County annual report · FIPS 55105
2018 Rock County, WI Power Outage Report
In 2018, customers in Rock County, WI went without power for an average of 1.4 hours, a total of 80K customer-hours (Wisconsin average 1.7 hours). That ranks 41st worst of 71 Wisconsin counties and 2130th of 2,798 nationally.
Compared with WI, the US and 2017
Coverage line is EAGLE-I's share of Wisconsin customers tracked each year.
Biggest outages in Rock 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 | August 24, 2018 09:30 | August 24, 2018 14:30 | 5h | 3,389 | 9,292 |
| 2 | October 20, 2018 15:30 | October 21, 2018 08:15 | 16h 45m | 2,656 | 14K |
| 3 | September 11, 2018 10:45 | September 11, 2018 19:15 | 8h 30m | 2,654 | 7,899 |
| 4 | June 8, 2018 15:30 | June 8, 2018 18:00 | 2h 30m | 1,872 | 1,504 |
| 5 | August 22, 2018 13:45 | August 22, 2018 22:45 | 9h | 1,454 | 1,909 |
| 6 | August 17, 2018 00:15 | August 17, 2018 02:00 | 1h 45m | 1,391 | 1,519 |
| 7 | October 6, 2018 02:30 | October 6, 2018 08:00 | 5h 30m | 936 | 2,341 |
| 8 | October 3, 2018 12:45 | October 4, 2018 02:30 | 13h 45m | 786 | 1,798 |
| 9 | July 28, 2018 23:45 | July 29, 2018 01:15 | 1h 30m | 750 | 381 |
| 10 | July 20, 2018 04:00 | July 20, 2018 07:00 | 3h | 743 | 612 |
Outage episodes by size in 2018: 60 reached 100+ customers, 6 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 Rock 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 |
|---|---|---|---|---|---|
| Wisconsin Electric Power Co | 2018 | 2.0 hrs | 0.73 | 70 min | 0.59 |
| City of Stoughton - (WI) | 2018 | 4.0 hrs | 1.10 | 51 min | 0.65 |
| Alliant Energy (Interstate Power & Light) | - | - | - | - | - |
| Wisconsin Power & Light Co | - | - | - | - | - |
| Rock Energy Cooperative | - | - | - | - | - |
| Brodhead Water & Lighting Comm | - | - | - | - | - |
| City of Evansville | - | - | - | - | - |
About this data
- Outage figures come from DOE/ORNL EAGLE-I, which records customers out by county every 15 minutes. EAGLE-I tracked about 83% of Wisconsin's customers in 2018; utilities it does not see are not counted.
- Hours per customer = outage customer-minutes ÷ 56,401 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. Rock County has data for 2015–2025.
Cite this report
MassOutage (massoutage.com), Rock County, WI 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/wisconsin/rock-county