County annual report · FIPS 08005
2021 Arapahoe County, CO Power Outage Report
In 2021, customers in Arapahoe County, CO went without power for an average of 1.5 hours, a total of 485K customer-hours (Colorado average 2.8 hours). That ranks 38th worst of 52 Colorado counties and 2468th 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 Arapahoe 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 | September 11, 2021 19:45 | September 17, 2021 00:30 | 5d 4h | 11,280 | 19K |
| 2 | December 15, 2021 15:30 | December 17, 2021 05:45 | 1d 14h | 6,288 | 55K |
| 3 | October 12, 2021 08:15 | October 12, 2021 12:15 | 4h | 5,510 | 4,271 |
| 4 | July 30, 2021 22:45 | July 31, 2021 12:15 | 13h 30m | 4,922 | 2,608 |
| 5 | June 29, 2021 14:45 | June 30, 2021 00:30 | 9h 45m | 4,736 | 6,365 |
| 6 | October 18, 2021 11:15 | October 19, 2021 11:45 | 1d | 3,774 | 15K |
| 7 | February 9, 2021 15:45 | February 9, 2021 23:00 | 7h 15m | 3,753 | 4,947 |
| 8 | May 9, 2021 23:00 | May 11, 2021 12:30 | 1d 13h | 3,731 | 5,251 |
| 9 | July 27, 2021 12:45 | July 30, 2021 15:30 | 3d 2h | 3,691 | 16K |
| 10 | January 4, 2021 15:00 | February 4, 2021 19:15 | 31d 4h | 3,632 | 47K |
Outage episodes by size in 2021: 177 reached 100+ customers, 54 reached 1,000+ customers, 1 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 Arapahoe 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 |
| Mountain View Elec Assn, Inc | 2021 | 50 min | 0.56 | 50 min | 0.56 |
| Morgan County Rural Elec Assn | - | - | - | - | - |
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 ÷ 323,113 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. Arapahoe County has data for 2015–2025.
Cite this report
MassOutage (massoutage.com), Arapahoe 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/arapahoe-county