Connecticut · Investor Owned
United Illuminating Co
35.40¢ per kWh, bundled, EIA-861 2025. Average bill $182.78 at 516.3 kWh a month, across 261,151 customers on that row.
Connecticut averaged 29.31¢/kWh and $206.46 a month. The United States averaged 17.23¢/kWh and $150.68. State and national figures come from EIA's Average Bill file.
Revenue divided by sales, EIA-861 Sales to Ultimate Customers, 2025, released October 7, 2026. Texas wires utilities come from the Delivery Companies file. The price and bill use bundled service. Customer count: 261,151, the largest residential count across service types.
Estimate a bill
The figure below is this utility's 2025 EIA residential average.
2025 EIA average
$354.00
35.40¢/kWh × 1,000 kWh. Bundled residential average, EIA-861 2025. The customer charge is already folded into this average, so it stands beside a tariff total rather than being added to it.
Other service rows
Delivery and bundled prices cover different charges, so they are listed separately.
| Row | ¢/kWh | Bill | kWh | Customers |
|---|---|---|---|---|
| Delivery only | 20.17¢ | $164.07 | 813.5 | 53,758 |
Annual history
| Year | ¢/kWh | Avg. bill | Avg. kWh | Customers |
|---|---|---|---|---|
| 2015 | 24.30¢ | $148.59 | 611.5 | 175,205 |
| 2016 | 22.35¢ | $128.11 | 573.2 | 189,235 |
| 2017 | 23.68¢ | $128.98 | 544.7 | 194,728 |
| 2018 | 25.31¢ | $143.98 | 568.9 | 206,251 |
| 2019 | 25.23¢ | $135.12 | 535.6 | 214,360 |
| 2020 | 25.97¢ | $145.39 | 559.9 | 229,087 |
| 2021 | 25.19¢ | $140.92 | 559.4 | 245,034 |
| 2022 | 23.55¢ | $130.52 | 554.1 | 270,343 |
| 2023 | 33.16¢ | $167.24 | 504.4 | 263,416 |
| 2024 | 34.04¢ | $184.69 | 542.5 | 256,302 |
| 2025 | 35.40¢ | $182.78 | 516.3 | 261,151 |
EIA-861, 2015–2025, using the same service type as the 2025 figure. A blank year means that service was not in the file.
Counties
Fairfield, New Haven.
EIA-861 Service Territory, 2025. A listed county is the county EIA recorded. It does not mean every address in the county is served. Open this utility in the bill calculator · Rate history tool