County annual report · FIPS 08059
2021 Jefferson County, CO Power Outage Report
In 2021, customers in Jefferson County, CO went without power for an average of 3.5 hours, a total of 975K customer-hours (Colorado average 2.8 hours). That ranks 19th worst of 52 Colorado counties and 1680th of 2,974 nationally.
Compared with CO, the US and 2020
Coverage line is EAGLE-I's share of Colorado customers tracked each year.
Biggest outages in Jefferson County, 2021
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 15, 2021 09:30 | December 20, 2021 13:30 | 5d 4h | 26,543 | 307K |
| 2 | December 30, 2021 12:30 | December 31, 2021 00:15 | 11h 45m | 25,418 | 81K |
| 3 | March 14, 2021 11:30 | March 17, 2021 01:15 | 2d 13h | 14,606 | 25K |
| 4 | July 22, 2021 11:45 | July 24, 2021 13:30 | 2d 1h | 10,596 | 6,178 |
| 5 | July 6, 2021 14:00 | July 9, 2021 10:15 | 2d 20h | 7,087 | 22K |
| 6 | April 19, 2021 13:15 | April 21, 2021 12:30 | 1d 23h | 4,724 | 4,818 |
| 7 | October 21, 2021 13:15 | October 22, 2021 13:45 | 1d | 4,673 | 16K |
| 8 | April 15, 2021 13:00 | April 17, 2021 10:45 | 1d 21h | 4,647 | 36K |
| 9 | May 17, 2021 14:00 | May 18, 2021 06:30 | 16h 30m | 4,628 | 4,108 |
| 10 | August 30, 2021 16:15 | August 31, 2021 13:15 | 21h | 4,620 | 10K |
Outage episodes by size in 2021: 203 reached 100+ customers, 68 reached 1,000+ customers, 4 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 Jefferson County reported on EIA Form 861 for 2021, 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 |
|---|---|---|---|---|---|
| Public Service Co of Colorado | 2021 | 3.0 hrs | 1.20 | 2.2 hrs | 1.00 |
| CORE Electric Cooperative | 2021 | 2.7 hrs | 0.91 | 46 min | 0.54 |
| United Power, Inc | 2021 | 85 min | 0.80 | 68 min | - |
| WAPA-- Western Area Power Administration | - | - | - | - | - |
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 Colorado's customers in 2021; utilities it does not see are not counted.
- Hours per customer = outage customer-minutes ÷ 278,207 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. Jefferson County has data for 2015–2025.
Cite this report
MassOutage (massoutage.com), Jefferson County, CO annual power outage report, 2021, 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/2021/colorado/jefferson-county