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Electric companies in Illinois

74 electric utilities serve Illinois, according to US EIA-861 service-territory filings and live outage feeds. The largest by customers is Commonwealth Edison Co, with about 4,158,411 customers in Illinois (US EIA-861, 2025). About 24% of the customers on file (1,463,139) buy their electricity from a separate retail supplier; the utility listed here still delivers it and restores outages.

Territory is filed by county, so a county can list several utilities; usually only one serves a given address, and your electric bill names it.

Find yours by ZIP code

Every electric utility in Illinois

Largest first, by customers on its lines in Illinois (US EIA-861, 2025). “Live” is whether MassOutage can see its outages.

UtilityTypeCustomersCountiesLiveReport an outage
Commonwealth Edison CoInvestor Owned4,158,41125Live · county-
Ameren Illinois CompanyInvestor Owned1,229,93981Live · county-
MidAmerican Energy CoInvestor Owned86,3573Live · county-
City of Springfield - (IL)Municipal70,8711Live · county-
City of Naperville - (IL)Municipal64,0252No live feed-
Corn Belt Energy CorporationCooperative37,46818Live · county-
Southeastern IL Elec Coop, IncCooperative25,18610Live · county-
Southwestern Electric Coop Inc - (IL)Cooperative24,88511Live · county-
Norris Electric Coop-20,39010No live feed-
Jo-Carroll Energy, IncCooperative20,2684Live · county-
City of St Charles - (IL)Municipal17,0272No live feed-
Tri-County Electric Coop, Inc (IL)Cooperative16,61210Live · county-
Egyptian Electric Coop AssnCooperative15,46210Live · county-
Wayne-White Counties Elec Coop-13,65511No live feed-
Eastern Illinois Elec CoopCooperative13,35610No live feed-
City of Batavia - (IL)Municipal11,4621No live feed-
Southern Illinois Elec CoopCooperative11,2168No live feed-
Menard Electric CoopCooperative10,9848No live feed-
Rock Energy CooperativeCooperative10,4624Live · county-
Illinois Rural Electric CoopCooperative10,31310No live feed-
City of Geneva - (IL)Municipal10,2461No live feed-
Shelby Electric Coop, IncCooperative10,0659Outages only-
Coles-Moultrie Electric Coop-9,6468No live feed-
M J M Electric Cooperative IncCooperative9,5917No live feed-
Adams Electric CoopCooperative9,1636No live feed-
Monroe County Elec Coop, IncCooperative7,5843No live feed-
Rochelle Municipal Utilities - (IL)Municipal7,1392No live feed-
City of HighlandMunicipal6,9124No live feed-
Village of Chatham - (IL)-6,4211No live feed-
Clinton County Elec Coop, Inc-6,2776No live feed-
Village of Rantoul - (IL)-6,0991No live feed-
Rural Electric Conven CoopCooperative6,0115No live feed-
City of Peru - (IL)-5,9471No live feed-
City of Rock Falls - (IL)-5,3621No live feed-
Enerstar Power CorpCooperative5,3055No live feed-
Mt Carmel Public Utility CoInvestor Owned5,2361No live feed-
City of Waterloo - (IL)-5,2201No live feed-
Village of Winnetka - (IL)Municipal5,0441No live feed-
McDonough Power Coop-4,9807No live feed-
Spoon River Electric Coop, Inc-4,8905No live feed-
City of Princeton - (IL)-4,5861No live feed-
City of Mascoutah - (IL)-4,2251No live feed-
City of Geneseo - (IL)-3,8051No live feed-
City of Metropolis - (IL)-3,7221No live feed-
Western Illinois Elec Coop-3,5734No live feed-
Clay Electric Coop IncCooperative3,2617No live feed-
City of Fairfield- (IL)-3,2411No live feed-
City of Carmi - (IL)-3,0561No live feed-
City of Sullivan - (IL)-3,0541No live feed-
City of Marshall - (IL)-2,8451No live feed-
City of Flora - (IL)-2,7541No live feed-
City of Oglesby - (IL)-2,4991No live feed-
City of Breese - (IL)-2,4691No live feed-
City of Red Bud - (IL)-2,3671No live feed-
Village of Freeburg - (IL)-2,3011No live feed-
City of Carlyle - (IL)-2,0181No live feed-
City of Casey - (IL)-1,8371No live feed-
Village of Riverton - (IL)-1,7261No live feed-
City of Newton - (IL)-1,6331No live feed-
City of McLeansboro - (IL)-1,5851No live feed-
City of Bushnell - (IL)-1,5751No live feed-
City of Altamont - (IL)-1,5071No live feed-
City of Farmer City - (IL)-1,2611No live feed-
Cairo Public Utility Company-1,1272No live feed-
Village of Greenup - (IL)-9821No live feed-
City of Roodhouse - (IL)-9361No live feed-
Village of Bethany - (IL)-6851No live feed-
Village of Ladd - (IL)-6751No live feed-
City of Albany - (IL)-5171No live feed-
Scenic Rivers Energy CoopCooperative122No live feed-
University of Illinois-12No live feed-
Ameren--63No live feed-
Northern Indiana Pub Serv CoInvestor Owned-2Outages only-
City of Allendale- (IL)--1No live feed-

Electric utilities by county

Each county's utilities, largest in the state first. The county name opens its live outage page.

Electric companies in Illinois: FAQ

How many electric companies serve Illinois?
74 electric utilities serve Illinois, according to US EIA-861 service-territory filings and live outage feeds.
What is the largest electric company in Illinois?
Commonwealth Edison Co, with about 4,158,411 customers in Illinois (US EIA-861, 2025).
Which electric company serves my address in Illinois?
Your electric bill names it. Service territory is filed by county, so MassOutage lists the utilities serving each Illinois county; usually only one of them serves a given address, and a utility can tell you whether it serves yours.
Who do I call to report a power outage in Illinois?
Your electric utility. MassOutage has an outage phone line, report page or outage map on file for 0 of the 74 utilities serving Illinois, listed above; for the others, check your bill or the utility's website. For a downed power line, stay at least 35 feet away and call 911.

Live power outages in Illinois →

Data from EIA Form 861 (utility reliability), every source we read. Service territory and customer counts are each utility's own EIA-861 filing; a utility a live outage feed has reported in a county is listed there too.