States › Connecticut › Groton Dept of Utilities
municipal utility · EIA utility 7716
Groton Dept of Utilities
Average price is revenue divided by sales for the sector and year; it is not a tariff rate. Reliability figures are as reported by utilities to EIA on Form 861 and may use different calculation methods. Annual figures: Form EIA-861 for 2024, final release. Monthly state figures run to July 2026.
Groton Dept of Utilities is a municipal utility that reported 12,284 residential customers in Connecticut on Form EIA-861 for 2024, with a service territory that touches 1 county.
Its average residential price that year was 18.70¢ per kilowatthour, 35% below the Connecticut average of 28.75¢ and 13% above the US average of 16.48¢. The figure is residential revenue divided by residential sales, so it folds in fixed charges, riders and every rate schedule the utility bills under.
That works out to an average residential bill of $133.68 a month on average use of 715 kWh a month. Across Connecticut the average bill was $199.66 on 695 kWh, so a bill gap reflects how much power households use as well as what each kilowatthour costs.
For reliability it reported a SAIDI of 116.6 minutes per customer with major event days included and 22.5 minutes with them excluded, calculated under IEEE 1366 standard. The median among Connecticut utilities reporting was 186.5 minutes with major event days; this utility's figure is 37% below that median.
The average price is up 17.2% on 2019, against up 31.5% for Connecticut as a whole, and down 6.8% on 2023. EIA's early release for 2025, which has not been fully edited, shows 18.05¢.
Compared with Connecticut, the US and other municipal utilities
| Measure, 2024 | This utility | Municipal utilities, US median | Connecticut | United States |
|---|---|---|---|---|
| Average residential price per kWh | 18.70¢ | 12.45¢ | 28.75¢ | 16.48¢ |
| Average monthly residential bill | $133.68 | $113.02 | $199.66 | $142.26 |
| Average monthly use, kWh | 715 | 905 | 695 | 863 |
| Residential price change, 1 year | -6.8% | — | -3.8% | +3.0% |
| Residential price change, 5 years | +17.2% | — | +31.5% | +26.7% |
| SAIDI, all events (minutes) | 116.6 | 64.4 | 186.5 median | 184.5 median |
| SAIDI, without major event days | 22.5 | 40.3 | 63.1 median | 99.8 median |
State and US prices, bills and use are EIA's own averages over every customer. The ownership column and the reliability columns are medians across utilities with at least 1,000 residential customers, computed on this site from the final 2024 file. Among the 4 filings by municipal utilities in Connecticut, the median price was 19.02¢. In Connecticut this utility's price ranks 5 of 6, counting from the highest.
Average price by year
Groton Dept of UtilitiesConnecticut averageUS average
Year by year
| Year | ¢ per kWh | Connecticut ¢ | Monthly bill | kWh a month | Residential customers | All sales |
|---|---|---|---|---|---|---|
| 2025 early release | 18.05¢ | 29.38¢ | $133.62 | 740 | 12,596 | 407.7 GWh |
| 2024 | 18.70¢ | 28.75¢ | $133.68 | 715 | 12,284 | 384.6 GWh |
| 2023 | 20.07¢ | 29.88¢ | $140.56 | 700 | 12,240 | 400.7 GWh |
| 2022 | 17.68¢ | 24.61¢ | $127.34 | 720 | 12,244 | 460.6 GWh |
| 2021 | 15.90¢ | 21.91¢ | $113.17 | 712 | 12,225 | 460.8 GWh |
| 2020 | 15.96¢ | 22.71¢ | $112.76 | 706 | 12,203 | 424.5 GWh |
| 2019 | 15.95¢ | 21.87¢ | $109.65 | 688 | 12,186 | 444.7 GWh |
| 2018 | 15.67¢ | 21.20¢ | $113.14 | 722 | 12,096 | 445.3 GWh |
| 2017 | 15.92¢ | 20.29¢ | $107.21 | 674 | 12,002 | 440.3 GWh |
| 2016 | 16.06¢ | 20.01¢ | $109.77 | 683 | 11,892 | 435.1 GWh |
| 2015 | 15.93¢ | 20.94¢ | $114.88 | 721 | 12,011 | 451.3 GWh |
| 2014 | 15.84¢ | 19.75¢ | $119.24 | 753 | 11,972 | 465.1 GWh |
| 2013 | 16.25¢ | 17.55¢ | $126.83 | 780 | 11,205 | 467.5 GWh |
Bundled residential service only in the price, bill and use columns. Bill = residential revenue ÷ customers ÷ 12; use = residential sales ÷ customers ÷ 12. EIA describes its early release as not fully edited; it is shown for this utility alone and enters no average, median or rank on this site.
Month by month
Groton Dept of UtilitiesConnecticut average
Sales by sector, 2024
| Sector | Customers | Sales | Share of sales | Revenue | ¢ per kWh, bundled |
|---|---|---|---|---|---|
| Residential | 12,284 | 105.4 GWh | 27% | $19,705,700 | 18.70¢ |
| Commercial | 1,588 | 94.5 GWh | 25% | $17,000,500 | 17.98¢ |
| Industrial | 17 | 184.8 GWh | 48% | $25,015,100 | 13.54¢ |
Customers, sales and revenue count every service type the utility reported (bundled, energy-only and delivery-only). The price column uses bundled service alone, because part-bill revenue would understate it. Sources of energy: 404.8 GWh in total, of which 0% was its own net generation and 404.8 GWh was bought wholesale; summer peak demand 69 MW.
