South Dakota (SD) data center power coverage
Real, sourced large-load tariff and interconnection research on file for South Dakota — never inferred, never scraped, never implied beyond what's actually been checked.
Large-load tariffs
Otter Tail Power (South Dakota) -- petition pending
Threshold75 MW and above (proposed)
StatusOtter Tail petitioned the South Dakota PUC on July 27, 2026 (docket EL26-021) for a new very-large-customer class and a data-center rate schedule. Approval pending. Not confirmed: final terms, and the status of the state's data-center bill (sources conflicted). No large-load tariff was found for Black Hills Energy or Xcel/NSP in South Dakota (NSP's Minnesota tariff was approved May 15, 2026 with a 15-year minimum term; its Wisconsin filing is a separate matter).
SourceSouth Dakota PUC docket EL26-021 correspondence (puc.sd.gov); KELOLAND coverage of the Otter Tail petition.
Black Hills Power (South Dakota), Economic Flexible Load Service tariff for blockchain loads
ThresholdInterruptible loads of 10 MW (10,000 kW) or more connected to Black Hills' system; written for new blockchain customers
StatusAPPROVED by the South Dakota PUC on January 27, 2026 (Docket EL25-019, stipulation with staff; one commissioner dissented), effective January 29, 2026. Customers carry an appropriate share of system costs to limit stranded-asset, capacity and transmission-constraint impacts on other customers, and losses from the service are not recovered from other customers. This is an interruptible blockchain tariff, not a general data center tariff: whether a conventional data center can use it, and what firm-service terms apply, was not found. The detailed rate sheets were not readable.
SourceSouth Dakota PUC order granting joint motion, Docket EL25-019 (read in full).
Basin Electric Power Cooperative (Dakotas and Montana), Large Load Commercial Program
ThresholdNot published in the sources found; applies to non-traditional large loads requesting service from member systems
StatusLOWER CONFIDENCE. Basin adopted a Large Load Commercial Program in June 2025 so that new large loads bear the generation and transmission cost and risk of serving them and existing members are shielded. Basin reports 26 applications since June 13, 2025, 17 active. A multi-gigawatt data center campus with a NextEra gas plant in Mercer County, North Dakota is being developed under the program. Contract terms and rates were not found.
SourceBasin Electric news releases (basinelectric.com); program documents not read.
Interconnection & regulatory guidance
South Dakota — signed statewide law (10 MW+) + Otter Tail Power's proposed large-load rate (75 MW+), pending PUC approval
Contact guidanceTwo distinct real actions exist here: a signed state law applying new limits to data centers generally, and a specific utility's (Otter Tail Power) own proposed rate structure. Confirm which applies to a given site's specific utility before relying on either threshold.
ThresholdThe signed state law (March 2026) applies new limits to data centers with peak electrical demand of 10 MW or more -- the exact nature of those limits was not independently confirmed from the bill text during this research. Separately, Otter Tail Power's proposed special rate structure would apply to data centers taking at least 75 MW.
ProcessOtter Tail Power (a Minnesota-based utility serving part of South Dakota) requires South Dakota PUC approval for its proposed large-load rate structure -- not yet adopted as of this research.
SourceSouth Dakota Searchlight (southdakotasearchlight.com) and KELOLAND (keloland.com) coverage; SD Legislature bill text (mylrc.sdlegislature.gov) not independently re-read in full during this research -- confirm the exact nature of the 10 MW limit directly before relying on it.
Land-constraint screening
Every Kill Test automatically screens against 6 nationwide land-constraint layers, South Dakota included — no state-by-state gaps here.
FEMA Flood ZoneNearby WetlandsProtected / Conservation LandCritical HabitatSeismic HazardTribal Land
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