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2.8avg. commissioner years of serviceSource: Advanced Energy United
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13.36ยขavg. price per kWhSource: EIA
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12legislative session length, monthsSource: Legislative Session
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71%residential market share of the largest utilitySource: July 2025, Advanced Energy United
breakdown of market shareUtility Percentage Market Share in Illinois
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Commonwealth Edison Co
Market Share71% -
Ameren Illinois Company
Market Share20%
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7governor years servedSource: July 2025, Advanced Energy United
Utilities
Illinois Utilities
The schedules listed here reflect what is established in statute, rules, or Orders. However, PUCs and utilities sometimes deviate from these schedules. Please check the most recent proceeding by going to the "Important Recurring Proceedings" section for each utility below.
Policy AreaMulti-Year Integrated Grid Plan
ScheduleEach electric utility shall, no later than January 20, 2023, submit its first Multi-Year Integrated Grid Plan. No later than January 20, 2026, and every 4 years thereafter, the utility shall submit its subsequent Plan.
Policy AreaEnergy Efficiency and Demand Response Plan
ScheduleUtilities must file 4-year energy efficiency plans by March 1st every four years, starting on March 1, 2021.
Policy AreaRenewable Resources Procurement Plan
ScheduleThe Illinois Power Agency shall develop a long-term renewable resources procurement plan no later than 160 days after June 1, 2017, which shall be reviewed and may be revised accordingly at least every two years.
Commonwealth Edison Co
Ownership TypeInvestor Owned
Balancing AuthorityPJM Interconnection, LLC
NERC Regional EntityRFC
Holding Company
Structure
Owns Generation
Owns Transmission
Share of Residential Customers in IL71%
Ameren Illinois Company
Ownership TypeInvestor Owned
Balancing AuthorityMidcontinent Independent Transmission System Operator, Inc..
NERC Regional EntitySERC
Holding Company
Structure
Owns Generation
Owns Transmission
Share of Residential Customers in IL20%