County annual report · FIPS 17017
2018 Cass County, IL Power Outage Report
In 2018, customers in Cass County, IL went without power for an average of 1.0 hours, a total of 5,843 customer-hours (Illinois average 2.5 hours). That ranks 88th worst of 102 Illinois counties and 2323rd of 2,798 nationally.
Compared with IL, the US and 2017
Coverage line is EAGLE-I's share of Illinois customers tracked each year.
Biggest outages in Cass County, 2018
The 10 outage episodes with the most customers out at once. Times are UTC.
| # | Started (UTC) | Ended (UTC) | Duration | Peak out | Customer-hours |
|---|---|---|---|---|---|
| 1 | December 1, 2018 21:45 | December 2, 2018 17:45 | 20h | 1,631 | 2,564 |
| 2 | August 29, 2018 15:30 | August 29, 2018 19:00 | 3h 30m | 1,229 | 1,173 |
| 3 | May 3, 2018 18:15 | May 3, 2018 20:30 | 2h 15m | 336 | 421 |
| 4 | April 24, 2018 15:15 | April 24, 2018 16:30 | 1h 15m | 85 | 56 |
| 5 | February 18, 2018 23:00 | February 19, 2018 01:30 | 2h 30m | 47 | 114 |
| 6 | June 28, 2018 00:15 | June 28, 2018 02:00 | 1h 45m | 45 | 79 |
| 7 | March 16, 2018 18:15 | March 17, 2018 02:00 | 7h 45m | 42 | 281 |
| 8 | October 20, 2018 17:45 | October 20, 2018 21:30 | 3h 45m | 39 | 59 |
| 9 | July 1, 2018 09:00 | July 1, 2018 14:15 | 5h 15m | 32 | 163 |
| 10 | February 21, 2018 16:00 | February 21, 2018 19:00 | 3h | 19 | 47 |
Outage episodes by size in 2018: 3 reached 100+ customers, 2 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 2018, 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 | 2018 | 3.5 hrs | 1.06 | 1.8 hrs | 0.90 |
| Menard Electric Coop | 2018 | 2.9 hrs | 1.75 | 2.9 hrs | 1.75 |
| 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 92% of Illinois's customers in 2018; 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, 2018, 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/2018/illinois/cass-county