SAIDI
25 min per year
Mean outage duration per year (2023)
What This Utility Data Tells You
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.
SAIFI
0.58 interruptions/yr
Outage frequency (2023)
Customers
62,556
Served in Illinois
SAIDI vs. National Average (180 min) 6.2%
25 outage minutes per customer annually
Power-out minutes per year (2023)
Reliability Trend (2020–2023)
| Year | SAIDI (min) | SAIDI nMED | 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 |
SAIDI nMED = SAIDI without major event days. Source: EIA Form 861.
Service Area
City of Naperville - (IL) serves 2 ZIP codes in Illinois.
6054060563
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
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.
Every figure on PlainUtility is rendered directly from the U.S. Energy Information Administration's Form 861 reliability data, no number is typed in by an editor. This utility's SAIDI/SAIFI figures are rendered directly from EIA Form 861 reliability files. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of 2020-2023.