Charging a 2027 Rivian R1S Performance (20in AT) at home in South Dakota
At South Dakota's residential electricity rate of 14.33¢/kWh, a 2027 Rivian R1S Performance (20in AT) (rated 49.8 kWh per 100 miles by the EPA) costs $7.14 to drive 100 miles on home charging, against $16.02 for the same distance in a car averaging 25.5 mpg on gasoline at $4.085/gallon. That works out to 55.4% 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 2027 Rivian R1S Performance (20in AT) spend about $1,071 on home electricity, compared to about $2,403 a gas-car equivalent would spend on fuel. Call it about $1,332 saved annually, at this mileage.
Filling up the 2027 Rivian R1S Performance (20in AT), in dollars
At South Dakota's rate, fully covering this 2027 Rivian R1S Performance (20in AT)'s 329-mile EPA range costs about $23.49 (164 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 2027 Rivian R1S Performance (20in AT) in South Dakota ranks 13,407 for cost savings versus gas — 1 being the best deal nationally. Separately, the Rivian R1S Performance (20in AT) ranks 386 of 400 EV models for raw efficiency, and South Dakota ranks 14 of 51 for cheapest residential electricity.
Getting set up to charge a 2027 Rivian R1S Performance (20in AT) at home
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. South Dakota's 14.33¢/kWh rate ranks 14 of 51 states; the state rate guide lays out the full spread.