States › Massachusetts › Nantucket Electric Co
investor-owned utility · EIA utility 13206
Nantucket Electric Co
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.
Nantucket Electric Co serves 12,823 residential customers in Massachusetts as an investor-owned utility, according to its 2024 Form EIA-861 filing, with a service territory that touches 1 county.
Its average residential price that year was 35.11¢ per kilowatthour, 20% above the Massachusetts average of 29.35¢ and 113% 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 $282.90 a month on average use of 806 kWh a month. Across Massachusetts the average bill was $167.20 on 570 kWh, so a bill gap reflects how much power households use as well as what each kilowatthour costs.
The price covers the 2,055 residential customers on bundled service. A further 10,768 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 138.2 minutes per customer with major event days included and 50.4 minutes with them excluded, calculated under IEEE 1366 standard. The median among Massachusetts utilities reporting was 53.8 minutes with major event days; this utility's figure is 157% above that median.
The average price is up 41.7% on 2019, against up 33.9% for Massachusetts as a whole, and down 6.1% on 2023. EIA's early release for 2025, which has not been fully edited, shows 35.91¢.
Compared with Massachusetts, the US and other investor-owned utilities
| Measure, 2024 | This utility | Investor-owned utilities, US median | Massachusetts | United States |
|---|---|---|---|---|
| Average residential price per kWh | 35.11¢ | 16.17¢ | 29.35¢ | 16.48¢ |
| Average monthly residential bill | $282.90 | $131.47 | $167.20 | $142.26 |
| Average monthly use, kWh | 806 | 787 | 570 | 863 |
| Residential price change, 1 year | -6.1% | — | -0.9% | +3.0% |
| Residential price change, 5 years | +41.7% | — | +33.9% | +26.7% |
| SAIDI, all events (minutes) | 138.2 | 278.7 | 53.8 median | 184.5 median |
| SAIDI, without major event days | 50.4 | 106.5 | 35.5 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 investor-owned utilities in Massachusetts, the median price was 34.36¢. In Massachusetts this utility's price ranks 2 of 20, counting from the highest.
Average price by year
Nantucket Electric CoMassachusetts averageUS average
Year by year
| Year | ¢ per kWh | Massachusetts ¢ | Monthly bill | kWh a month | Residential customers | All sales |
|---|---|---|---|---|---|---|
| 2025 early release | 35.91¢ | 30.48¢ | $295.26 | 822 | 12,966 | 191.8 GWh |
| 2024 | 35.11¢ | 29.35¢ | $282.90 | 806 | 12,823 | 187.5 GWh |
| 2023 | 37.41¢ | 29.61¢ | $284.86 | 761 | 12,599 | 178.3 GWh |
| 2022 | 29.62¢ | 25.97¢ | $225.55 | 762 | 12,448 | 181.5 GWh |
| 2021 | 25.46¢ | 22.89¢ | $204.08 | 802 | 12,309 | 179.7 GWh |
| 2020 | 24.51¢ | 21.97¢ | $201.71 | 823 | 12,062 | 171.3 GWh |
| 2019 | 24.78¢ | 21.92¢ | $184.35 | 744 | 12,045 | 171.9 GWh |
| 2018 | 24.04¢ | 21.61¢ | $173.11 | 720 | 11,943 | 172.2 GWh |
| 2017 | 24.27¢ | 20.06¢ | $127.95 | 527 | 11,761 | 155.4 GWh |
| 2016 | 19.94¢ | 19.00¢ | $150.09 | 753 | 11,659 | 161.7 GWh |
| 2015 | 22.23¢ | 19.83¢ | $170.01 | 765 | 11,539 | 163.2 GWh |
| 2014 | 19.11¢ | 17.39¢ | $141.82 | 742 | 11,443 | 155.6 GWh |
| 2013 | 15.01¢ | 15.83¢ | $111.10 | 740 | 11,387 | 151.2 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
Nantucket Electric CoMassachusetts average
Sales by sector, 2024
| Sector | Customers | Sales | Share of sales | Revenue | ¢ per kWh, bundled |
|---|---|---|---|---|---|
| Residential | 12,823 | 130 GWh | 69% | $26,889,700 | 35.11¢ |
| Commercial | 1,717 | 56.9 GWh | 30% | $7,534,900 | 30.14¢ |
| Industrial | 4 | 596 MWh | 0% | $73,600 | 30.40¢ |
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: 23.4 GWh in total, of which 0% was its own net generation and 23.4 GWh was bought wholesale; summer peak demand 56 MW.
