Connecticut electricity rates
24 residential tariffs from 9 utilities. Across the 14 filed since 2020, the median costs $0.2015 per kWh at 1,000 kWh a month once fixed charges are included — the cheapest $0.1141, the most expensive $0.3479.
$0.2015median $/kWh
9utilities
24tariffs on file
25%time-of-use
58%filed since 2020
Rate structures in Connecticut
| Structure | Tariffs |
|---|---|
| Flat | 14 |
| Tiered | 4 |
| Time-of-use | 4 |
| Time-of-use + tiered | 2 |
Lowest effective rates at 1,000 kWh/month
Ranked across the 14 tariffs filed since 2020 — 58% of those on file here. Older filings are excluded because they are systematically below what utilities now charge; see methodology. Effective rate includes fixed charges, and availability restrictions may apply.
| Utility | Tariff | Structure | Filed | $/kWh | Annual |
|---|---|---|---|---|---|
| Connecticut Light & Power Co | Rate 18- Controlled Water Heating Electric Service | Flat | 2026 | $0.1141 | $1,368.96 |
| Connecticut Light & Power Co | Rate 5 - Residential Electric Heating Service | Flat | 2026 | $0.1615 | $1,938.48 |
| 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 7 - Residential Time-Of-Day Electric Service | Time-of-use | 2026 | $0.1714 | $2,057.44 |
| Connecticut Light & Power Co | Rate 1 - Residential Electric Service | Flat | 2026 | $0.1723 | $2,068.08 |
| United Illuminating Co | Residential Service Time-of-Use | Time-of-use | 2026 | $0.1920 | $2,304.39 |
| United Illuminating Co | Residential Service | Flat | 2026 | $0.2110 | $2,531.62 |
| Connecticut Light & Power Co | Rate 18- Controlled Water Heating Electric Service | Flat | 2026 | $0.2348 | $2,817.84 |
| Connecticut Light & Power Co | Rate 5 - Residential Electric Heating Service | Flat | 2026 | $0.2909 | $3,491.40 |