Power Outages in Williamson County, IL
Ameren Illinois Company, Egyptian Electric Coop Assn and Southeastern IL Elec Coop, Inc publish only a system-wide total, not county figures. There is no live feed for Ameren and Southern Illinois Elec Coop. In 2025, the average customer here lost power for about 14.6 hours.
Williamson County, IL is served by 5 tracked utilities.
Cite this data
- URL
- https://massoutage.com/illinois/williamson-county
- As of
- Not available
- Publisher
- MassOutage
MassOutage, "Power Outages in Williamson County, IL". https://massoutage.com/illinois/williamson-county
Ameren Illinois Company, Egyptian Electric Coop Assn and Southeastern IL Elec Coop, Inc publish no county-level figures.
No live feed for Ameren and Southern Illinois Elec Coop: outages in theirservice area won't show here.
0.0%of this county's ~49,886 customers are served by utilities with a county-level live feed.
We can't see outages for: Ameren, Southern Illinois Elec Coop. Their customers are not in any number on this page; check their own outage maps.
System-wide total only, no county split: Ameren Illinois Company, Egyptian Electric Coop Assn, Southeastern IL Elec Coop, Inc.
| Utility | Feed | Out | Served | % out | Small outages | Incidents | Utility ETR | As of |
|---|---|---|---|---|---|---|---|---|
| Ameren Illinois Company | Live · total only | not by county | - | - | - | - | - | - |
| Egyptian Electric Coop Assn | Live · total only | not by county | - | - | - | - | - | - |
| Southeastern IL Elec Coop, Inc | Live · total only | not by county | - | - | - | - | - | - |
| Ameren | No live feed | can't see | - | - | - | - | - | - |
| Southern Illinois Elec Coop | No live feed | can't see | - | - | - | - | - | - |
Electricity-dependent residents
HHS emPOWER · data October 7, 2026Medicare beneficiaries in Williamson Countywho rely on electricity-dependent medical equipment (ventilators, oxygen concentrators, home dialysis, powered wheelchairs, and more). HHS reports counts of 1–10 as “≤11”. Medicare only, so the full at-risk population is larger.
By ZIP code (12)
| ZIP | Power-dependent | Ventilators | O2 concentrators | Home dialysis |
|---|---|---|---|---|
| 62959 | 366 | 39 | 285 | ≤11 |
| 62948 | 208 | 20 | 170 | ≤11 |
| 62918 | 108 | 12 | 83 | ≤11 |
| 62951 | 100 | 14 | 84 | ≤11 |
| 62902 | 47 | ≤11 | 39 | 0 |
| 62922 | 35 | ≤11 | 28 | 0 |
| 62933 | 28 | ≤11 | 26 | 0 |
| 62974 | 24 | ≤11 | 19 | 0 |
| 62949 | 12 | 0 | ≤11 | 0 |
| 62915 | 12 | ≤11 | ≤11 | 0 |
| 62921 | ≤11 | 0 | ≤11 | 0 |
| 62841 | ≤11 | ≤11 | ≤11 | 0 |
Emergency managers can request identified beneficiary lists through their state health department via the HHS emPOWER program.
Outage began, grew, restoration estimate changed, restored: by email, Slack, Teams, Discord or signed webhook, for Williamson County or any town and utility in it.
- Frost AdvisoryMINOR
Williamson County has been under 17 National Weather Service alerts recently, most recently a Frost Advisory on October 18, 2026.
- Heat Advisory ×12
- Special Weather Statement ×3
- Dense Fog Advisory ×1
- Frost Advisory ×1
Latest Williamson County, IL outage updates
A running log of how this outage has changed, updated automatically as utilities report in.
- RESOLVED
Power restored after 10m
- OUTAGE BEGAN
Outage began: 978 customers out (2.7% of the county)
- RESOLVED
Power restored after 1h 35m
- OUTAGE BEGAN
Outage began: 380 customers out (1.1% of the county)
Hardest-hit cities in Williamson County
Where this event is concentrated across the county's towns and townships.
