States › Illinois › City of Naperville
municipal utility · EIA utility 13208
City of Naperville
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.
City of Naperville is a municipal utility that reported 56,117 residential customers in Illinois on Form EIA-861 for 2024, with a service territory that touches 2 counties.
Its average residential price that year was 12.98¢ per kilowatthour, 18% below the Illinois average of 15.87¢ and 21% below 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 $98.85 a month on average use of 762 kWh a month. Across Illinois the average bill was $109.99 on 693 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 24.8 minutes per customer with major event days included, calculated under IEEE 1366 standard. The median among Illinois utilities reporting was 131.9 minutes with major event days; this utility's figure is 81% below that median.
The average price is down 1.7% on 2019, against up 21.8% for Illinois as a whole, and little changed on 2023. EIA's early release for 2025, which has not been fully edited, shows 14.61¢.
Compared with Illinois, the US and other municipal utilities
| Measure, 2024 | This utility | Municipal utilities, US median | Illinois | United States |
|---|---|---|---|---|
| Average residential price per kWh | 12.98¢ | 12.45¢ | 15.87¢ | 16.48¢ |
| Average monthly residential bill | $98.85 | $113.02 | $109.99 | $142.26 |
| Average monthly use, kWh | 762 | 905 | 693 | 863 |
| Residential price change, 1 year | +0.2% | — | +1.0% | +3.0% |
| Residential price change, 5 years | -1.7% | — | +21.8% | +26.7% |
| SAIDI, all events (minutes) | 24.8 | 64.4 | 131.9 median | 184.5 median |
| SAIDI, without major event days | — | 40.3 | 85.0 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 7 filings by municipal utilities in Illinois, the median price was 12.98¢. In Illinois this utility's price ranks 20 of 24, counting from the highest.
Average price by year
City of NapervilleIllinois averageUS average
Year by year
| Year | ¢ per kWh | Illinois ¢ | Monthly bill | kWh a month | Residential customers | All sales |
|---|---|---|---|---|---|---|
| 2025 early release | 14.61¢ | 17.69¢ | $112.32 | 769 | 57,225 | 1.2 TWh |
| 2024 | 12.98¢ | 15.87¢ | $98.85 | 762 | 56,117 | 1.2 TWh |
| 2023 | 12.95¢ | 15.71¢ | $97.19 | 750 | 55,563 | 1.2 TWh |
| 2022 | 13.01¢ | 15.65¢ | $101.40 | 779 | 55,329 | 1.3 TWh |
| 2021 | 13.08¢ | 13.18¢ | $106.87 | 817 | 54,868 | 1.3 TWh |
| 2020 | 13.42¢ | 13.04¢ | $107.81 | 804 | 54,483 | 1.3 TWh |
| 2019 | 13.21¢ | 13.03¢ | $101.62 | 770 | 54,231 | 1.3 TWh |
| 2018 | 13.55¢ | 12.77¢ | $112.05 | 827 | 53,274 | 1.3 TWh |
| 2017 | 13.05¢ | 12.95¢ | $102.96 | 789 | 53,060 | 1.3 TWh |
| 2016 | 12.21¢ | 12.54¢ | $103.02 | 844 | 52,824 | 1.4 TWh |
| 2015 | 11.17¢ | 12.50¢ | $89.84 | 804 | 52,627 | 1.3 TWh |
| 2014 | 10.67¢ | 11.91¢ | $90.74 | 850 | 52,411 | 1.4 TWh |
| 2013 | 10.69¢ | 10.63¢ | $90.54 | 847 | 51,758 | 1.4 TWh |
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.
Sales by sector, 2024
| Sector | Customers | Sales | Share of sales | Revenue | ¢ per kWh, bundled |
|---|---|---|---|---|---|
| Residential | 56,117 | 512.9 GWh | 42% | $66,567,100 | 12.98¢ |
| Commercial | 6,865 | 609.7 GWh | 50% | $66,085,000 | 10.84¢ |
| Industrial | 8 | 89.5 GWh | 7% | $9,547,700 | 10.67¢ |
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: 1.3 TWh in total, of which 0% was its own net generation and 1.3 TWh was bought wholesale; summer peak demand 347 MW.
