County annual report · FIPS 08013
2021 Boulder County, CO Power Outage Report
In 2021, customers in Boulder County, CO went without power for an average of 2.8 hours, a total of 470K customer-hours (Colorado average 2.8 hours). That ranks 23rd worst of 52 Colorado counties and 1918th 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 Boulder 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 30, 2021 15:15 | December 31, 2021 00:15 | 9h | 29,693 | 131K |
| 2 | December 15, 2021 09:15 | December 18, 2021 01:45 | 2d 16h | 11,600 | 123K |
| 3 | March 14, 2021 07:45 | March 16, 2021 04:30 | 1d 20h | 7,374 | 27K |
| 4 | September 9, 2021 05:15 | September 9, 2021 10:00 | 4h 45m | 4,294 | 20K |
| 5 | March 25, 2021 15:15 | March 26, 2021 18:30 | 1d 3h | 3,791 | 5,625 |
| 6 | December 2, 2021 03:30 | December 2, 2021 06:30 | 3h | 3,685 | 1,353 |
| 7 | December 10, 2021 18:15 | December 10, 2021 20:30 | 2h 15m | 3,585 | 931 |
| 8 | October 24, 2021 18:45 | October 24, 2021 22:00 | 3h 15m | 3,149 | 801 |
| 9 | January 19, 2021 15:15 | January 19, 2021 19:00 | 3h 45m | 2,536 | 659 |
| 10 | July 22, 2021 16:00 | July 22, 2021 23:15 | 7h 15m | 2,006 | 706 |
Outage episodes by size in 2021: 153 reached 100+ customers, 32 reached 1,000+ customers, 2 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 Boulder 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 |
| United Power, Inc | 2021 | 85 min | 0.80 | 68 min | - |
| Poudre Valley REA, Inc | 2021 | 5.5 hrs | 1.57 | 77 min | 0.84 |
| WAPA-- Western Area Power Administration | - | - | - | - | - |
| City of Longmont | - | - | - | - | - |
| Town of Estes Park | - | - | - | - | - |
| Town of Lyons - (CO) | - | - | - | - | - |
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 ÷ 166,613 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. Boulder County has data for 2015–2025.
Cite this report
MassOutage (massoutage.com), Boulder 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/boulder-county