Data report · EIA 2025

Most and Least Reliable Electric Utilities in the U.S. (2025)

Data: U.S. Energy Information Administration, Form EIA-861 & Electric Power Annual. 51 jurisdictions ranked. Methodology on our data page.

Among 98 large U.S. utility service areas (250,000+ customers, IEEE reporting), Nashville Electric Service (TN) had the least outage time in 2025 at 0 min per customer. Monongahela Power Co (WV) had the most at 20 hr 50 min. Figures are each utility's SAIDI including major events, from Form EIA-861.

Most reliable large utilities (2025)

Utility	State	Customers	Outage time / customer	Outages / customer
Nashville Electric Service	TN	461,654	0 min	0.00
City of Colorado Springs - (CO)	CO	261,349	41 min	0.68
Tucson Electric Power Co	AZ	460,504	42 min	0.65
Florida Power & Light Co	FL	6,071,776	47 min	0.46
Denton County Elec Coop, Inc	TX	333,690	49 min	0.40
Potomac Electric Power Co	DC	347,904	50 min	0.32
Middle Tennessee E M C	TN	355,220	50 min	0.93
El Paso Electric Co	TX	363,341	55 min	0.86
Salt River Project	AZ	1,182,229	1 hr 6 min	1.02
Public Service Elec & Gas Co	NJ	2,575,136	1 hr 6 min	0.72
Nevada Power Co	NV	1,113,426	1 hr 11 min	0.65
Arizona Public Service Co	AZ	1,426,947	1 hr 13 min	0.84
United Illuminating Co	CT	347,254	1 hr 13 min	0.66
Commonwealth Edison Co	IL	4,194,773	1 hr 17 min	0.66
Atlantic City Electric Co	NJ	573,227	1 hr 20 min	0.73

Least reliable large utilities (2025)

Utility	State	Customers	Outage time / customer	Outages / customer
Monongahela Power Co	WV	391,428	20 hr 50 min	3.72
Appalachian Power Co	VA	553,079	18 hr 36 min	2.36
Appalachian Power Co	WV	417,331	17 hr 15 min	2.98
Consumers Energy Co - (MI)	MI	1,899,459	13 hr 40 min	1.40
FirstEnergy Pennsylvania Electric Co	PA	2,084,958	10 hr 47 min	2.02
Entergy Mississippi LLC	MS	464,256	10 hr 40 min	2.61
Wisconsin Public Service Corp	WI	469,667	10 hr 30 min	1.44
Union Electric Co - (MO)	MO	1,284,472	9 hr 54 min	1.18
Puget Sound Energy Inc	WA	1,258,468	9 hr 40 min	1.60
Omaha Public Power District	NE	407,892	9 hr 18 min	1.57
Southern California Edison Co	CA	5,343,161	9 hr 5 min	1.39
Northern Indiana Pub Serv Co	IN	494,852	8 hr 52 min	1.32
Entergy Arkansas LLC	AR	747,309	8 hr 38 min	2.24
Southwestern Public Service Co	TX	270,149	7 hr 21 min	1.71
Los Angeles Department of Water & Power	CA	1,571,400	6 hr 48 min	0.78

Source: EIA-861 2025 Reliability file (IEEE method, all events). Utilities that operate in several states are listed separately for each state. Storm exposure varies widely by territory, so a single year is not a full verdict on a utility.

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You may reuse our derived data under CC BY 4.0 with attribution. Underlying government data is public domain.

PowerOutageTracker.com. "Most and Least Reliable Electric Utilities in the U.S. (2025)." Accessed EIA 2025 data. https://poweroutagetracker.com/reports/most-reliable-electric-utilities