County annual report · FIPS 30073
2020 Pondera County, MT Power Outage Report
In 2020, customers in Pondera County, MT went without power for an average of 14.3 hours, a total of 29K customer-hours (Montana average 5.6 hours). That ranks 9th worst of 50 Montana counties and 581st of 3,019 nationally.
Compared with MT, the US and 2019
Coverage line is EAGLE-I's share of Montana customers tracked each year.
Biggest outages in Pondera County, 2020
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 25, 2020 05:30 | December 25, 2020 08:30 | 3h | 2,497 | 5,628 |
| 2 | June 12, 2020 21:15 | June 13, 2020 05:15 | 8h | 1,988 | 9,016 |
| 3 | June 18, 2020 06:00 | June 18, 2020 08:30 | 2h 30m | 1,453 | 3,633 |
| 4 | November 5, 2020 13:45 | November 9, 2020 00:30 | 3d 10h | 774 | 2,020 |
| 5 | August 2, 2020 03:15 | August 3, 2020 02:30 | 23h 15m | 724 | 3,492 |
| 6 | March 9, 2020 21:45 | March 10, 2020 01:30 | 3h 45m | 636 | 1,433 |
| 7 | April 22, 2020 03:30 | April 22, 2020 08:15 | 4h 45m | 297 | 1,001 |
| 8 | July 23, 2020 02:45 | July 23, 2020 08:45 | 6h | 96 | 411 |
| 9 | April 22, 2020 14:30 | April 22, 2020 19:45 | 5h 15m | 83 | 436 |
| 10 | September 8, 2020 02:45 | September 8, 2020 22:15 | 19h 30m | 76 | 154 |
Outage episodes by size in 2020: 7 reached 100+ customers, 3 reached 1,000+ customers, 0 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 Pondera County reported on EIA Form 861 for 2020, 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 |
|---|---|---|---|---|---|
| NorthWestern Energy LLC - (MT) | 2020 | 2.8 hrs | 1.13 | 2.0 hrs | 1.02 |
| WAPA-- Western Area Power Administration | - | - | - | - | - |
| Sun River Electric Coop, Inc | - | - | - | - | - |
| Glacier Electric Coop, Inc | - | - | - | - | - |
| Marias River Electric Coop Inc | - | - | - | - | - |
About this data
- Outage figures come from DOE/ORNL EAGLE-I, which records customers out by county every 15 minutes. EAGLE-I tracked about 76% of Montana's customers in 2020; utilities it does not see are not counted.
- Hours per customer = outage customer-minutes ÷ 2,031 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. Pondera County has data for 2019–2025.
Cite this report
MassOutage (massoutage.com), Pondera County, MT annual power outage report, 2020, 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/2020/montana/pondera-county