County annual report · FIPS 17017
2025 Cass County, IL Power Outage Report
In 2025, customers in Cass County, IL went without power for an average of 1.8 hours, a total of 11K customer-hours (Illinois average 2.5 hours). That ranks 79th worst of 102 Illinois counties and 2504th of 3,000 nationally.
Compared with IL, the US and 2024
Coverage line is EAGLE-I's share of Illinois customers tracked each year.
Biggest outages in Cass County, 2025
The 10 outage episodes with the most customers out at once. Times are UTC.
| # | Started (UTC) | Ended (UTC) | Duration | Peak out | Customer-hours |
|---|---|---|---|---|---|
| 1 | May 9, 2025 07:30 | May 9, 2025 10:15 | 2h 45m | 785 | 1,571 |
| 2 | June 5, 2025 07:15 | June 5, 2025 10:30 | 3h 15m | 785 | 2,551 |
| 3 | December 18, 2025 16:45 | December 18, 2025 19:15 | 2h 30m | 680 | 877 |
| 4 | September 12, 2025 06:15 | September 12, 2025 09:45 | 3h 30m | 659 | 2,210 |
| 5 | June 18, 2025 17:15 | June 18, 2025 20:00 | 2h 45m | 412 | 1,013 |
| 6 | May 27, 2025 09:30 | May 27, 2025 10:30 | 1h | 337 | 265 |
| 7 | April 21, 2025 00:45 | April 21, 2025 20:00 | 19h 15m | 141 | 617 |
| 8 | July 26, 2025 12:15 | July 26, 2025 12:45 | 30m | 136 | 68 |
| 9 | May 14, 2025 18:00 | May 14, 2025 18:15 | 15m | 75 | 19 |
| 10 | November 26, 2025 15:30 | December 1, 2025 13:45 | 4d 22h | 57 | 618 |
Outage episodes by size in 2025: 8 reached 100+ customers, 0 reached 1,000+ customers, 0 reached 10,000+ customers.
Utility reliability filed with the EIA
SAIDI (average outage time per customer) and SAIFI (average interruptions per customer) that utilities serving Cass County reported on EIA Form 861 for 2025, or their most recent earlier filing. Utility-wide figures, not county-specific.
| Utility | EIA year | SAIDI | SAIFI | SAIDI excl. major events | SAIFI excl. major events |
|---|---|---|---|---|---|
| Ameren Illinois Company | 2024 | 3.7 hrs | 1.13 | 2.0 hrs | 0.91 |
| Menard Electric Coop | 2024 | 2.8 hrs | 1.49 | 1.9 hrs | 1.27 |
| Ameren | - | - | - | - | - |
| Illinois Rural Electric Coop | - | - | - | - | - |
About this data
- Outage figures come from DOE/ORNL EAGLE-I, which records customers out by county every 15 minutes. EAGLE-I tracked about n/a of Illinois's customers in 2025; utilities it does not see are not counted.
- Hours per customer = outage customer-minutes ÷ 6,087 customers (ORNL modeled county customer count), including major storm days. It is comparable across counties but is not the SAIDI a utility files.
- An outage event is a continuous stretch with customers out; counts at 100, 1,000 and 10,000+ use its peak.
- Years loaded: 2015–2025. Cass County has data for 2015–2025.
Cite this report
MassOutage (massoutage.com), Cass County, IL annual power outage report, 2025, data as of Oct 3, 2026 02:41 UTC, sources: DOE EAGLE-I (https://eagle-i.doe.gov/); EAGLE-I modeled customer counts (MCC) (https://figshare.com/); EIA Form 861 (utility reliability) (https://www.eia.gov/electricity/data/eia861/). https://massoutage.com/reports/2025/illinois/cass-county