State profile · CT
Connecticut electricity rates
24 residential tariffs from 9 utilities. Across the 7 filed since 2020 that can be fairly compared, the median costs $0.3018 per kWh at 1,000 kWh a month once fixed charges are included — the cheapest $0.1630, the most expensive $0.3479.
- 7 comparable tariffs: $0.1630 to $0.3479
- Connecticut median $0.3018
- US median $0.1658
Rate structures in Connecticut
Lowest effective rates at 1,000 kWh/month
Ranked across tariffs filed since 2020: 14 here, 58% of those on file. Older filings are excluded because they are systematically below what utilities now charge. Of the recent ones, 7 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.
| Utility | Tariff | Structure | Filed | $/kWh | Annual |
|---|---|---|---|---|---|
| Groton Dept of Utilities | Residential | Flat | 2025 | $0.1630 | $1,955.76 |
| Groton Dept of Utilities | Residential, GRT | Flat | 2025 | $0.1643 | $1,971.72 |
| Connecticut Light & Power Co | Rate 5 - Residential Electric Heating Service | Flat | 2026 | $0.2909 | $3,491.40 |
| Connecticut Light & Power Co | Rate 1 - Residential Electric Service | Flat | 2026 | $0.3018 | $3,621.00 |
| Connecticut Light & Power Co | Rate 7 - Residential Time-Of-Day Electric Service | Time-of-use | 2026 | $0.3022 | $3,626.89 |
| United Illuminating Co | Residential Service Time-of-Use | Time-of-use | 2026 | $0.3300 | $3,959.74 |
| United Illuminating Co | Residential Service | Flat | 2026 | $0.3479 | $4,175.02 |
Not a 1,000 kWh household?
Price every Connecticut tariff against the usage on your own bill.
Guides to these rates
All guides-
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.
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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.
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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.
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What utilities charged for electricity in 2025
Across 1,199 utilities, the average residential price rose a median 4.1% from 2024 to 2025. At 137 it rose 10% or more; at 227 it fell.
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Co-op, city utility or investor-owned: who charges more?
In 2025, city utilities charged a median 13¢ per kWh, co-ops 14.3¢ and investor-owned utilities 17¢. Co-ops' fixed charges are more than double.