State · EIA Form 861 · SD
South Dakota
According to the U.S. Energy Information Administration's EIA Form 861, SAIDI and SAIFI for South Dakota utilities come from the federal annual survey. 7 utilities report reliability metrics; figures are customer-weighted state averages, not a guarantee for any single address.
Signature read: short chronic outage minutes relative to the 51-state Form 861 cohort (<=156 min tercile cut).
EIA Form 861 · Continuity Brief
South Dakota
EIA Form 861 Continuity Brief · August 2026 · IEEE 1366 SAIDI/SAIFI minutes, not a storm forecast.
South Dakota sits in the lower-third SAIDI band at 83.4 minutes across 7 reporting utilities (Watertown Municipal Utilities lowest at 7.4), under the live national mean of 341.
Named SAIDI peers (in-state best + nearest-state averages)
State SAIDI neighbourhood (minutes / customer-year)
- South Dakota 83.4
- Nebraska 72.6
- District of Columbia 71.9
- Colorado 99.4
- Rhode Island 104.6
- Iowa 105.2
Lower is fewer interruption minutes. Neighbours are nearest other-state averages in this corpus.
South Dakota vs all states by EIA Form 861 utility headcount
Where this state's reporting utility count sits among every state in the Form 861 file (coverage density, not reliability quality)
7 Top 75% more reporting utilities than 25% of 51 states
States, banded by electric utilities reporting on EIA Form 861
Each bar is a band; taller bars hold more states. The dashed line + filled bar mark this entry. Hover or tap any bar for its full count and share, and where it sits relative to this entry.
Source EIA Form 861 · 2026-08-30
Utilities Ranked by Reliability · South Dakota short-outage cohort
All 7 electric utilities in South Dakota with reliability data, sorted by 2023 SAIDI; statewide average sits in the lower-third Form 861 band.
Lowest-SAIDI utilities in South Dakota
Fewest outage minutes · live table sort
Top 7 South Dakota utilities by fewest outage minutes. Lower SAIDI is better - not a quality score beyond interruption duration.
Lowest-SAIDI utilities in South Dakota
| # | Utility | Type | SAIDI 2023 | SAIFI 2023 | Customers |
|---|---|---|---|---|---|
| 1 | Watertown Municipal Utilities | Municipal | 7.4 | 0.10 | 13,993 |
| 2 | West River Electric Assn Inc | Cooperative | 38.1 | 0.46 | 20,260 |
| 3 | Southeastern Electric Coop Inc - (SD) | Cooperative | 53.8 | - | 22,283 |
| 4 | City of Brookings - (SD) | Municipal | 61.8 | 1.16 | 11,954 |
| 5 | Northern Electric Coop, Inc | Cooperative | 73.9 | 0.67 | 6,717 |
| 6 | NorthWestern Energy - (SD) | IOU | 116.5 | 1.37 | 64,654 |
| 7 | Black Hills Electric Coop, Inc | Cooperative | 163.8 | 0.78 | 11,185 |
Nationwide states with similar utility inventory
Cross-state peer sets for South Dakota (lower-third SAIDI band). Nearest-SAIDI neighbors stay in Read-with; these neighborhoods compare EIA Form 861 headcount and summed customer accounts.
Similar utility headcount
Nearest states by reporting utility count (7 here).
Read with this South Dakota roster · short-outage band
- Lowest published SAIDI in South Dakota: Watertown Municipal Utilities (7.4 min)
- Highest published SAIDI in South Dakota: Black Hills Electric Coop, Inc (163.8 min)
- Ownership mix here: Cooperative leads (4 of 7 utilities) · national type means
- Nearest avg SAIDI: Nebraska (72.6 min)
- Nearest avg SAIDI: District of Columbia (71.9 min)
- Nearest avg SAIDI: Colorado (99.4 min)
- Nearest avg SAIDI: Rhode Island (104.6 min)
- Nearest avg SAIDI: Iowa (105.2 min)
Source: U.S. Energy Information Administration (EIA) Form 861 Annual Electric Power Industry Report, reliability · 2020-2023 State averages are rebuilt from utility filings in this portal DB; corpus ranks use headcount and customer sums.