United Illuminating (UI) electric rates and bills

UI's price per kWh in three periods

United Illuminating, legally The United Illuminating Company, owns the wires to 314,909 Connecticut homes, 20.1% of the state's residential customers. Of those, 261,151¹ also bought their supply from UI in 2025 on standard service. EIA's price figures describe those full-service (bundled) homes only, and they come in three periods that should not be confused:

Each figure is average revenue per kWh: what those homes paid UI in total, divided by the kWh they used. The customer charge, distribution, transmission, the standard service generation charge and the public benefits charges are all inside it; most taxes are not. A home using less than average pays more per kWh than this, a home using more pays less.

The 2025 figure was 20.8% above the Connecticut average. Among the 5 Connecticut utilities with 10,000 or more full-service homes, UI's average ranked the highest. Eversource, which serves most of the rest of the state, averaged 28.88¢ per kWh; the town-owned Town of Wallingford averaged 17.78¢ per kWh. Among the 177 utilities with 100,000 or more residential customers, the four averages above UI's belonged to SDG&E (California), Hawaiian Electric (Hawaii), PG&E (California) and Con Edison (New York); the median was 15.07¢ per kWh. UI's average was 99.1% above the national average for investor-owned utilities¹.

United IlluminatingConnecticut average, all providers

Source: EIA-861M monthly sales and revenue by utility; EIA, Electric Power Monthly / EIA-861M sales and revenue by state. Residential revenue divided by kWh in each month, as reported to EIA's monthly survey (EIA-861M; months since January 2026 preliminary). Bundled (default-service) customers only.

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Month	United Illuminating (¢/kWh)	kWh per customer	Bill per customer
January 2025	36.02¢	635	$228.72
February 2025	35.77¢	539	$192.67
March 2025	38.11¢	449	$170.98
April 2025	37.41¢	395	$147.66
May 2025	38.81¢	358	$138.89
June 2025	37.40¢	545	$203.86
July 2025	35.34¢	753	$266.17
August 2025	35.95¢	549	$197.42
September 2025	33.07¢	437	$144.66
October 2025	32.73¢	384	$125.60
November 2025	32.80¢	514	$168.69
December 2025	32.76¢	636	$208.45
January 2026	34.19¢	663	$226.60
February 2026	34.45¢	589	$202.89
March 2026	36.49¢	473	$172.50
April 2026	37.18¢	373	$138.67
May 2026	32.80¢	384	$125.83
June 2026	31.21¢	546	$170.28
July 2026	28.27¢	725	$204.87
August 2026	28.27¢	703	$198.75

2026: a lower monthly average after the May 1 decision

EIA's monthly sample shows UI's price turning down. In August 2026³ its full-service homes paid an average of 28.27¢ per kWh, −21.4% against August 2025, and the 12-month average of 32.49¢ per kWh² was already below the 2025 annual figure of 35.40¢ per kWh¹. All 2026 months are preliminary until EIA's final survey.

On April 22, 2026 the Public Utilities Regulatory Authority conditionally approved decreased rates for Eversource and UI through their rate adjustment mechanisms, effective May 1, 2026 through April 30, 2027; UI's interim decision is docket 26-01-04. PURA attributed the decreases to lower public benefits charges, mainly the costs of the Millstone and Seabrook nuclear contracts, and to lower hardship protection costs. The governor's office announced in September 2026 state bonding to keep that public benefits reduction in place through at least April 30, 2027, and said supply rates that took effect on July 1, 2026 had also come down.

The year before went the other way. From 2024 to 2025 UI's full-service average rose 4.0%, from 34.04¢ per kWh⁴ to 35.40¢ per kWh¹, while the statewide residential average rose 1.9%⁵.

Why a high price did not mean a high bill

UI's full-service homes used 516 kWh a month on average in 2025, against 704 kWh for the average Connecticut home and 677 kWh for Eversource's full-service homes. The smaller kWh total more than offset the higher price: UI's average bill was $182.78, Eversource's $195.35¹ and the state's $206.46, which was the 2nd highest⁶ among the states.

Use per home also fell. It went from 543 kWh a month in 2024 to 516 kWh in 2025, so the average bill changed by −1.0%¹ (from $184.69⁴) even though the price per kWh rose. These figures count only electricity bought through UI's meters; power that rooftop panels produce and use on site is not in them.

Low use is common among the country's highest-priced utilities. In 2025 full-service homes used 367 kWh a month at SDG&E, 468 kWh at Hawaiian Electric, 464 kWh at PG&E and 373 kWh at Con Edison, against 516 kWh¹ at UI.

SDG&E (CA)367

Con Edison (NY)373

PG&E (CA)464

Hawaiian Electric (HI)468

National Grid (MA)487

United Illuminating (CT)516

Source: EIA-861 annual electric power industry report, 2025 final. EIA-861 2025 final. Average revenue per kWh is all charges divided by kWh; it is not a tariff rate.

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Utility	average monthly residential use
SDG&E (CA)	367
Con Edison (NY)	373
PG&E (CA)	464
Hawaiian Electric (HI)	468
National Grid (MA)	487
United Illuminating (CT)	516

July bills and April bills

UI's monthly data cover the 12 months September 2025 to August 2026. Use per home peaked at 725 kWh in July 2026, with an average bill of $204.87, and bottomed at 373 kWh in April 2026, with $138.67. April came before the May 1 rate change, so that low bill reflects low use rather than lower charges; the July bill already carried the reduced rates. Across the 12 months the average home used 536 kWh and paid $174.14² a month.

