States › New Hampshire › Unitil Energy Systems
investor-owned utility · EIA utility 24590
Unitil Energy Systems
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.
In its Form EIA-861 filing for 2024, Unitil Energy Systems, an investor-owned utility, reported 68,602 residential customers in New Hampshire, with a service territory that touches 2 counties.
Its average residential price that year was 23.33¢ per kilowatthour, about the same as the New Hampshire average of 23.40¢ and 42% 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 $143.57 a month on average use of 615 kWh a month. Across New Hampshire the average bill was $144.87 on 619 kWh, so a bill gap reflects how much power households use as well as what each kilowatthour costs.
The price covers the 39,656 residential customers on bundled service. A further 28,946 take delivery only and buy their energy from another supplier; EIA collects just part of their bill from this respondent, so they are left out of the average.
For reliability it reported a SAIDI of 593.4 minutes per customer with major event days included and 97.7 minutes with them excluded, calculated under IEEE 1366 standard. The median among New Hampshire utilities reporting was 689.8 minutes with major event days; this utility's figure is 14% below that median.
The average price is up 24.8% on 2019, against up 16.7% for New Hampshire as a whole, and down 28.1% on 2023.
Compared with New Hampshire, the US and other investor-owned utilities
| Measure, 2024 | This utility | Investor-owned utilities, US median | New Hampshire | United States |
|---|---|---|---|---|
| Average residential price per kWh | 23.33¢ | 16.17¢ | 23.40¢ | 16.48¢ |
| Average monthly residential bill | $143.57 | $131.47 | $144.87 | $142.26 |
| Average monthly use, kWh | 615 | 787 | 619 | 863 |
| Residential price change, 1 year | -28.1% | — | -16.9% | +3.0% |
| Residential price change, 5 years | +24.8% | — | +16.7% | +26.7% |
| SAIDI, all events (minutes) | 593.4 | 278.7 | 689.8 median | 184.5 median |
| SAIDI, without major event days | 97.7 | 106.5 | 95.2 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 3 filings by investor-owned utilities in New Hampshire, the median price was 22.87¢. In New Hampshire this utility's price ranks 2 of 4, counting from the highest.
Average price by year
Unitil Energy SystemsNew Hampshire averageUS average
Year by year
| Year | ¢ per kWh | New Hampshire ¢ | Monthly bill | kWh a month | Residential customers | All sales |
|---|---|---|---|---|---|---|
| 2024 | 23.33¢ | 23.40¢ | $143.57 | 615 | 68,602 | 1.1 TWh |
| 2023 | 32.47¢ | 28.15¢ | $190.78 | 587 | 68,062 | 1.1 TWh |
| 2022 | 24.23¢ | 25.46¢ | $150.04 | 619 | 67,997 | 1.2 TWh |
| 2021 | 18.87¢ | 19.85¢ | $120.15 | 637 | 67,643 | 1.2 TWh |
| 2020 | 18.17¢ | 19.04¢ | $115.46 | 636 | 67,173 | 1.2 TWh |
| 2019 | 18.70¢ | 20.05¢ | $112.15 | 600 | 66,586 | 1.2 TWh |
| 2018 | 18.09¢ | 19.69¢ | $115.11 | 636 | 66,133 | 1.2 TWh |
| 2017 | 16.48¢ | 19.20¢ | $98.95 | 601 | 66,168 | 1.2 TWh |
| 2016 | 15.52¢ | 18.38¢ | $92.65 | 597 | 65,781 | 1.2 TWh |
| 2015 | 18.68¢ | 18.50¢ | $115.17 | 617 | 65,265 | 1.2 TWh |
| 2014 | 16.75¢ | 17.53¢ | $107.67 | 643 | 64,921 | 1.2 TWh |
| 2013 | 14.40¢ | 16.33¢ | $94.71 | 658 | 64,654 | 1.2 TWh |
Bundled residential service only in the price, bill and use columns. Bill = residential revenue ÷ customers ÷ 12; use = residential sales ÷ customers ÷ 12.
