Charging a 2026 Rivian R1S Quad Max (20in AT) at home in South Dakota

A 2026 Rivian R1S Quad Max (20in AT) draws 50.1 kWh per 100 miles per the EPA; at South Dakota's 14.33¢/kWh residential rate that's $7.18 per 100 miles charged at home, versus $16.02 for a 25.5-mpg gas car covering the same distance. That works out to 55.2% cheaper per mile than gasoline in South Dakota — charging at home is much cheaper than gas here.

Annual cost, at 15 thousands miles a year

South Dakota owners putting 15,000 annual miles on a 2026 Rivian R1S Quad Max (20in AT) spend about $1,077 on home electricity, compared to about $2,403 a gas-car equivalent would spend on fuel. Call it about $1,326 saved annually, at this mileage.

What one full charge costs

At South Dakota's rate, fully covering this 2026 Rivian R1S Quad Max (20in AT)'s 325-mile EPA range costs about $23.33 (162.8 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 (20in AT) in South Dakota ranks 13,503 for cost savings versus gas — 1 being the best deal nationally. Separately, the Rivian R1S Quad Max (20in AT) ranks 392 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.

Get quotes from local electricians for Level 2 charger installation in South Dakota before deciding.

More on how this number was built

The methodology guide names the exact EIA and EPA tables behind this page's numbers. 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.