35.40¢
per kWh, 2025
[ United Illuminating / CT ]
United Illuminating electricity rates in Connecticut
NO RATE CASE ON FILE · DATA 2025
change in average rate, 2024→2025
+4.0%
vs 2024
314,909
residential customers
+36.3%
since 2020
What your bill becomes
Bill today
No change on file
Difference / month · / year
Estimated at United Illuminating's average effective residential rate (35.40¢/kWh, EIA, all charges included). Your tariff, fees and taxes differ.
Rate history 2015–2025
| Year | ¢/kWh | Change | Customers |
|---|---|---|---|
| 2015 | 24.30¢ | — | 287,894 |
| 2016 | 22.35¢ | −8.0% | 298,188 |
| 2017 | 23.68¢ | +6.0% | 300,557 |
| 2018 | 25.31¢ | +6.9% | 302,818 |
| 2019 | 25.23¢ | −0.3% | 304,670 |
| 2020 | 25.97¢ | +2.9% | 306,846 |
| 2021 | 25.19¢ | −3.0% | 309,016 |
| 2022 | 23.55¢ | −6.5% | 310,104 |
| 2023 | 33.16¢ | +40.8% | 310,513 |
| 2024 | 34.04¢ | +2.6% | 312,291 |
| 2025 | 35.40¢ | +4.0% | 314,909 |
How this compares
29.31¢
Connecticut average, 2025
+20.8%
United Illuminating vs CT 2025 average
+105.5%
vs US 2025 average
#1
priciest in CT
United Illuminating files with the EIA as United Illuminating Co (utility ID 19497).
Serves 2 counties in Connecticut: Fairfield, New Haven. 78 ZIP codes.
Questions
Is United Illuminating raising rates in 2026?
No rate case for United Illuminating is on file with the Public Utilities Regulatory Authority in our tracker. Its average residential rate moved +4.0% from 2024 to 2025. We check the commission docket monthly.
What does United Illuminating charge per kWh?
United Illuminating's average effective residential rate was 35.40¢ per kWh in 2025 (EIA-861, revenue divided by sales, all charges included). Connecticut's 2025 average was 29.31¢.
How much have United Illuminating rates gone up in five years?
+36.3% between 2020 and 2025, against +9.3% for Connecticut as a whole over the latest five-year window.
How many customers does United Illuminating have in Connecticut?
314,909 residential customers in 2025, across 2 counties including Fairfield, New Haven, according to the EIA-861 survey.
Where do these numbers come from?
Rates and customer counts are from the US Energy Information Administration's annual EIA-861 survey; rate-case facts are from the Public Utilities Regulatory Authority docket linked on this page. Nothing here is a utility bill; use it to understand the direction and size of changes.
Sources
- EIA-861 Sales to Ultimate Customers, 2015–2025 (released 2026-10-07)
- EIA-861M monthly state averages through Jul 2026
- NREL utility-by-ZIP lookup (2024)