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State profile · IL

Illinois electricity rates

152 residential tariffs from 54 utilities. Across the 16 filed since 2020 that can be fairly compared, the median costs $0.1369 per kWh at 1,000 kWh a month once fixed charges are included — the cheapest $0.0964, the most expensive $0.4680.

$0.1369median $/kWh, all in
54utilities
152tariffs on file
4%time-of-use
14%filed since 2020
Where Illinois sits — effective $/kWh at 1,000 kWh a month
  • 16 comparable tariffs: $0.0964 to $0.4680
  • Illinois median $0.1369
  • US median $0.1658

Rate structures in Illinois

  • Flat 63 (41%)
  • Seasonal + tiered 33 (22%)
  • Tiered 28 (18%)
  • Seasonal 22 (14%)
  • Time-of-use 5 (3%)
  • Time-of-use + tiered 1 (1%)

Lowest effective rates at 1,000 kWh/month

Ranked across tariffs filed since 2020: 19 here, 14% of those on file. Older filings are excluded because they are systematically below what utilities now charge. Of the recent ones, 3 are left out because they price only part of a bill (delivery without the electricity itself, or a single appliance), are open only to some households (such as low-income or electric-vehicle rates), or carry a suspected data error. See methodology. Effective rate includes fixed charges, and availability restrictions may apply.

UtilityTariffStructureFiled $/kWhAnnual
MidAmerican Energy Co RATE GET - GENERAL ENERGY TIME-OF-USE SERVICE (Residential) Time-of-use + tiered 2026 $0.0964 $1,156.71
MidAmerican Energy Co RATE GE - GENERAL ENERGY SERVICE (Residential) Seasonal + tiered 2026 $0.1021 $1,225.32
MidAmerican Energy Co RATE RST - RESIDENTIAL TIME-OF-USE SERVICE Time-of-use 2026 $0.1061 $1,273.53
MidAmerican Energy Co RATE RS - RESIDENTIAL SERVICE Seasonal + tiered 2026 $0.1100 $1,320.20
Commonwealth Edison Co BES - Residential Multi Family With Electric Space Heat Delivery Class Seasonal 2025 $0.1112 $1,333.96
Commonwealth Edison Co BES - Residential Single Family with Electric Space Heat Delivery Class Seasonal 2025 $0.1167 $1,400.32
City of Naperville, Illinois Residential Flat 2022 $0.1223 $1,467.24
Commonwealth Edison Co BES - Residential Multi Family Without Electric Space Heat Delivery Class Seasonal 2025 $0.1279 $1,534.72
Commonwealth Edison Co BES - Residential Single Family Without Electric Space Heat Delivery Class Seasonal 2025 $0.1459 $1,750.64
Ameren Illinois Company DS-1 Residential Zone 1 Seasonal + tiered 2026 $0.1900 $2,280.04

Not a 1,000 kWh household?

Price every Illinois tariff against the usage on your own bill.

Price these at your usage

Guides to these rates

All guides

  1. Guide · 3 min

    Your utility probably offers more than one rate

    At 104 utilities with more than one current residential tariff open to everyone, the cheapest option beat the middle one by a median $71 a year at 1,000 kWh a month — and by more than $250 at 21 of them.

  2. Guide · 3 min

    Heat with electricity? Your utility may have a cheaper rate for it

    25 utilities file a rate for electrically heated homes. At 16 of the 22 that also offer a standard one, it costs less in January, typically $27 a month.

  3. Guide · 3 min

    When is electricity most expensive? It depends on your utility

    Across 95 utilities with time-of-use rates we found 49 different weekday peak windows. Nearly all include 5 to 6 pm; little else is shared.

  4. Guide · 4 min

    Does each extra kWh cost more? It depends where you live

    Of 84 utilities with tiered residential rates, 43 charge more per kWh as usage rises, 23 charge less, and 11 do both: rising in summer, falling in winter.

  5. Guide · 3 min

    Does electricity cost more in summer? At about half of utilities, yes

    Of 174 utilities, 82 charge more for the same 1,000 kWh in July than in January, typically about $12 a month. 19 charge more in winter.