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United Illuminating Co
United Illuminating Co served 53,758 residential customers in Connecticut in 2025 (3.4% of the state's residential customers), the 2nd largest of 15 utilities reporting there. Delivery-only service; ownership: investor owned; balancing authority ISNE.
The meter, one average month.
Scroll to run 30 days of United Illuminating Co's average residential use through a five-dial register.
- Used so far
- 814 kWh
- At 20.17¢/kWh
- $164
Price ruler0 to 50¢ per kWh
Where 20.17¢ sits.
This page covers delivery-only service, which is only part of a household's bill, so its 20.17¢ is not compared with the Connecticut bundled average of 29.38¢. Both are drawn for scale only.
2020 and 2025EIA-861
Five years, same meter.
In 2020 the average United Illuminating Co home used 668 kWh a month at 16.39¢ and paid $109. In 2025 it used 814 kWh at 20.17¢ and paid $164: the price per kWh is up 23.1%.
| Measure | 2020 | 2025 |
|---|---|---|
| Price, ¢/kWh | 16.39 | 20.17 |
| Use, kWh a month | 668 | 814 |
| Bill, US$ a month | 109.46 | 164.07 |
| Class | Customers | MWh sold | ¢/kWh |
|---|---|---|---|
| Residential | 53,758 | 524,797 | 20.17 |
| Commercial | 15,919 | 1,980,602 | 12.57 |
| Industrial | 672 | 344,173 | 12.59 |
Who else is on the line
Homes are one class.
Homes took 18.4% of the electricity United Illuminating Co sold in Connecticut in 2025.
Rooftop solar on its linesnet metering
27,647 roofs.
- Residential net-metered PV
- 27,647installations reported for 2025
- Capacity
- 153.9 MWresidential, net metered
- Per 1,000 homes
- 514.3installations per 1,000 residential customers
Service territoryEIA-861
2 counties.
FairfieldNew Haven
Counties in Connecticut where United Illuminating Co reported serving customers in 2025 (2 in all; up to 24 listed).
EIA-8612025Utility 19497
The filing, line by line.
| Measure | Value | Unit |
|---|---|---|
| Average price | 20.17 | ¢/kWh |
| Connecticut average price | 29.38 | ¢/kWh |
| Price change over 5 years | 23.1 | % |
| Typical monthly use | 814 | kWh |
| Typical monthly bill | 164.07 | US$ |
| Residential customers | 53,758 | accounts |
| Share of CT residential customers | 3.4 | % |
| Size rank in CT | 2 of 15 | by customers |
Rate plans on fileOpenEI URDB
None shown for this page. Plan counts appear once per utility, on its largest state's bundled page; how plans are counted.
Connecticut: state average, five-year steps and every provider