Reliability
Minutes of sustained interruption per customer in 2024, as the utility reported them under IEEE 1366 standard. SAIFI: 0.50 interruptions per customer with major event days; CAIDI 49.7 minutes per interruption. EIA's Illinois total across all reporting utilities was 156.9 minutes with major event days and 59.4 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 | 20.1 | — | 0.27 | — | IEEE 1366 |
| 2024 | 24.8 | — | 0.50 | — | IEEE 1366 |
| 2023 | 24.9 | — | 0.58 | — | IEEE 1366 |
| 2022 | 16.6 | — | 0.30 | — | IEEE 1366 |
| 2021 | 20.3 | — | 0.30 | — | IEEE 1366 |
| 2020 | 13.9 | — | 0.22 | — | IEEE 1366 |
| 2019 | 16.4 | — | 0.40 | — | IEEE 1366 |
| 2018 | 19.4 | — | 0.47 | — | IEEE 1366 |
| 2017 | 22.2 | — | 0.34 | — | IEEE 1366 |
| 2016 | 18.6 | — | 0.34 | — | IEEE 1366 |
| 2015 | 20.9 | — | 0.42 | — | IEEE 1366 |
| 2014 | 15.0 | — | 0.22 | — | IEEE 1366 |
| 2013 | 36.0 | — | 0.35 | — | 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 Illinois
| Utility | Ownership | Residential customers | ¢ per kWh | Monthly bill | SAIDI, all events | SAIDI, no major events |
|---|---|---|---|---|---|---|
| City of Springfield | Municipal | 59,621 | 11.95¢ | $99.19 | 83.2 | 83.2 |
| City of St Charles | Municipal | 14,181 | 15.37¢ | $102.65 | 76.6 | 60.2 |
| City of Batavia | Municipal | 10,020 | 14.08¢ | $102.54 | 46.5 | 40.6 |
| City of Geneva | Municipal | 8,691 | 11.03¢ | $85.20 | 196.5 | 83.2 |
| Rochelle Municipal Utilities | Municipal | 5,854 | 13.22¢ | $87.69 | 22.4 | — |
| City of Peru | Municipal | 4,993 | 12.00¢ | $74.95 | — | — |
| Corn Belt Energy Corporation | Cooperative | 34,710 | 15.76¢ | $144.08 | 311.6 | 152.0 |
| Southwestern Electric Coop Inc | Cooperative | 24,822 | 13.68¢ | $153.82 | 304.8 | 263.0 |
All Illinois utilities · Municipal utilities nationwide
Questions and answers
How much does electricity cost from City of Naperville?
Residential customers paid an average of 12.98¢ 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 Illinois?
The Illinois average residential price in 2024 was 15.87¢ and the US average 16.48¢; City of Naperville was 18% below the state figure. Among 24 utility filings with a bundled residential price in Illinois, it had the 20th highest.
What is the average City of Naperville bill?
$98.85 a month in 2024, on average residential use of 762 kWh a month (annual revenue and sales divided by customers and by twelve). The Illinois average was $109.99 on 693 kWh.
How reliable is City of Naperville service?
It reported 24.8 minutes of interruption per customer (SAIDI) including major event days, with 0.50 interruptions per customer (SAIFI) in 2024. Utilities calculate these under differing methods, so comparisons are approximate.
Is the City of Naperville price rising?
The average residential price was little changed in 2024 compared with 2023 and down 1.7% compared with 2019. EIA's early, not fully edited release for 2025 shows 14.61¢.
Which counties does City of Naperville serve?
Its Form EIA-861 service territory lists 2 counties: DuPage County, IL and Will County, IL. 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 "City of Naperville - (IL)", utility number 13208; the 2025 row is from EIA's early release. 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.