Month by month
Unitil Energy SystemsNew Hampshire average
Sales by sector, 2024
| Sector | Customers | Sales | Share of sales | Revenue | ¢ per kWh, bundled |
|---|---|---|---|---|---|
| Residential | 68,602 | 495.5 GWh | 43% | $91,714,400 | 23.33¢ |
| Commercial | 12,687 | 332.2 GWh | 29% | $46,734,400 | 23.54¢ |
| Industrial | 163 | 320.5 GWh | 28% | $24,663,600 | 19.55¢ |
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: 510.1 GWh in total, of which 0% was its own net generation and 510.1 GWh was bought wholesale; summer peak demand 287 MW.
Reliability
Minutes of sustained interruption per customer in 2024, as the utility reported them under IEEE 1366 standard. SAIFI: 1.73 interruptions per customer with major event days, 1.00 without; CAIDI 342.6 minutes per interruption. EIA's New Hampshire total across all reporting utilities was 922.7 minutes with major event days and 132.3 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 |
|---|---|---|---|---|---|
| 2024 | 593.4 | 97.7 | 1.73 | 1.00 | IEEE 1366 |
| 2023 | 256.6 | 90.9 | 1.55 | 0.89 | IEEE 1366 |
| 2022 | 275.6 | 70.8 | 1.40 | 0.88 | IEEE 1366 |
| 2021 | 140.9 | 102.8 | 1.33 | 1.04 | IEEE 1366 |
| 2020 | 176.6 | 120.0 | 1.86 | 1.60 | IEEE 1366 |
| 2019 | 210.7 | 82.5 | 1.11 | 0.85 | IEEE 1366 |
| 2018 | 492.7 | 115.8 | 1.94 | 1.20 | IEEE 1366 |
| 2017 | 862.2 | 112.7 | 2.74 | 1.33 | IEEE 1366 |
| 2016 | 160.6 | 101.5 | 1.17 | 0.98 | IEEE 1366 |
| 2015 | 112.7 | 112.7 | 1.58 | 1.58 | IEEE 1366 |
| 2014 | 747.6 | 184.4 | 2.59 | 1.73 | IEEE 1366 |
| 2013 | 235.0 | 119.0 | 1.98 | 1.41 | Other |
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 New Hampshire
| Utility | Ownership | Residential customers | ¢ per kWh | Monthly bill | SAIDI, all events | SAIDI, no major events |
|---|---|---|---|---|---|---|
| Liberty Utilities (Granite State Electri | Investor-owned | 39,667 | 22.87¢ | $149.63 | 370.3 | 92.7 |
| Public Service Co of NH | Investor-owned | 459,907 | 22.65¢ | $136.15 | 786.2 | 81.5 |
| New Hampshire Elec Coop Inc | Cooperative | 74,144 | 23.83¢ | $137.42 | 2,410.2 | 514.9 |
| Community Power Coalition of NH energy only | Community choice | 104,562 | — | — | — | — |
| North American Power and Gas, LLC energy only | Retail power marketer | 38,173 | — | — | — | — |
| Electricity NH, LLC energy only | Retail power marketer | 15,091 | — | — | — | — |
| XOOM Energy New Hampshire, LLC energy only | Retail power marketer | 1,008 | — | — | — | — |
All New Hampshire utilities · Investor-owned utilities nationwide
Questions and answers
How much does electricity cost from Unitil Energy Systems?
Residential customers paid an average of 23.33¢ 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 New Hampshire?
The New Hampshire average residential price in 2024 was 23.40¢ and the US average 16.48¢; Unitil Energy Systems was about the same as the state figure. Among 4 utility filings with a bundled residential price in New Hampshire, it had the 2nd highest.
What is the average Unitil Energy Systems bill?
$143.57 a month in 2024, on average residential use of 615 kWh a month (annual revenue and sales divided by customers and by twelve). The New Hampshire average was $144.87 on 619 kWh.
How reliable is Unitil Energy Systems service?
It reported 593.4 minutes of interruption per customer (SAIDI) including major event days and 97.7 minutes excluding them, with 1.73 interruptions per customer (SAIFI) in 2024. Utilities calculate these under differing methods, so comparisons are approximate.
Is the Unitil Energy Systems price rising?
The average residential price was down 28.1% in 2024 compared with 2023 and up 24.8% compared with 2019.
Which counties does Unitil Energy Systems serve?
Its Form EIA-861 service territory lists 2 counties: Merrimack County, NH and Rockingham County, NH. 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 "Unitil Energy Systems", utility number 24590. 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.