Historical reliability
In 2025, the average customer in Williamson County went about 14.6 hours without power. Peak simultaneous outage on record reached 10,894 customers.
The US EIA reports Illinois utilities averaged 2.4 hrs without power per customer (SAIDI) in 2025, a cross-check on our county estimate of 14.6 hrs.
Worst year here was 2025 (peak 10,894 customers out) · decade average 3.5 hrs without power per customer/yr.
| Year | Outage events | Peak customers out | Avg hrs/customer |
|---|---|---|---|
| 2015 | 491 | 5,033 | 1.1 |
| 2016 | 611 | 5,019 | 1.5 |
| 2017 | 495 | 4,647 | 1.4 |
| 2018 | 759 | 7,504 | 5.1 |
| 2019 | 815 | 7,719 | 3.5 |
| 2020 | 808 | 2,263 | 1.0 |
| 2021 | 789 | 6,630 | 2.0 |
| 2022 | 798 | 4,140 | 1.7 |
| 2023 | 692 | 4,280 | 2.0 |
| 2024 | 723 | 8,670 | 4.1 |
| 2025 | 794 | 10,894 | 14.6 |
Cost of power in Williamson County
ENERGY & AI DEMAND →Estimated residential electricity price for Williamson County, customer-weighted across the utilities serving it (US EIA, 2025). Retail prices aren't published at the county level; this is a derived estimate.
- Ameren Illinois Company16.7¢587,659 cust
- Southeastern IL Elec Coop, Inc14.8¢22,607 cust
- Egyptian Electric Coop Assn16.2¢13,695 cust
Weighted by each utility's residential customer count (utilities report customers at the state level; a per-county share isn't published). Rising retail prices track a national demand surge; see energy & the data-center boom.
Very High high winds exposure · 3.5 hrs/yr of outages over the last decade.
FEMA rates this county’s social vulnerability relatively moderate: outages hit harder where communities are less able to respond and recover.
All hazard rankings →Power outages in Williamson County: FAQ
- How often does Williamson County, IL lose power?
- Based on EAGLE-I records, Williamson County, IL logged 794 distinct outage events in 2025, averaging about 14.6 hours without power per customer over the year.
- What was the worst power outage in Williamson County, IL?
- The largest tracked outage peaked at 10,894 customers without power, beginning January 5, 2025 and lasting about 6d 15h.
- Is there a power outage in Williamson County, IL right now?
- No major outage is currently reported for Williamson County, IL. Live coverage depends on whether local utilities report to ODIN.
- Which utilities serve Williamson County, IL?
- Tracked electric providers include Ameren, Ameren Illinois Company, Egyptian Electric Coop Assn, Southeastern IL Elec Coop, Inc.
Outages are tracked at the county level; these ZIP codes fall within Williamson County.
62841, 62902, 62915, 62918, 62921, 62922, 62933, 62948, 62949, 62951, 62959, 62974
Electric providers serving this county
From EIA-861 service territory, with official reliability where reported.
| Provider | Official SAIDI (EIA) | Live | Report outage |
|---|---|---|---|
| Ameren Illinois Company | 4.8 hrs | Live · total only | - |
| Southeastern IL Elec Coop, Inc | 36.9 hrs | Live · total only | - |
| Egyptian Electric Coop Assn | 12.9 hrs | Live · total only | - |
| Ameren | - | No live feed | - |
| Southern Illinois Elec Coop | - | No live feed | - |
Data from DOE/ORNL ODIN, DOE EAGLE-I, EIA Form 861 (utility reliability), EIA electricity retail prices and FEMA National Risk Index, every source we read. Historical figures derive from the DOE/ORNL EAGLE-I dataset (EAGLE-I tracked roughly 0% of Illinois customers). Machine-readable data: /api/v1/counties/17199 and /api/v1/counties/17199/history.