ForgeAsset / Utilities / Southeastern Electric Cooperative (South Dakota)

Southeastern Electric Cooperative (South Dakota) GS Three-Phase Large Power — EV fast-charging electricity cost

Southeastern Electric Large Power is the filed rate schedule ForgeAsset models for DC fast-charging sites in Southeastern Electric Cooperative territory in South Dakota. Energy prices at 5.6¢/kWh flat; the demand side bills none. For one reference Supercharger site held constant across the whole library, that works out to 6.3¢/kWh per dispensed kWh — rank 3 of 94 filed tariffs (1 = least expensive).

Modeled rates

Southeastern Electric Cooperative's three-phase large power rate for the Sioux Falls fringe and rural southeastern South Dakota (Harrisburg, Tea, Salem, Marion). Demand is billed per kilowatt of the anytime monthly peak, and energy prices in declining blocks keyed to each month's energy per kilowatt of demand, which the model expresses as load-factor tiers; at fast-charging utilization all energy bills at the higher first-block rate. Rates fold South Dakota's 4.2% state sales tax; the 2% municipal sales tax inside city limits is site-dependent and not included, and the state rate is enacted to return to 4.5% in July 2027. The schedule applies above 50 kilowatts of average monthly demand, carries a purchased-power cost adjustment with no published factor, and adjusts demand upward for power factor below 90% lagging. The $225 monthly facility charge is not modeled. South Dakota tax defaults apply on address resolve.

The filed rate book for this territory records no EV-specific commercial rate, so the modeled cost is the standard schedule. Demand follows the model's conservative convention — 150 kW per stall billed every month, the worst-case coincident peak — so a site whose metered peak runs below that would see a lower demand line.

Source: Southeastern Electric Cooperative (South Dakota) filed rate schedule. Rates are digit-verified against the utility's own filed sheets and update within two weeks of any revision; derivations are on the methodology page.

What the reference site pays here

Reference site: 8 Tesla V4 stalls at 235 kWh/stall/day (57,183 kWh dispensed per month), a 150kW per-stall demand assumption, the model's default time-of-use mix, and a 12% loss gross-up — identical to the full utility ranking, where this tariff sits at position 3 of 94.

The rest of the South Dakota picture

The tariff is one layer. State taxes, incentives, clean-fuels programs, and the charging market shape the remainder — Tesla Supercharger ROI in South Dakota covers them, and the US Supercharger Economics Map shows every US Supercharger over utility territories colored by this same effective-cost derivation.

Southeastern Electric Cooperative (South Dakota) GS Three-Phase Large Power — questions

What does Southeastern Electric Cooperative (South Dakota) charge for energy on GS Three-Phase Large Power?

The modeled rates are 5.6¢/kWh flat. At the model's default time-of-use mix (30% peak, 45% off-peak, 25% super-off-peak) that blends to 5.6¢/kWh.

Does GS Three-Phase Large Power carry a demand charge?

No separable demand charge is billed under the modeled structure — the cost sits in the energy rates instead.

What does electricity cost per kWh dispensed on this tariff?

For the reference site — 8 Tesla V4 stalls dispensing 235 kWh per stall per day, with a 12% loss gross-up — the all-in utility cost works out to 6.3¢/kWh per dispensed kWh, rank 3 of 94 tariffs in the library (1 = least expensive).

ForgeAsset is software, not investment, tax, or legal advice — outputs are model estimates from your inputs, not guarantees. Rates current as of research; verify current terms with the utility's filed schedule before committing capital.