IOU · Illinois · EIA 4110
Commonwealth Edison Co
IOU · Illinois · 3.2M customers. According to the U.S. Energy Information Administration's EIA Form 861, reliability for 2023 shows SAIDI 93 minutes/customer.
Reliability verdict
Commonwealth Edison Co shows above-average chronic reliability in 2023: 35 minutes SAIDI excluding major events (93 minutes including them) across 3.2M customers.
- 93 min
- SAIDI 2023
- 0.61
- SAIFI 2023
- 35 min
- SAIDI ex-MED
- 3.2M
- 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 Commonwealth Edison Co filings show
Commonwealth Edison Co is an investor-owned utility operating in Illinois under EIA identifier 4110. It reports service to approximately 3,242,491 customer accounts and generated about $4.06 billion in annual electric revenue, with a service footprint spanning 500 ZIP codes. As an investor-owned utility, it operates under state public utility commission oversight that reviews rate cases and reliability performance.
In 2023, the average Commonwealth Edison Co customer experienced 93.3 minutes of power interruptions, a metric called SAIDI (System Average Interruption Duration Index). Excluding major weather events from that total, that places this utility well below the 120–180 minute national benchmark, signaling strong grid hardening and fast restoration practices. Over the same period, SAIFI (outage events per customer) was 0.61, putting the typical customer at roughly 1 distinct interruption that year. Excluding major event days (hurricanes, ice storms), SAIDI drops to 35.0 minutes, the gap between that figure and the headline 93.3 reveals how much weather, not day-to-day infrastructure, drove outages.
The EIA dataset includes 4 years of continuous reporting (2020–2023) for Commonwealth Edison Co, which lets you see whether reliability is trending up or down rather than judging from a single snapshot. SAIDI dropped from 341.1 to 93.3 minutes across that span, a direction regulators and prospective customers tend to watch closely.
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.
93 outage minutes per customer annually
Annual minutes without electric service (2023)
SAIDI by year (2020-2023)
Minutes per customer-year · EIA Form 861
Year-by-year SAIDI for Commonwealth Edison Co from the same EIA filings as the table below. Lower is better; major-event years can spike the headline figure.
Commonwealth Edison Co SAIDI trend
Commonwealth Edison Co vs the nationwide SAIDI distribution
Where this utility's headline SAIDI sits among every EIA Form 861 utility with a reported figure
93 Lower than most fewer outage minutes than 68% 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 Commonwealth Edison Co sits on price vs. reliability
Among the 781 U.S. utilities large enough to report both revenue per customer and a recent outage record, Commonwealth Edison Co charges more per customer than 0% of them, and is more reliable (lower SAIDI) than 71% 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: $1,253/year · Latest SAIDI: 93.3 minutes/year.
SAIDI 2023 breakdown: 93.3 minutes
Reliability Trend (2020–2023)
| Year | SAIDI (min) | SAIDI nMED | SAIFI | Customers |
|---|---|---|---|---|
| 2020 | 341.1 | 40.0 | 0.830 | 4,153,856 |
| 2021 | 101.6 | 43.5 | 0.770 | 4,175,582 |
| 2022 | 65.8 | 37.6 | 0.630 | 4,194,257 |
| 2023 | 93.3 | 35.0 | 0.610 | 4,210,328 |
SAIDI nMED = SAIDI without major event days. Source: EIA Form 861.
Service Area
Commonwealth Edison Co serves 500 ZIP codes in Illinois.
Frequently Asked Questions
How reliable is Commonwealth Edison Co?
Commonwealth Edison Co had a SAIDI of 93.3 minutes in 2023 including major weather events, but 35.0 minutes excluding them (the IEEE-standard measure of day-to-day reliability, the gap reflects a major storm that year, not chronic performance). Excluding major weather events, this is below the national average, indicating above-average reliability.
What type of utility is Commonwealth Edison Co?
Commonwealth Edison Co is classified as a IOU serving Illinois.
How many customers does Commonwealth Edison Co serve?
Commonwealth Edison Co serves approximately 3,242,491 customers in Illinois.
How has Commonwealth Edison Co's reliability changed over time?
Commonwealth Edison Co has 4 years of reliability data (2020-2023). This utility's SAIDI has stayed fairly flat over the period. Review the trend table above for year-by-year detail.
Utility Profile
- Type
- IOU
- State
- Illinois
- Customers
- 3,242,491
- Annual Revenue
- $4.06B
- EIA ID
- 4110
Explore
Utilities with similar EIA profiles
Two cross-state peer sets for Commonwealth Edison Co. 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 (3.2M here), outside Illinois.
Similar chronic SAIDI
Nearest utilities by latest SAIDI minutes (93.3 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.