437Sep

384Oct

514Nov

636Dec

663Jan

589Feb

473Mar

373Apr

384May

546Jun

725Jul

703Aug

Source: EIA-861M monthly sales and revenue by utility. kWh per residential customer in each month (EIA-861M; months since January 2026 preliminary). The table adds the average bill and price for the month.

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Month	kWh per customer	Bill per customer	¢/kWh
September 2025	437	$144.66	33.07¢
October 2025	384	$125.60	32.73¢
November 2025	514	$168.69	32.80¢
December 2025	636	$208.45	32.76¢
January 2026	663	$226.60	34.19¢
February 2026	589	$202.89	34.45¢
March 2026	473	$172.50	36.49¢
April 2026	373	$138.67	37.18¢
May 2026	384	$125.83	32.80¢
June 2026	546	$170.28	31.21¢
July 2026	725	$204.87	28.27¢
August 2026	703	$198.75	28.27¢

Homes with a supplier pay UI for delivery only

Connecticut lets households buy supply from a licensed supplier while UI keeps delivering it. In 2025, 17.1% of the residential customers on UI's wires, 53,758¹ homes, did so. EIA reports their figures separately, and they cover a different part of the bill:

• delivery-only homes paid UI an average of 20.17¢ per kWh for delivery in 2025, a change of +3.0% from 19.59¢ per kWh⁴ in 2024;
• their average delivery bill was $164.07 for 814 kWh¹ a month, with the supplier's charge on a separate line and outside EIA's UI figures.

These homes used far more electricity than UI's standard-service homes (814 kWh against 516 kWh), so the two groups' bills cannot be set side by side as if they described the same household. Across every Connecticut supplier contract in force during 2025, suppliers billed residential customers an average of 11.78¢ per kWh¹ for supply alone; that is a past average across all contracts, not an offer. The Connecticut retail choice guide explains how to read the standard service rate on a bill and compare it with an offer.

Smart meters and time-of-use, unlike the rest of the state

In EIA's 2025 meter count, 92.8% of UI's residential meters were advanced (smart) meters, against 0.0% at Eversource. Because Eversource serves most Connecticut homes, the state as a whole had the 3rd lowest smart-meter share among the 50 states and DC. Time-varying pricing follows the meters: UI reported time-of-use rates with 71,060 residential customers enrolled, 22.6%⁷ of the homes on its wires. UI's tariff sets the peak hours and prices; the time-of-use guide explains how such rates change a bill.

UI also reported 27,647 net-metered residential solar installations with 153.9 megawatts of capacity, 87.8⁷ per 1,000 residential customers.

Fewer outage minutes than Connecticut's average

UI customers averaged 73 minutes without power in 2025 counting major storms, fewer than the Connecticut average of 211 minutes, and 39 minutes on days without major events, against 86 minutes statewide. The average customer had 0.66 interruptions over the year (Connecticut: 0.99). Eversource's Connecticut customers averaged 217 minutes⁸ including major events. All of these follow the IEEE 1366 standard, as do the New England utilities in the chart below; a single year with or without a major storm can move these figures a lot.

United Illuminating (CT)73

Eversource (MA)113

National Grid (MA)133

Eversource (NH)161

Rhode Island Energy (RI)183

Eversource (CT)217

Central Maine Power (ME)318

Source: EIA-861 2025, reliability. EIA-861 2025 final. Average revenue per kWh is all charges divided by kWh; it is not a tariff rate.

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Utility	outage minutes per customer (all events)
United Illuminating (CT)	73
Eversource (MA)	113
National Grid (MA)	133
Eversource (NH)	161
Rhode Island Energy (RI)	183
Eversource (CT)	217
Central Maine Power (ME)	318

Service area: two counties, both shared

EIA's 2025 service-territory records list UI in 2 of Connecticut's legacy counties, the units EIA still reports: Fairfield County and New Haven County. In 2⁹ of them at least one other distribution utility also reports customers, so neither county is UI's alone. EIA has no price for Bridgeport, New Haven or any other town; the figures on this page are UI-wide, and UI's own service map decides which utility serves an address.

United Illuminating onlyUnited Illuminating and other utilitiesOther utilities

Source: EIA-861 2025, service territory; Census Bureau, Cartographic boundary file, counties. EIA-861 2025 service territory: 2 counties. Counts whole counties even where the utility serves only part of one; check the utility's own service-area map for an address.

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County	Other utilities reporting service
Fairfield County	Eversource, City of South Norwalk, Norwalk Third Taxing District
New Haven County	Eversource, Town of Wallingford

Business customers

UI's 16,545 full-service commercial customers paid an average of 33.84¢ per kWh in 2025, with an average monthly bill of $649.50; its 217 full-service industrial accounts paid 27.37¢ per kWh. Across all customer classes the average was 34.91¢ per kWh. Businesses with a supplier paid UI 12.57¢ per kWh (commercial) and 12.59¢ per kWh¹ (industrial) for delivery alone, separate from their supply contracts.

Households struggling with bills can apply for energy assistance; Connecticut's federal LIHEAP allocation was $90.2 million¹¹ for fiscal 2026. The Connecticut page covers the statewide picture and help paying bills.