Reliability
Minutes of sustained interruption per customer in 2024, as the utility reported them under IEEE 1366 standard. SAIFI: 0.75 interruptions per customer with major event days, 0.19 without; CAIDI 155.5 minutes per interruption. EIA's Connecticut total across all reporting utilities was 153.6 minutes with major event days and 73.1 without. Major event days are storms and similar events that a utility's chosen method sets apart; methods differ, so treat comparisons as approximate. What SAIDI and SAIFI mean.
| Year | SAIDI, all events | SAIDI, no major events | SAIFI, all events | SAIFI, no major events | Method |
|---|---|---|---|---|---|
| 2025 early release | 71.2 | 71.2 | 0.36 | 0.36 | IEEE 1366 |
| 2024 | 116.6 | 22.5 | 0.75 | 0.19 | IEEE 1366 |
| 2023 | 120.1 | 120.1 | 1.04 | 1.04 | IEEE 1366 |
| 2022 | 32.0 | 17.1 | 0.55 | 0.32 | IEEE 1366 |
| 2021 | 229.3 | 83.3 | 1.74 | 0.90 | IEEE 1366 |
| 2020 | 66.4 | 31.5 | 1.01 | 0.40 | IEEE 1366 |
| 2019 | 144.7 | 70.2 | 1.16 | 0.79 | IEEE 1366 |
| 2018 | 98.0 | 58.3 | 1.24 | 0.71 | IEEE 1366 |
| 2017 | 106.6 | 106.6 | 3.24 | 3.24 | IEEE 1366 |
| 2016 | 106.6 | 106.4 | 8.68 | 8.68 | IEEE 1366 |
| 2015 | 200.6 | 58.5 | 1.28 | 0.74 | IEEE 1366 |
| 2014 | 181.6 | 181.6 | 2.69 | 2.69 | IEEE 1366 |
| 2013 | 57.0 | 57.0 | 0.82 | 0.82 | IEEE 1366 |
Counties in its service territory
Counties the utility listed on Form EIA-861 for 2024. Listing a county does not mean the utility serves all of it.
Other utilities in Connecticut
| Utility | Ownership | Residential customers | ¢ per kWh | Monthly bill | SAIDI, all events | SAIDI, no major events |
|---|---|---|---|---|---|---|
| City of Norwich | Municipal | 18,870 | 22.78¢ | $140.25 | 288.0 | 288.0 |
| Town of Wallingford | Municipal | 21,405 | 15.65¢ | $129.64 | 214.1 | 37.2 |
| Bozrah Light & Power Company | Municipal | 2,434 | 19.33¢ | $160.78 | 277.9 | 184.1 |
| United Illuminating Co | Investor-owned | 312,291 | 34.04¢ | $184.69 | 121.8 | 49.2 |
| Connecticut Light & Power Co | Investor-owned | 1,174,420 | 28.51¢ | $187.10 | 158.8 | 76.9 |
| XOOM Energy Connecticut, LLC energy only | Retail power marketer | 12,460 | — | — | — | — |
| Energywell LLC energy only | Retail power marketer | 54,348 | — | — | — | — |
| Town Square Energy energy only | Retail power marketer | 95,405 | — | — | — | — |
All Connecticut utilities · Municipal utilities nationwide
Questions and answers
How much does electricity cost from Groton Dept of Utilities?
Residential customers paid an average of 18.70¢ per kilowatthour in 2024. EIA derives this by dividing residential revenue by residential sales; it is an average across all rate schedules and charges, not a tariff rate.
How does that compare with Connecticut?
The Connecticut average residential price in 2024 was 28.75¢ and the US average 16.48¢; Groton Dept of Utilities was 35% below the state figure. Among 6 utility filings with a bundled residential price in Connecticut, it had the 5th highest.
What is the average Groton Dept of Utilities bill?
$133.68 a month in 2024, on average residential use of 715 kWh a month (annual revenue and sales divided by customers and by twelve). The Connecticut average was $199.66 on 695 kWh.
How reliable is Groton Dept of Utilities service?
It reported 116.6 minutes of interruption per customer (SAIDI) including major event days and 22.5 minutes excluding them, with 0.75 interruptions per customer (SAIFI) in 2024. Utilities calculate these under differing methods, so comparisons are approximate.
Is the Groton Dept of Utilities price rising?
The average residential price was down 6.8% in 2024 compared with 2023 and up 17.2% compared with 2019. EIA's early, not fully edited release for 2025 shows 18.05¢.
Which counties does Groton Dept of Utilities serve?
Its Form EIA-861 service territory lists 1 county: New London County, CT. A county can appear in several utilities' territories.
Provenance
Source: U.S. Energy Information Administration. Annual figures are from Form EIA-861 (sales to ultimate customers, reliability, operational data and service territory files), final release for 2024, respondent "Groton Dept of Utilities - (CT)", utility number 7716; the 2025 row is from EIA's early release. Monthly utility figures are from the Form EIA-861M sample. State and US averages are from the Form EIA-861M sales and revenue workbook, published through July 2026. All are US government works in the public domain. Page built 1 Oct 2026. Errors in processing are corrected at the next build; see corrections. For tariffs and rate schedules, consult the utility or the state utility commission.