Connecticut electric rates and bill calculators
In November 2026, 1,000 kWh costs from $245.64 on Eversource (Connecticut) to $278.46 on United Illuminating (UI) (2 utilities with a complete bill), before sales tax. That is 24.6¢ to 27.8¢ per kWh with all the charges of the tariff. Select your utility to calculate your own bill. Each calculator uses the tariff of the utility. The Connecticut Public Utilities Regulatory Authority (PURA) approves these tariffs.
- 2 utilities
- Average bill in 2025: $206.46 a month
- Rates checked October 16, 2026
- 9 rate changes in the last 12 months
Utilities in Connecticut
What 1,000 kWh costs in Connecticut (November 2026)
The same bill on the tariff of each utility: 1,000 kWh in a 30-day November billing period, before sales tax. The most expensive utility is first. Compare all 92 utilities.
| Utility | 1,000 kWh | Per kWh | Change from October |
|---|---|---|---|
| United Illuminating (UI)Rate R | $278.46 | 27.85¢ | $0.00 |
| Eversource (Connecticut)Rate 1 | $245.64 | 24.56¢ | $0.00 |
Rate increase requests: Eversource (Connecticut) (Connecticut Public Utilities Regulatory Authority). See pending rate increases.
See all Connecticut electric utilities with their average bills, including the ones without a calculator on this site yet.
Help paying the bill: Eversource (Connecticut) bill help, United Illuminating (UI) bill help.
Cities: electricity in Hartford, electricity in Bridgeport, electricity in Middletown, electricity in New Britain, electricity in New Haven, electricity in Norwich, electricity in Torrington.
Average electric bill in Connecticut
In 2025, the average home in Connecticut used 704 kWh a month and paid $206.46 a month (29.3¢ per kWh). The U.S. average was $150.68 (874 kWh, 17.2¢ per kWh). These are yearly averages from the EIA-861 data of the U.S. Energy Information Administration. See the average electric bill in Connecticut by utility and by month, the average bill in each state, the average bill of an apartment, business electricity rates in Connecticut and natural gas bills in Connecticut. To turn watts or kWh into dollars at the Connecticut price, use the electricity cost calculator.
| Utility | Homes | kWh a month | Price per kWh | Average bill |
|---|---|---|---|---|
| Eversource (Connecticut) | 995,130 | 677 | 28.9¢ | $195.35 |
| United Illuminating (UI) | 261,151 | 516 | 35.4¢ | $182.78 |
The average bill is different from the 1,000 kWh bill above: it uses the real average kWh of each utility's homes and the rates of 2025.
The same bill in each month of the year
1,000 kWh in a 30-day billing period, calculated for each month with the rates in the tariff for that month. Only the rates change, not the kWh, so the difference comes from seasonal rates and monthly charges.
| Utility | Lowest month | Highest month | Difference |
|---|---|---|---|
| Eversource (Connecticut)Rate 1 | $245.64July | $256.28January | $10.64 |
Not in this table: United Illuminating (UI). This utility has a monthly charge that is not published yet for every month of the year.
Rate changes in Connecticut
In the last 12 months, we recorded 9 rate changes in the Connecticut tariffs on this site: 2 increases and 7 decreases. Each value is from the official document in the source link. To see what one change does to your bill, use the rate change tool. Rate increase history: Eversource (Connecticut).
