County annual report · FIPS 53033
2018 King County, WA Power Outage Report
In 2018, customers in King County, WA went without power for an average of 2.6 hours, a total of 2.5M customer-hours (Washington average 2.1 hours). That ranks 12th worst of 27 Washington counties and 1638th of 2,798 nationally.
Compared with WA, the US and 2017
Coverage line is EAGLE-I's share of Washington customers tracked each year.
Biggest outages in King 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 | December 3, 2018 07:30 | December 31, 2018 00:15 | 27d 16h | 46,213 | 845K |
| 2 | February 5, 2018 13:45 | February 20, 2018 21:45 | 15d 8h | 27,026 | 295K |
| 3 | August 6, 2018 13:30 | August 12, 2018 09:30 | 5d 20h | 19,533 | 46K |
| 4 | January 17, 2018 15:45 | January 20, 2018 23:00 | 3d 7h | 12,918 | 61K |
| 5 | November 24, 2018 16:30 | November 30, 2018 08:00 | 5d 15h | 10,601 | 34K |
| 6 | July 24, 2018 12:45 | July 27, 2018 11:15 | 2d 22h | 10,258 | 68K |
| 7 | June 6, 2018 17:15 | June 11, 2018 06:30 | 4d 13h | 9,948 | 39K |
| 8 | August 25, 2018 06:45 | August 29, 2018 13:15 | 4d 6h | 7,630 | 34K |
| 9 | November 1, 2018 13:15 | November 3, 2018 09:30 | 1d 20h | 7,181 | 31K |
| 10 | November 10, 2018 15:00 | November 22, 2018 04:30 | 11d 13h | 7,071 | 34K |
Outage episodes by size in 2018: 111 reached 100+ customers, 63 reached 1,000+ customers, 6 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 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 |
|---|---|---|---|---|---|
| Puget Sound Energy Inc | 2018 | 7.2 hrs | 1.52 | 2.4 hrs | 0.99 |
| City of Tacoma - (WA) | 2018 | 86 min | 0.77 | 56 min | 0.49 |
| City of Seattle - (WA) | 2018 | 2.2 hrs | 0.71 | 58 min | 0.50 |
| 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 71% of Washington's customers in 2018; 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, 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/washington/king-county