FORT THOMPSON

Substation

South Dakota · NORTHWESTERN ENERGY - (SD)

Max voltage
345
kV

FORT THOMPSON is an electric transmission substation in South Dakota, operated by NORTHWESTERN ENERGY - (SD). It is classified as high-voltage (345 kv) and connects 15 transmission lines. Substation proximity is one of the strongest speed-to-power signals for siting a datacenter — interconnection distance to an energized, high-voltage bus is often the binding constraint on time-to-energization.

Voltage & classification

Max voltage345 kV
Min voltage230 kV
Voltage classHigh-voltage (345 kV)
Connected lines15

Ownership & operation

OperatorNORTHWESTERN ENERGY - (SD)
Co-ownerWAPA-- WESTERN AREA POWER ADMINISTRATION
Coordinates43.9591, -99.3375

Connected transmission lines

Lines terminating at or passing through this substation, by HIFLD line ID, highest voltage first.

Line IDVoltageOwnerStatusLength
#39481345 kVWAPA-- WESTERN AREA POWER ADMINISTRATIONIN SERVICE242.0 mi
#4909230 kVWAPA-- WESTERN AREA POWER ADMINISTRATIONIN SERVICE59.2 mi
#6843230 kVNORTHWESTERN ENERGY - (SD)IN SERVICE57.4 mi
#13594230 kVWAPA-- WESTERN AREA POWER ADMINISTRATIONIN SERVICE44.0 mi
#24090230 kVWAPA-- WESTERN AREA POWER ADMINISTRATIONIN SERVICE57.4 mi
#26397230 kVWAPA-- WESTERN AREA POWER ADMINISTRATION7.3 mi
#34057230 kVWAPA-- WESTERN AREA POWER ADMINISTRATIONIN SERVICE75.8 mi
#38289230 kVWAPA-- WESTERN AREA POWER ADMINISTRATIONIN SERVICE42.8 mi
#38979230 kVWAPA-- WESTERN AREA POWER ADMINISTRATIONIN SERVICE59.2 mi
#39017230 kVWAPA-- WESTERN AREA POWER ADMINISTRATION7.2 mi
#41018230 kVWAPA-- WESTERN AREA POWER ADMINISTRATIONIN SERVICE55.3 mi
#41562230 kVWAPA-- WESTERN AREA POWER ADMINISTRATIONIN SERVICE87.4 mi

Browse the full transmission-line map →

Nearby datacenter candidate sites

Scored candidate sites within roughly 25 miles of FORT THOMPSON, ranked by DC Readiness. Sites this close to an energized substation carry a strong speed-to-power advantage.

Candidate sites near FORT THOMPSON substation
SiteTypeStateCountyVoltageCapacityQueue waitScore
FORT THOMPSONSubstation-AdjacentSDBuffalo County345 kV600 MW1.0 yrs70.6
LAKE PLATTESubstation-AdjacentSDBrule County230 kV300 MW1.0 yrs69.0
Greenfield (FORT THOMPSON - LELAND OLDS)GreenfieldSDHyde County345 kV600 MW1.4 yrs67.4
UNKNOWN131929Substation-AdjacentSDBuffalo County345 kV600 MW1.0 yrs67.2
Greenfield (UNKNOWN131929 - FORT THOMPSON)GreenfieldSDBrule County345 kV600 MW1.0 yrs66.2
Greenfield (FORT THOMPSON - LELAND OLDS)GreenfieldSDBuffalo County345 kV600 MW1.4 yrs66.1
Greenfield (UNKNOWN131929 - FORT THOMPSON)GreenfieldSDBrule County345 kV600 MW1.0 yrs66.0
Greenfield (UNKNOWN131929 - FORT THOMPSON)GreenfieldSDBrule County345 kV600 MW1.0 yrs66.0

Dataset updated . Screening estimates derived from public data sources.

Substation attributes are derived from public HIFLD / EIA infrastructure data and may lag real-world upgrades or retirements. Voltage and connected-line counts are screening figures — confirm available capacity and interconnection terms directly with the operating utility and ISO.

Go deeper than the public screen

This page shows a public slice of the GridCensus dataset for FORT THOMPSON substation, South Dakota. Pro and Enterprise plans unlock the full 164,098-site catalog, raw sub-scores, parcel ownership, interconnection-queue detail, saved searches, and programmatic API access.