County annual report · FIPS 53033
2015 King County, WA Power Outage Report
In 2015, customers in King County, WA went without power for an average of 6.0 hours, a total of 5.7M customer-hours (Washington average 9.1 hours). That ranks 11th worst of 23 Washington counties and 468th of 2,484 nationally.
Compared with WA, the US
Coverage line is EAGLE-I's share of Washington customers tracked each year.
Biggest outages in King County, 2015
The 10 outage episodes with the most customers out at once. Times are UTC.
| # | Started (UTC) | Ended (UTC) | Duration | Peak out | Customer-hours |
|---|---|---|---|---|---|
| 1 | August 25, 2015 13:45 | September 8, 2015 00:30 | 13d 10h | 117,262 | 1.9M |
| 2 | November 12, 2015 08:45 | November 18, 2015 15:00 | 6d 6h | 114,507 | 1.5M |
| 3 | October 12, 2015 13:45 | November 1, 2015 04:00 | 19d 14h | 64,221 | 291K |
| 4 | November 18, 2015 15:45 | November 23, 2015 07:15 | 4d 15h | 55,641 | 436K |
| 5 | December 2, 2015 16:30 | December 21, 2015 16:45 | 19d | 51,236 | 768K |
| 6 | October 10, 2015 13:30 | October 12, 2015 13:00 | 1d 23h | 29,881 | 125K |
| 7 | January 18, 2015 08:00 | January 20, 2015 13:15 | 2d 5h | 15,427 | 115K |
| 8 | July 8, 2015 19:45 | July 9, 2015 00:30 | 4h 45m | 9,655 | 12K |
| 9 | September 14, 2015 14:30 | September 26, 2015 13:45 | 11d 23h | 8,622 | 37K |
| 10 | July 20, 2015 23:15 | July 22, 2015 20:30 | 1d 21h | 7,850 | 13K |
Outage episodes by size in 2015: 140 reached 100+ customers, 35 reached 1,000+ customers, 7 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 2015, 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 | 2015 | 12.7 hrs | 2.18 | 2.7 hrs | 1.04 |
| City of Seattle - (WA) | 2015 | 3.1 hrs | 0.66 | 63 min | 0.50 |
| Bonneville Power Administration | - | - | - | - | - |
| Puget Sound Energy Inc,pugetsoundenergy | - | - | - | - | - |
| City of Tacoma - (WA) | - | - | - | - | - |
| 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 n/a of Washington's customers in 2015; 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, 2015, 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/2015/washington/king-county