Groton Dept of Utilities (CT) electricity rates in Connecticut, 2025
Groton Dept of Utilities (CT)’s 12,596 residential customers paid an average of 18.05¢ per kWh in 2025, 38% below the Connecticut average of 29.31¢. The typical home used 740 kWh a month, for an average bill of $134.
- 18.05¢avg ¢/kWh (2025)−0.65¢ (-3.5%) vs 2024
- $134Avg monthly billConnecticut: $206
- 740 kWhAvg monthly useConnecticut: 704 kWh
- 12,596Residential customersFull-service utility
| Sector | Customers | Sales (MWh) | Revenue | ¢/kWh 2025 | ¢/kWh 2024 | Change |
|---|---|---|---|---|---|---|
| Residential | 12,596 | 111,899 | $20,197,300 | 18.05¢ | 18.70¢ | −0.65¢ (-3.5%) |
| Commercial | 1,580 | 94,793 | $16,672,600 | 17.59¢ | 17.98¢ | −0.40¢ (-2.2%) |
| Industrial | 17 | 201,047 | $28,040,700 | 13.95¢ | 13.54¢ | +0.41¢ (+3.0%) |
| All sectors | 14,193 | 407,739 | $64,910,600 | 15.92¢ | 16.05¢ | −0.13¢ (-0.8%) |
How Groton Dept of Utilities (CT) compares
- Connecticut residential average, 2025: 29.31¢ per kWh, 704 kWh a month, $206 average bill. U.S. average: 17.23¢, 874 kWh, $151.
- Among 6 full-service utilities in Connecticut with at least 1,000 residential customers, Groton Dept of Utilities (CT) ranks 2 of 6 from lowest to highest average price.
- Latest monthly figure: Connecticut homes paid 24.51¢ per kWh in August 2026 (preliminary), against 30.17¢ in August 2025. Summer months often run higher than the annual average.
- From 2024 to 2025 this average fell 3.5%; the state average rose 2.0%.
- Groton Dept of Utilities (CT) is a municipal utility, owned by the local government; the city council or utility board sets rates. Balancing authority: ISNE.
Where Groton Dept of Utilities (CT) serves
EIA lists 1 Connecticut county in its 2025 service territory: New London.
5 ZIP codes are matched to Groton Dept of Utilities (CT) in NREL’s 2024 ZIP file: 06335, 06339, 06340, 06349, 06355. Utility boundaries do not follow ZIP lines, so a ZIP can have more than one provider.
Connecticut full-service utilities with similar rates
| Provider | ¢/kWh | Avg bill | Customers |
|---|---|---|---|
| Town of Wallingford (CT) | 17.78¢ | $152 | 21,426 |
| Bozrah Light & Power Company | 19.75¢ | $169 | 2,440 |
| City of Norwich (CT) | 23.35¢ | $148 | 18,967 |
| Connecticut Light & Power Co | 28.88¢ | $195 | 995,130 |
| United Illuminating Co | 35.40¢ | $183 | 261,151 |
Sources
- U.S. Energy Information Administration, Annual Electric Power Industry Report, Form EIA-861, 2025 final data (f8612025.zip, file dated October 7, 2026): Sales to Ultimate Customers, Average Monthly Bill and Service Territory tables.
- EIA Form EIA-861, 2024 final data (f8612024.zip, file dated December 4, 2025), for the 2024 comparison.
- EIA Electric Power Monthly, Table 5.6.A (average price by state, August 2026 and August 2025; 2026 values are preliminary), file dated October 22, 2026.
- National Renewable Energy Laboratory via OpenEI, U.S. Electric Utility Companies and Rates: Look-up by Zipcode (2024) (investor-owned and other utilities, files dated November 10, 2025), used only to match ZIP codes to utilities.
Average price = residential revenue ÷ residential kWh sold, as reported to EIA. It includes fixed monthly charges, taxes passed through in revenue and seasonal tiers, averaged over the year. Your own rate depends on your tariff and usage.
All Connecticut electricity providers · How we compute rates