Charging a 2026 Rivian R1S Quad Max (22in UHP) at home in South Dakota

A 2026 Rivian R1S Quad Max (22in UHP) draws 47.3 kWh per 100 miles per the EPA; at South Dakota's 14.33¢/kWh residential rate that's $6.78 per 100 miles charged at home, versus $16.02 for a 25.5-mpg gas car covering the same distance. That works out to 57.6% cheaper per mile than gasoline in South Dakota — charging at home is much cheaper than gas here.

What a year of driving costs

South Dakota owners putting 15,000 annual miles on a 2026 Rivian R1S Quad Max (22in UHP) spend about $1,018 on home electricity, compared to about $2,403 a gas-car equivalent would spend on fuel. Call it about $1,385 saved annually, at this mileage.

Filling up the 2026 Rivian R1S Quad Max (22in UHP), in dollars

At South Dakota's rate, fully covering this 2026 Rivian R1S Quad Max (22in UHP)'s 338-mile EPA range costs about $22.93 (160 kWh) — the energy the EPA test actually used, not the battery's rated size.

How this compares nationally

Among all 20,400 state-and-model combinations this site tracks, charging a 2026 Rivian R1S Quad Max (22in UHP) in South Dakota ranks 12,454 for cost savings versus gas — 1 being the best deal nationally. Separately, the Rivian R1S Quad Max (22in UHP) ranks 373 of 400 EV models for raw efficiency, and South Dakota ranks 14 of 51 for cheapest residential electricity.

Next step: home charger installation

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.

Line up a few South Dakota electrician quotes for Level 2 install before you commit either way.

More on how this number was built

See the methodology guide for exactly which EIA and EPA figures feed 2026 Rivian R1S Quad Max (22in UHP)'s cost in South Dakota. At 14.33¢/kWh, South Dakota sits in the middle of the national range — the guide to why charging cost varies by state shows where.