown
2023 12 12/18/2023 1:11 PM 12/18/2023 1:23 PM 0 Hours, 12 Minutes LUMA Energy SERC Puerto Rico: Loss of electric service to more than 50,000 customers for 1 hour or more-- Vandalism - Suspicious activity 730000 730000
2023 12 12/19/2023 12:41 AM 12/19/2023 12:47 AM 0 Hours, 6 Minutes LUMA Energy SERC Puerto Rico: Firm load shedding of 100 Megawatts or more implemented under emergency operational policy-- Vandalism - Suspicious activity 50204 50204
2023 12 12/23/2023 12:43 AM 12/23/2023 12:48 AM 0 Hours, 5 Minutes LUMA Energy SERC Puerto Rico: Complete loss of monitoring or control capability at its staffed Bulk Electric System control center for 30 continuous minutes or more.-- Vandalism 0 0
2023 12 12/24/2023 2:07 AM 12/24/2023 1:39 PM 11 Hours, 32 Minutes Seminole Electric Cooperative Inc SERC Florida: Citrus County; System-wide voltage reductions of 3 percent or more-- Vandalism Unknown Unknown
2023 12 12/25/2023 8:35 AM 12/25/2023 3:00 PM 6 Hours, 25 Minutes Consolidated Edison of New York, Inc. NPCC New York: Firm load shedding of 100 Megawatts or more implemented under emergency operational policy-- Vandalism 36100 36100
2023 12 12/27/2023 11:11 AM 12/27/2023 11:12 AM 0 Hours, 1 Minutes Pacificorp WECC Utah: California: Oregon: Harney 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-- Other 8000 8000
2023 12 12/27/2023 2:44 PM 12/28/2023 4:14 AM 13 Hours, 30 Minutes Otter Tail Power Co MRO North Dakota: Stutsman County; Firm load shedding of 100 Megawatts or more implemented under emergency operational policy-- Vandalism Unknown Unknown
2023 12 12/30/2023 5:00 AM 12/30/2023 6:48 AM 1 Hours, 48 Minutes Lower Colorado River Authority RE Texas: Fayette County; Physical threat to its Facility excluding weather or natural disaster related threats, which has the potential to degrade the normal operation of the Facility. Or suspicious device or activity at its Facility.-- Generator loss or failure Unknown Unknown

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