| Date | Utility | Charge | Old | New | Source |
|---|---|---|---|---|---|
| September 1, 2026 | United Illuminating (UI)Rate R | Revenue decoupling adjustment (Rider DR) | −0.3178¢ per kWh | −0.3078¢ per kWh | Source |
| July 1, 2026 | United Illuminating (UI)Rate R | Standard Service generation | 13.695¢ per kWh | 11.9865¢ per kWh | Source |
| July 1, 2026 | United Illuminating (UI)Rate R | Bypassable FMCC | 0¢ per kWh | −0.0392¢ per kWh | Source |
| July 1, 2026 | Eversource (Connecticut)Rate 1 | Generation service charge (Standard Service) | 12.791¢ per kWh | 11.787¢ per kWh | Source |
| July 1, 2026 | Eversource (Connecticut)Rate 1 | Federally mandated congestion charge, generation part | −0.15¢ per kWh | −0.21¢ per kWh | Source |
| May 1, 2026 | United Illuminating (UI)Rate R | Transmission charge | 4.3359¢ per kWh | 4.8722¢ per kWh | Source |
| May 1, 2026 | United Illuminating (UI)Rate R | Combined public benefits charge | 2.7213¢ per kWh | 1.5131¢ per kWh | Source |
| May 1, 2026 | United Illuminating (UI)Rate R | Non-bypassable FMCC (four parts) | 1.3804¢ per kWh | −2.8278¢ per kWh | Source |
| May 1, 2026 | United Illuminating (UI)Rate R | Revenue decoupling adjustment (Rider DR) | −0.2161¢ per kWh | −0.3178¢ per kWh | Source |
Pages for each Connecticut utility
| Utility | Pages |
|---|---|
| Eversource (Connecticut) | Rates and bill calculator · Rate history since 2021 · Standard Service rate (Total Generation Supply Rate) history |
| United Illuminating (UI) | Rates and bill calculator · Standard Service rate history |
How electricity prices work in Connecticut
- Your address decides your utility. The tariff of that utility gives the price of each kWh and the monthly charges.
- Supply. In Connecticut, some homes can buy the supply part of the bill from another company. The default supply price of the utility is the price to compare: Eversource (Connecticut) standard service rate (total generation supply rate) (11.577¢ now), United Illuminating (UI) standard service rate (11.947¢ now). Compare them on one page: Connecticut default electricity price by utility. See all utilities.
- Not in the calculations. Sales tax, city fees and discount programs are not in the tables on this page. The calculator of each utility shows them where the tariff gives them.
What is the average electric bill in Connecticut?
In 2025, the average home in Connecticut used 704 kWh a month and paid $206.46 a month, 29.3¢ per kWh, from the EIA-861 data of the U.S. Energy Information Administration. The U.S. average was $150.68 (874 kWh, 17.2¢ per kWh). Your own bill depends on your utility and your kWh.
How much is a 1,000 kWh electric bill in Connecticut?
In November 2026, 1,000 kWh costs from $245.64 on Eversource (Connecticut) to $278.46 on United Illuminating (UI) (2 utilities with a complete bill), before sales tax. That is 24.6¢ to 27.8¢ per kWh with all the charges of the tariff. The bill is for a 30-day billing period at the standard residential rate of each utility.
Which Connecticut utility has the lowest electric rates?
Of the 2 utilities in the table, Eversource (Connecticut) has the lowest bill for 1,000 kWh in November 2026 ($245.64). You cannot select your utility: it is the utility that serves your address. The order can change with the season and with your kWh.
Are electric rates going up in Connecticut?
In the last 12 months, we recorded 9 rate changes for the Connecticut tariffs on this site: 2 increases and 7 decreases. The most recent: United Illuminating (UI) changed the revenue decoupling adjustment on September 1, 2026.
Why is my electric bill higher in some months in Connecticut?
Many tariffs have seasonal rates or charges that change each month. With the same 1,000 kWh, the Eversource (Connecticut) bill is $256.28 in January and $245.64 in July. Homes also use more kWh for heating and cooling, which adds to the bill. The table of each month on this page shows the difference for each utility.
Who sets electric rates in Connecticut?
The Connecticut Public Utilities Regulatory Authority (PURA) approves the rates of Eversource (Connecticut) and United Illuminating (UI). Each calculator on this site uses the approved tariff of the utility.
This list shows only the utilities with checked tariffs. Some homes in Connecticut get electricity from an electric cooperative or a city utility. We do not have these tariffs yet. Send the name of your utility to contactus@utilityratecalc.com.
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No account needed: Connecticut rate changes (RSS feed) · all rate changes (RSS feed) · a monthly reminder for your calendar · save your bills in this browser. Each month, the bill comparison shows what 1,000 kWh costs at every utility.
State regulator: Connecticut Public Utilities Regulatory Authority (PURA).