United Illuminating Co. electricity rates
Investor-owned utility · Connecticut · NPCC region · ISONE
United Illuminating Co. is a for-profit, investor-owned utility regulated by the state utility commission, serving 261,151 homes in Connecticut. Its residential customers pay an average of 33.26¢/kWh including fixed and delivery charges, 85% more than the U.S. average.
Rate basis: EIA-861M monthly utility data, 12 months ending 2026-07.
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United Illuminating Co. bill estimates
| Monthly use | At average all-in rate | Base tariff charges* |
|---|---|---|
| 500 kWh | $166.30 | $180.47 |
| 1,000 kWh | $332.60 | $347.92 |
| 1,500 kWh | $498.90 | $515.37 |
| 2,000 kWh | $665.20 | $682.82 |
*Residential Service (effective 2026-01-01, $13.02/month customer charge), energy and fixed charges from the OpenEI Utility Rate Database. Riders, fuel adjustments and taxes are often billed separately, so real bills usually land closer to the all-in column. Calculate your bill.
United Illuminating Co. residential rate plans
| Plan | Effective | Customer charge | Energy charges |
|---|---|---|---|
| Residential Service | 2026-01-01 | $13.02 | 33.49¢ |
| Residential Service Time-of-Usetime-of-use | 2026-01-01 | $13.02 | 11.6¢ (12am–12pm, 8pm–12am) · 32.9¢ (12pm–8pm) — summer weekdays |
| Residential Service Time-of-Usetime-of-use | 2026-01-01 | $13.02 | 24.4¢ (12am–12pm, 8pm–12am) · 49.1¢ (12pm–8pm) — summer weekdays |
| Residential Service | 2026-01-01 | $13.02 | 19.79¢ |
Source: OpenEI U.S. Utility Rate Database. Rates change. Check the linked tariff or your bill for current figures.
United Illuminating Co. rate history
2015–2025: +46% change in the average residential rate (24.30¢ → 35.40¢). Annual EIA-861 data.
Outages & reliability
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Reliability history
| 2025 | United Illuminating Co. | Connecticut avg | U.S. avg |
|---|---|---|---|
| Outage minutes per customer (SAIDI) | 73 | 184 | 266 |
| Outages per customer (SAIFI) | 0.66 | 0.93 | 1.34 |
| Average restoration time (CAIDI) | 111 min | — | — |
| Outage minutes excluding major storms | 39 | 77 | 121 |
Outages in counties served (2025)
From ORNL EAGLE-I, which tracks customers without power every 15 minutes. These counts cover every utility in each county. Weighted across United Illuminating Co.'s counties, customers averaged 65 min without power.
| County | Outage min/customer | Days with outages | Peak customers out | Worst day |
|---|---|---|---|---|
| Fairfield | 81 | 12 | 9,412 | 2025-02-17 |
| New Haven | 52 | 10 | 12,796 | 2025-02-16 |
United Illuminating Co. service area
United Illuminating Co. serves 2 counties in Connecticut and 78 ZIP codes.
Fairfield, New Haven
Cities: Bridgeport, New Haven, Meriden, Hamden, Fairfield, West Haven, Milford, Stratford, City of Milford (balance), Shelton, Trumbull, Cheshire, Branford, East Haven, Westport, North Haven, Guilford, Ansonia, Wallingford Center, Wallingford, Seymour, North Branford, Orange, Derby, Oxford, Woodbridge, Easton, Branford Center, Cheshire Village, Durham, Guilford Center, Newtown, Southport, Woodmont
Programs, smart meters & solar
| Smart meters (AMI) for homes | 93% |
| Customers with daily usage data online | 314,909 |
| Time-based rate programs | Time-of-use rates |
| Homes on time-based rates | 71,060 |
| Net-metered solar homes | 27,647 |
| Home batteries paired with solar | 46 |
| Homes in demand response (e.g. thermostat rebates) | 10,221 |
| Residential efficiency incentives paid (2025) | $14,781,131 |
| Residential energy saved by programs | 2,694 MWh |
United Illuminating Co. at a glance
| Ownership | Investor-owned utility |
| Services | Transmission, Distribution |
| Commercial rate | 32.24¢/kWh |
| Industrial rate | 26.07¢/kWh |
| Retail revenue (2025) | $707,193,200 |
| Electricity sold (2025) | 2,025,677 MWh |
| Peak demand | 1,282 MW summer · 768 MW winter |
| Line losses | 6.3% |
| Balancing authority | ISNE |
| EIA utility ID | 19497 |
| Website | www.energizect.com |
Other utilities in Connecticut
Frequently asked questions
What is United Illuminating Co.'s electricity rate?
United Illuminating Co. residential customers pay an average of 33.26¢ per kWh, all charges included (EIA-861M monthly utility data, 12 months ending 2026-07). That's 19% above the Connecticut average of 27.99¢ and 85% above the U.S. average.
What is the average United Illuminating Co. electric bill?
About $172 a month. The average United Illuminating Co. home uses 516 kWh a month. At 1,000 kWh the bill would be about $333.
How many customers does United Illuminating Co. have?
United Illuminating Co. serves 261,151 residential customers and 348,263 customers in total in Connecticut, across 2 counties.
How reliable is United Illuminating Co.?
In 2025, the average United Illuminating Co. customer was without power for 73 min (SAIDI) over 0.66 interruptions (SAIFI), including major storms. Excluding major event days it was 39 min. The Connecticut average was 3 hr 4 min and the U.S. average 4 hr 26 min.
Does United Illuminating Co. offer time-of-use rates?
Yes. The OpenEI rate database lists 2 time-of-use residential plans, including Residential Service Time-of-Use. Running big appliances off-peak can cut their cost. Pick the plan in the calculator above to see by how much.
Does United Illuminating Co. offer net metering for solar?
United Illuminating Co. had 27,647 residential net-metered customers in 2025 with 153.9 MW of capacity and 46 solar-paired batteries. Estimate solar savings at this utility's rate.
Sources: EIA-861 2025 and EIA-861M (through July 2026), OpenEI URDB, ORNL EAGLE-I, U.S. Census. Methodology. Spot an error? Rates change often, so confirm with United Illuminating Co. before making decisions.