2026 Rivian R1S Dual Large Plus (20in): home charging cost in Iowa

A 2026 Rivian R1S Dual Large Plus (20in) draws 43.1 kWh per 100 miles per the EPA; at Iowa's 13.77¢/kWh residential rate that's $5.94 per 100 miles charged at home, versus $16.02 for a 25.5-mpg gas car covering the same distance. Charging at home is much cheaper than gas here: 62.9% less than gas per mile, here specifically.

What a year of driving costs

Driving 15,000 miles a year — fueleconomy.gov's own default assumption — a 2026 Rivian R1S Dual Large Plus (20in) charged at home in Iowa costs about $891/year in electricity, against about $2,403/year for the gas-car comparison. That's a savings of about $1,512 a year.

Cost of a full charge

A 2026 Rivian R1S Dual Large Plus (20in) needs roughly 136.7 kWh to reach its EPA-rated 317-mile range, which runs about $18.82 at 13.77¢/kWh in Iowa.

How this compares nationally

This combination ranks 9,112 of 20,400 state/model pairs for cost savings against gas (1 is cheapest). The Rivian R1S Dual Large Plus (20in) alone ranks 327 of 400 models for efficiency; Iowa alone ranks 9 of 51 states for electricity price.

Before you install a home charger in Iowa

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 Iowa electrician quotes for Level 2 install before you commit either way.

Where these figures come from

The methodology guide names the exact EIA and EPA tables behind this page's numbers. Iowa's 13.77¢/kWh rate ranks 9 of 51 states; the state rate guide lays out the full spread.