City of Naperville - (IL)
Municipal electric utility · Illinois · #300 of 3,199 U.S. utilities by customers · EIA utility #13208
City of Naperville - (IL) is a municipal electric utility serving 64,025 customers in Illinois. In 2025 it sold 1,231 gigawatt-hours of electricity for $159.64M in revenue, an average realized rate of 12.97¢ per kWh across all customer classes and 14.61¢ per kWh for residential customers. Its reported service territory covers 2 counties. EIA records its activities as: transmission, distribution.
Customers, sales and rates by customer class (2025)
| Class | Customers | Sales (GWh) | Revenue | Avg realized rate | Share of sales |
|---|---|---|---|---|---|
| Residential | 57,225 | 528 | $77.13M | 14.61¢ | |
| Commercial | 6,792 | 603 | $68.62M | 11.39¢ | |
| Industrial | 8 | 100 | $13.90M | 13.84¢ | |
| Total | 64,025 | 1,231 | $159.64M | 12.97¢ |
Average realized rate = revenue divided by sales as reported on EIA Form 861. It blends fixed charges, demand charges and riders into one per-kWh figure; it is not the utility's tariff rate. Estimated residential bill assumes the average residential customer's actual 2025 usage (769 kWh/month).
Five-year trend
| Year | Customers | Sales (GWh) | Revenue | Residential rate |
|---|---|---|---|---|
| 2021 | 61,651 | 1,281 | $149.82M | 13.08¢ |
| 2022 | 62,100 | 1,255 | $144.10M | 13.01¢ |
| 2023 | 62,556 | 1,208 | $139.58M | 12.95¢ |
| 2024 | 62,990 | 1,212 | $142.20M | 12.98¢ |
| 2025 | 64,025 | 1,231 | $159.64M | 14.61¢ |
Reliability (2025)
Average outage time (SAIDI): 20 minutes per customer per year
Average outages (SAIFI): 0.27 per customer
Average restoration time (CAIDI): 75 minutes
As reported for Illinois under the IEEE standard, with major event days included where the standard reports them. Lower is better; see the reliability rankings.
Energy supply (2025)
Net generation: — GWh
Wholesale power purchased: 1,288 GWh
Winter peak demand: 206 MW
Energy losses: 4.1% of energy handled
Meters & rooftop solar (2025)
Smart (AMI) meters: 100.0% of 64,025 meters
Customer-sited generation (net metering): 1,272 installations, 12.8 MW of capacity
Counties served
DuPage, ILWill, IL
Other large utilities in Illinois
- Commonwealth Edison Co - 3,261,563 customers, residential 17.71¢
- Ameren Illinois Company - 663,709 customers, residential 16.70¢
- MC Squared Energy Services, LLC - 293,923 customers, residential 8.14¢
- Homefield Energy - 160,102 customers, residential 10.64¢
- Energy Services Providers, Inc - 90,477 customers, residential 13.01¢
- Just Energy Solutions Inc. - 80,538 customers, residential 11.33¢
- City of Springfield - (IL) - 70,871 customers, residential 13.09¢
- Residents Energy, LLC - 69,834 customers, residential 17.34¢
All Illinois utilities and rates
Source: U.S. Energy Information Administration, Form EIA-861 2025 (filed by the utility; figures as published). Utility #13208 in the EIA frame.