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United Illuminating Co
United Illuminating Co served 261,151 residential customers in Connecticut in 2025 (16.5% of the state's residential customers), the 2nd largest of 15 utilities reporting there. Bundled 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
- 516 kWh
- At 35.4¢/kWh
- $183
Price ruler0 to 50¢ per kWh
Where 35.4¢ sits.
United Illuminating Co averaged 35.4¢ per kWh against a Connecticut residential average of 29.38¢: 20.5% above the state figure. Among the 2 investor owned utilities in Connecticut with bundled residential sales, it ranks 2nd from the lowest price.
2020 and 2025EIA-861
Five years, same meter.
In 2020 the average United Illuminating Co home used 560 kWh a month at 25.97¢ and paid $145. In 2025 it used 516 kWh at 35.4¢ and paid $183: the price per kWh is up 36.3%.
| Measure | 2020 | 2025 |
|---|---|---|
| Price, ¢/kWh | 25.97 | 35.4 |
| Use, kWh a month | 560 | 516 |
| Bill, US$ a month | 145.39 | 182.78 |
| Class | Customers | MWh sold | ¢/kWh |
|---|---|---|---|
| Residential | 261,151 | 1,617,881 | 35.4 |
| Commercial | 16,545 | 381,106 | 33.84 |
| Industrial | 217 | 13,071 | 27.37 |
| Transportation | 1 | 13,619 | 13.8 |
Who else is on the line
Homes are one class.
Homes took 79.9% 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
- 105.9installations 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 | 35.4 | ¢/kWh |
| Connecticut average price | 29.38 | ¢/kWh |
| Difference from state average | 20.5 | % |
| Price change over 5 years | 36.3 | % |
| Typical monthly use | 516 | kWh |
| Typical monthly bill | 182.78 | US$ |
| Residential customers | 261,151 | accounts |
| Share of CT residential customers | 16.5 | % |
| Size rank in CT | 2 of 15 | by customers |
| Price rank, investor owned peers | 2 of 2 | 1 = lowest |
Rate plans on fileOpenEI URDB
2 active plans.
- Time-of-use
- 1more than one energy period within a month
- Seasonal only
- 0price changes by month, not by hour
- Median fixed charge
- $13.02US dollars per month
- Median flat energy rate
- 20.01¢cents per kWh, one period and one tier
Active residential plans: not ended, started within the last 5 years, latest version of each plan name. Time-of-use means more than one energy period within a single month; plans whose price changes only by season are counted as seasonal.
Connecticut: state average, five-year steps and every provider