What it costs to charge a 2026 Rivian R1S Dual Standard (20in) in South Dakota

A 2026 Rivian R1S Dual Standard (20in) draws 42.9 kWh per 100 miles per the EPA; at South Dakota's 14.33¢/kWh residential rate that's $6.14 per 100 miles charged at home, versus $16.02 for a 25.5-mpg gas car covering the same distance. That works out to 61.7% cheaper per mile than gasoline in South Dakota — charging at home is much cheaper than gas here.

What a year of driving costs

Home charging this 2026 Rivian R1S Dual Standard (20in) in South Dakota runs about $921 over fueleconomy.gov's default 15,000 annual miles, versus about $2,403 for the gasoline equivalent. Call it about $1,481 saved annually, at this mileage.

Filling up the 2026 Rivian R1S Dual Standard (20in), in dollars

$15.85 — that's what South Dakota's 14.33¢/kWh rate puts on the 110.6 kWh a 2026 Rivian R1S Dual Standard (20in) needs for its full 258-mile EPA range.

Where this ranks

Among all 20,400 state-and-model combinations this site tracks, charging a 2026 Rivian R1S Dual Standard (20in) in South Dakota ranks 10,073 for cost savings versus gas — 1 being the best deal nationally. Separately, the Rivian R1S Dual Standard (20in) ranks 312 of 400 EV models for raw efficiency, and South Dakota ranks 14 of 51 for cheapest residential electricity.

Before you install a home charger in South Dakota

Everything above is the per-mile and per-year cost once a home charger exists — getting one installed is a separate electrical job whose price depends on your panel and wiring, not the state average used here.

Ask a licensed South Dakota electrician to quote the install before this math becomes a real decision.

More on how this number was built

See the methodology guide for exactly which EIA and EPA figures feed 2026 Rivian R1S Dual Standard (20in)'s cost in South Dakota. Curious how South Dakota's 14.33¢/kWh compares? The guide to charging cost by state ranks every state side by side.