Reliability
Minutes of sustained interruption per customer in 2024, as the utility reported them under IEEE 1366 standard. SAIFI: 0.72 interruptions per customer with major event days, 0.33 without; CAIDI 192.2 minutes per interruption. EIA's Massachusetts total across all reporting utilities was 102.0 minutes with major event days and 76.1 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 | 102.6 | 102.6 | 0.97 | 0.97 | IEEE 1366 |
| 2024 | 138.2 | 50.4 | 0.72 | 0.33 | IEEE 1366 |
| 2023 | 44.5 | 44.5 | 0.30 | 0.30 | IEEE 1366 |
| 2022 | 601.8 | 105.5 | 2.14 | 1.11 | IEEE 1366 |
| 2021 | 73.4 | 56.1 | 0.62 | 0.54 | IEEE 1366 |
| 2020 | 70.6 | 29.4 | 0.81 | 0.21 | Other |
| 2019 | 28.3 | 26.3 | 0.27 | 0.24 | Other |
| 2018 | 77.7 | 18.9 | 0.53 | 0.16 | Other |
| 2017 | 85.5 | 85.5 | 0.71 | 0.71 | Other |
| 2016 | 134.6 | 56.9 | 1.35 | 0.43 | Other |
| 2015 | 1,406.9 | 33.6 | 2.43 | 0.43 | Other |
| 2014 | 170.4 | 62.8 | 1.50 | 0.73 | IEEE 1366 |
| 2013 | 198.5 | 54.6 | 1.02 | 0.62 | 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 Massachusetts
| Utility | Ownership | Residential customers | ¢ per kWh | Monthly bill | SAIDI, all events | SAIDI, no major events |
|---|---|---|---|---|---|---|
| Fitchburg Gas & Elec Light Co mostly delivery | Investor-owned | 26,290 | 40.08¢ | $201.83 | 64.6 | 64.6 |
| Massachusetts Electric Co mostly delivery | Investor-owned | 1,210,113 | 33.60¢ | $165.44 | 133.7 | 90.7 |
| NSTAR Electric Company mostly delivery | Investor-owned | 1,303,076 | 29.91¢ | $137.02 | 80.6 | 66.1 |
| Town of North Attleborough | Municipal | 12,607 | 15.91¢ | $121.16 | 5.9 | 5.9 |
| City of Norwood | Municipal | 13,601 | 17.67¢ | $97.52 | 64.1 | 24.8 |
| Town of Braintree | Municipal | 14,039 | 15.79¢ | $111.59 | 2.5 | 2.5 |
| Town of Danvers | Municipal | 11,594 | 16.45¢ | $114.03 | 18.0 | 18.0 |
| Discount Power Inc energy only | Retail power marketer | 11,464 | — | — | — | — |
All Massachusetts utilities · Investor-owned utilities nationwide
Questions and answers
How much does electricity cost from Nantucket Electric Co?
Residential customers paid an average of 35.11¢ 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 Massachusetts?
The Massachusetts average residential price in 2024 was 29.35¢ and the US average 16.48¢; Nantucket Electric Co was 20% above the state figure. Among 20 utility filings with a bundled residential price in Massachusetts, it had the 2nd highest.
What is the average Nantucket Electric Co bill?
$282.90 a month in 2024, on average residential use of 806 kWh a month (annual revenue and sales divided by customers and by twelve). The Massachusetts average was $167.20 on 570 kWh.
How reliable is Nantucket Electric Co service?
It reported 138.2 minutes of interruption per customer (SAIDI) including major event days and 50.4 minutes excluding them, with 0.72 interruptions per customer (SAIFI) in 2024. Utilities calculate these under differing methods, so comparisons are approximate.
Is the Nantucket Electric Co price rising?
The average residential price was down 6.1% in 2024 compared with 2023 and up 41.7% compared with 2019. EIA's early, not fully edited release for 2025 shows 35.91¢.
Which counties does Nantucket Electric Co serve?
Its Form EIA-861 service territory lists 1 county: Nantucket County, MA. 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 "Nantucket Electric Co", utility number 13206; 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 30 Sep 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.