2026 Rivian R1S Dual Max (22in): home charging cost in South Dakota

At South Dakota's residential electricity rate of 14.33¢/kWh, a 2026 Rivian R1S Dual Max (22in) (rated 39.9 kWh per 100 miles by the EPA) costs $5.72 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. Charging at home is much cheaper than gas here: 64.3% less than gas per mile, here specifically.

Annual cost, at 15 thousands miles a year

Driving 15,000 miles a year — fueleconomy.gov's own default assumption — a 2026 Rivian R1S Dual Max (22in) charged at home in South Dakota costs about $858/year in electricity, against about $2,403/year for the gas-car comparison. That's a savings of about $1,544 a year.

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

A 2026 Rivian R1S Dual Max (22in) needs roughly 163.7 kWh to reach its EPA-rated 410-mile range, which runs about $23.47 at 14.33¢/kWh in South Dakota.

How this compares nationally

This combination ranks 8,101 of 20,400 state/model pairs for cost savings against gas (1 is cheapest). The Rivian R1S Dual Max (22in) alone ranks 265 of 400 models for efficiency; South Dakota alone ranks 14 of 51 states for electricity price.

Before you install a home charger in South Dakota

The numbers above assume Level 2 home charging is already in place — the electrical work behind that is a real, separate cost that varies by panel, wiring, and local labor rates, not something this page's per-mile math includes.

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

Where these figures come from

Every figure on this page traces to a named EIA or EPA dataset — see the methodology guide. South Dakota's 14.33¢/kWh rate ranks 14 of 51 states; the state rate guide lays out the full spread.