Does South Dakota charge a demand charge on EV charging?

Xcel's schedule caps billing demand at monthly kWh divided by 75 hours, and at charging-site utilization the cap binds — the demand charge folds exactly into the bundled energy rate and the model's separate demand line is zero. Where a site's utilization ever exceeded the cap's envelope, the folded rate overstates the bill rather than understating it.

What taxes apply to a charging business in South Dakota?

No corporate or personal income tax exists, and business personal property tax was repealed in 1978. The annual report is $55. Equipment purchases carry sales tax plus the 2% contractor's excise under the conservative reading — about 8.2% effective, editable. No per-kWh charging tax exists.

How current are the modeled rates?

The rates are the final compliance figures from Xcel's 2025 South Dakota rate case, effective July 1, 2026, and the settlement bars new base rates before January 2029. The monthly fuel factor is the one moving part, re-derived as a trailing average at every library refresh.

ForgeAsset / Supercharger ROI / South Dakota

Tesla Supercharger ROI in South Dakota

South Dakota pairs the same demand-cap rate design as its northern neighbor — tighter, at kWh÷75 — with the lightest tax stack in the covered set: no corporate income tax, no personal income tax, no business personal property tax since 1978, and a $55-a-year entity cost. The modeled Xcel rates are compliance-fresh as of July 2026, under a rate moratorium that runs into 2029.

Model a South Dakota site

What makes South Dakota economics distinct

A demand cap with a moratorium behind it

Xcel's E15 schedule caps billing demand at monthly kWh÷75 with no ratchet and no time window — at charging-site load factors the cap binds and the roughly $14.22 per kW demand charge converts exactly into about 19 cents per kWh inside the bundled rate. The 2025 rate-case settlement bars new base rates before January 2029, making this one of the most staleness-proof rows in the library.

No income taxes, no property tax on the machines

South Dakota levies no corporate or personal income tax and repealed business personal property tax in 1978. The entity's fixed costs round to the $55 annual report — against roughly $1,700 in California — and the hardware files no property return at all.

The contractor's excise is the one South Dakota quirk

South Dakota levies a 2% contractor's excise on construction services, and under the conservative reading it reaches owner-furnished materials — the model defaults the effective equipment tax to 8.2% rather than 6.2%, with the favorable fixture classification stated as documented upside. The state sales-tax component also steps from 4.2% to 4.5% in July 2027 under enacted law.

The rate is high; the structure is forgiving

At about 28.5 cents bundled, the Sioux Falls rate is among the highest flat rates in the covered set — but all of it scales with usage. In the ramp years, when a demand-billed site pays for its peak regardless of volume, a fully volumetric bill tracks revenue instead. The model shows exactly where that trade flips.

Utilities and tariffs modeled in South Dakota

Utility & tariff	Energy	Demand
Xcel Energy SD General Service	28.5¢/kWh flat	none (energy-only)

Rates are digit-verified against each utility's own filed sheets and update within two weeks of any revision. Full derivations are on the methodology page.

South Dakota tax profile

Sales tax on hardware: 8.2%
Business personal property tax: none
Clean-fuels credit: no program
Per-kWh charging excise: none

South Dakota tax defaults applied: no clean-fuels credit program exists in South Dakota (the LCFS revenue line is $0), business personal property tax was repealed in 1978 (that line is $0), and no state income taxes exist — LLC costs are the $55/yr annual report, the lightest entity stack in the covered set. Sales tax defaults to 8.2%, which includes the 2% contractor's excise reaching owner-furnished materials under the conservative reading; a favorable fixture classification lowers it toward 6.2% and the field is editable. The state sales-tax component steps from 4.2% to 4.5% in July 2027 under enacted law. No per-kWh charging tax exists in South Dakota.

South Dakota programs and incentives

NEVI (federal, SDDOT-administered)

Roughly $29 million over five years for corridor DC fast charging along I-90 and I-29; the South Dakota DOT administers rounds.

South Dakota charging market

South Dakota carries roughly 10 Supercharger stations along I-90 and I-29 through Sioux Falls, Rapid City, and the Black Hills tourism corridor. Xcel serves Sioux Falls (with a co-op fringe resolved per parcel); Rapid City is Black Hills Energy territory, which the model does not yet cover — a pending rate case requesting roughly 25% gates that row.

South Dakota Supercharger ROI — questions

Does South Dakota charge a demand charge on EV charging?: Xcel's schedule caps billing demand at monthly kWh divided by 75 hours, and at charging-site utilization the cap binds — the demand charge folds exactly into the bundled energy rate and the model's separate demand line is zero. Where a site's utilization ever exceeded the cap's envelope, the folded rate overstates the bill rather than understating it.
What taxes apply to a charging business in South Dakota?: No corporate or personal income tax exists, and business personal property tax was repealed in 1978. The annual report is $55. Equipment purchases carry sales tax plus the 2% contractor's excise under the conservative reading — about 8.2% effective, editable. No per-kWh charging tax exists.
How current are the modeled rates?: The rates are the final compliance figures from Xcel's 2025 South Dakota rate case, effective July 1, 2026, and the settlement bars new base rates before January 2029. The monthly fuel factor is the one moving part, re-derived as a trailing average at every library refresh.

Sources

Model a Tesla V4 Supercharger site in South Dakota — payback, NPV, IRR, and a 15-year cash flow from your own inputs.

Run a South Dakota scenario

Other states: California, North Carolina, Georgia, Oregon, Pennsylvania, Florida, Arizona, Texas, Virginia, Illinois, Michigan, Tennessee, Montana, Idaho, Kansas, Nebraska, North Dakota, Wyoming. Coverage spans nineteen states in total — see the full list.

ForgeAsset is software, not investment, tax, or legal advice — outputs are model estimates from your inputs, not guarantees. Rates and programs current as of research; verify current terms with each source before committing capital.