Municipal · Illinois · EIA 13208
City of Naperville - (IL)
Municipal · Illinois · 63K customers. According to the U.S. Energy Information Administration's EIA Form 861, reliability for 2023 shows SAIDI 25 minutes/customer.
Reliability verdict
City of Naperville - (IL) shows above-average chronic reliability in 2023: 25 minutes SAIDI across 63K customers.
- 25 min
- SAIDI 2023
- 0.58
- SAIFI 2023
- 63K
- Customers
Chronic reliability judged on SAIDI excluding major event days when reported (IEEE 1366). Source: EIA Form 861 · August 2026.
Signature read: short interruption minutes vs the 911 utility cohort (≤96 min tercile cut).
What short-outage City of Naperville - (IL) filings show
City of Naperville - (IL) is a municipally-owned utility operating in Illinois under EIA identifier 13208. It reports service to approximately 62,556 customer accounts and generated about $0.14 billion in annual electric revenue, with a service footprint spanning 2 ZIP codes. Being municipally owned, the utility answers to a local board or city council rather than a state commission, and carries a federal income tax exemption.
In 2023, the average City of Naperville - (IL) customer experienced 24.9 minutes of power interruptions, a metric called SAIDI (System Average Interruption Duration Index). That places this utility well below the 120–180 minute national benchmark, signaling strong grid hardening and fast restoration practices. The SAIFI figure, which tracks average outage events per customer, came in at 0.58 for the same period, meaning customers statistically saw about 1 distinct interruption that year.
The EIA dataset includes 4 years of continuous reporting (2020–2023) for City of Naperville - (IL), which lets you see whether reliability is trending up or down rather than judging from a single snapshot. SAIDI has increased from 13.9 to 24.9 minutes, which may reflect either worsening weather exposure or delayed grid modernization.
Based on this utility's own EIA Form 861 reliability record -- baseline (major-event- excluded) outage duration, total outage duration, and outage frequency -- each benchmarked against every reporting utility nationwide. Not a measure of electricity rates or customer service, which this portal does not track.
25 outage minutes per customer annually
Power-out minutes per year (2023)
SAIDI by year (2020-2023)
Minutes per customer-year · EIA Form 861
Year-by-year SAIDI for City of Naperville - (IL) from the same EIA filings as the table below. Lower is better; major-event years can spike the headline figure.
City of Naperville - (IL) SAIDI trend
City of Naperville - (IL) vs the nationwide SAIDI distribution
Where this utility's headline SAIDI sits among every EIA Form 861 utility with a reported figure
25 Among the lowest fewer outage minutes than 92% of 911 utilities
Utilities nationwide, banded by latest reported SAIDI (minutes)
Each bar is a band; taller bars hold more utilities. The dashed line + filled bar mark this entry. Hover or tap any bar for its full count and share, and where it sits relative to this entry.
Source U.S. EIA Form 861 reliability filings · August 2026
Price vs. reliability
Where City of Naperville - (IL) sits on price vs. reliability
Among the 781 U.S. utilities large enough to report both revenue per customer and a recent outage record, City of Naperville - (IL) charges more per customer than 30% of them, and is more reliable (lower SAIDI) than 94% of them, placing it in the quadrant where it pays less while still being more reliable, the best-value quadrant. Revenue per customer and outage minutes are independent figures: paying more does not guarantee fewer outages.
Revenue per customer: $2,231/year · Latest SAIDI: 24.9 minutes/year.
Reliability Trend (2020–2023)
| Year | SAIDI (min) | SAIFI | Customers |
|---|---|---|---|
| 2020 | 13.9 | 0.220 | 61,072 |
| 2021 | 20.3 | 0.300 | 61,651 |
| 2022 | 16.6 | 0.300 | 62,212 |
| 2023 | 24.9 | 0.580 | 62,556 |
Service Area
City of Naperville - (IL) serves 2 ZIP codes in Illinois.
Frequently Asked Questions
How reliable is City of Naperville - (IL)?
City of Naperville - (IL) had a SAIDI of 24.9 minutes in 2023. Excluding major storm impacts, this beats the national average, a sign of above-average reliability.
What type of utility is City of Naperville - (IL)?
City of Naperville - (IL) is classified as a Municipal serving Illinois.
How many customers does City of Naperville - (IL) serve?
City of Naperville - (IL) serves approximately 62,556 customers in Illinois.
How has City of Naperville - (IL)'s reliability changed over time?
City of Naperville - (IL) has 4 years of reliability data (2020-2023). SAIDI has remained relatively stable over this period. Review the trend table above for year-by-year detail.
Utility Profile
- Type
- Municipal
- State
- Illinois
- Customers
- 62,556
- Annual Revenue
- $0.14B
- EIA ID
- 13208
Explore
Utilities with similar EIA profiles
Two cross-state peer sets for City of Naperville - (IL). Same-state SAIDI neighbors stay in Read-with below; these neighborhoods are nearest other-state utilities with at least 10,000 reported customers.
Similar customer count
Nearest utilities by Form 861 customers (63K here), outside Illinois.
Similar chronic SAIDI
Nearest utilities by latest SAIDI minutes (24.9 here), outside Illinois, excluding the customer-peer set.
Source: U.S. Energy Information Administration Form 861 annual electric power industry survey · ZIP service territory: OpenEI. Disclaimer: informational only, not professional advice. See full disclaimer · methodology.