United Illuminating Co electricity rates in Connecticut, 2025
United Illuminating Co’s 261,151 residential customers paid an average of 35.40¢ per kWh in 2025, 21% above the Connecticut average of 29.31¢. The typical home used 516 kWh a month, for an average bill of $183.
- 35.40¢avg ¢/kWh (2025)+1.36¢ (+4.0%) vs 2024
- $183Avg monthly billConnecticut: $206
- 516 kWhAvg monthly useConnecticut: 704 kWh
- 261,151Residential customersFull-service utility
| Sector | Customers | Sales (MWh) | Revenue | ¢/kWh 2025 | ¢/kWh 2024 | Change |
|---|---|---|---|---|---|---|
| Residential | 261,151 | 1,617,881 | $572,784,100 | 35.40¢ | 34.04¢ | +1.36¢ (+4.0%) |
| Commercial | 16,545 | 381,106 | $128,952,600 | 33.84¢ | 24.27¢ | +9.57¢ (+39.4%) |
| Industrial | 217 | 13,071 | $3,577,100 | 27.37¢ | 17.56¢ | +9.81¢ (+55.9%) |
| Transportation | 1 | 13,619 | $1,879,400 | 13.80¢ | 7.86¢ | +5.94¢ (+75.5%) |
| All sectors | 277,914 | 2,025,677 | $707,193,200 | 34.91¢ | 31.16¢ | +3.75¢ (+12.0%) |
How United Illuminating Co 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, United Illuminating Co ranks 6 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 rose 4.0%; the state average rose 2.0%.
- Another 53,758 residential customers buy supply from a competitive supplier and pay United Illuminating Co only for delivery, averaging 20.17¢ per kWh for that service.
- United Illuminating Co is an investor-owned utility, a private company whose rates are set by the state utility commission. Balancing authority: ISNE.
Where United Illuminating Co serves
EIA lists 2 Connecticut counties in its 2025 service territory: Fairfield, New Haven.
78 ZIP codes are matched to United Illuminating Co in NREL’s 2024 ZIP file: 06401, 06405, 06410, 06418, 06422, 06437, 06450, 06451, 06455, 06460, 06461, 06468, 06470, 06471, 06472, 06473, 06477, 06478, 06483, 06484, 06492, 06494, 06495, 06501, 06502, 06503, 06504, 06505, 06506, 06507, 06508, 06509, 06510, 06511, 06512, 06513, 06514, 06515, 06516, 06517, 06518, 06519, 06520, 06521, 06524, 06525, 06530, 06531, 06532, 06533, 06534, 06535, 06536, 06537, 06538, 06540, 06601, 06602, 06604, 06605, and 18 more. 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 |
| Groton Dept of Utilities (CT) | 18.05¢ | $134 | 12,596 |
| 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 |
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.
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