County annual report · FIPS 53033
2021 King County, WA Power Outage Report
In 2021, customers in King County, WA went without power for an average of 9.6 hours, a total of 9.3M customer-hours (Washington average 8.7 hours). That ranks 14th worst of 33 Washington counties and 800th of 2,974 nationally.
Compared with WA, the US and 2020
Coverage line is EAGLE-I's share of Washington customers tracked each year.
Biggest outages in King 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 | January 11, 2021 15:15 | January 24, 2021 15:15 | 13d | 215,586 | 4.0M |
| 2 | October 21, 2021 05:16 | November 17, 2021 15:15 | 27d 9h | 110,243 | 2.5M |
| 3 | September 7, 2021 19:30 | October 3, 2021 04:30 | 25d 9h | 40,660 | 709K |
| 4 | February 10, 2021 16:00 | February 27, 2021 09:30 | 16d 17h | 15,487 | 294K |
| 5 | June 18, 2021 12:30 | August 1, 2021 09:15 | 43d 20h | 13,676 | 345K |
| 6 | November 22, 2021 14:45 | December 10, 2021 11:00 | 17d 20h | 9,852 | 123K |
| 7 | December 10, 2021 15:15 | December 31, 2021 00:15 | 20d 9h | 9,117 | 261K |
| 8 | August 1, 2021 12:30 | September 4, 2021 10:45 | 33d 22h | 8,468 | 318K |
| 9 | May 24, 2021 12:00 | June 8, 2021 05:00 | 14d 17h | 7,144 | 150K |
| 10 | June 13, 2021 12:00 | June 15, 2021 05:45 | 1d 17h | 6,449 | 28K |
Outage episodes by size in 2021: 43 reached 100+ customers, 29 reached 1,000+ customers, 5 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 King 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 |
|---|---|---|---|---|---|
| Puget Sound Energy Inc | 2021 | 14.2 hrs | 2.27 | 3.5 hrs | 1.26 |
| City of Tacoma - (WA) | 2021 | 5.2 hrs | 1.31 | 1.5 hrs | 0.70 |
| City of Seattle - (WA) | 2021 | 4.1 hrs | 0.90 | 1.8 hrs | 0.66 |
| Bonneville Power Administration | - | - | - | - | - |
| Puget Sound Energy Inc,pugetsoundenergy | - | - | - | - | - |
| PUD No 1 of Chelan County | - | - | - | - | - |
| Tanner Electric Coop | - | - | - | - | - |
| City of Milton - (WA) | - | - | - | - | - |
About this data
- Outage figures come from DOE/ORNL EAGLE-I, which records customers out by county every 15 minutes. EAGLE-I tracked about 87% of Washington's customers in 2021; utilities it does not see are not counted.
- Hours per customer = outage customer-minutes ÷ 963,744 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. King County has data for 2015–2025.
Cite this report
MassOutage (massoutage.com), King County, WA 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/washington/king-county