Charging a 2026 Rivian R1S Dual Standard (20in) at home in Iowa

At Iowa's residential electricity rate of 13.77¢/kWh, a 2026 Rivian R1S Dual Standard (20in) (rated 42.9 kWh per 100 miles by the EPA) costs $5.9 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 63.2% cheaper per mile than gasoline in Iowa — charging at home is much cheaper than gas here.

What a year of driving costs

Iowa owners putting 15,000 annual miles on a 2026 Rivian R1S Dual Standard (20in) spend about $885 on home electricity, compared to about $2,403 a gas-car equivalent would spend on fuel. Call it about $1,517 saved annually, at this mileage.

Cost of a full charge

At Iowa's rate, fully covering this 2026 Rivian R1S Dual Standard (20in)'s 258-mile EPA range costs about $15.23 (110.6 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 Dual Standard (20in) in Iowa ranks 8,886 for cost savings versus gas — 1 being the best deal nationally. Separately, the Rivian R1S Dual Standard (20in) ranks 312 of 400 EV models for raw efficiency, and Iowa ranks 9 of 51 for cheapest residential electricity.

Before you install a home charger in Iowa

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.

Ask a licensed Iowa electrician to quote the install before this math becomes a real decision.

More on how this number was built

Every figure on this page traces to a named EIA or EPA dataset — see the methodology guide. At 13.77¢/kWh, Iowa sits in the middle of the national range — the guide to why charging cost varies by state shows where.