Charging a 2027 Rivian R1S Premium (20in AT) at home in Idaho

In Idaho, home electricity runs 12.8¢/kWh — put a 2027 Rivian R1S Premium (20in AT)'s EPA-rated 44.4 kWh/100mi against that and 100 miles costs $5.68, versus $16.02 for a gas car averaging 25.5 mpg. That works out to 64.6% cheaper per mile than gasoline in Idaho — charging at home is much cheaper than gas here.

Annual cost, at 15 thousands miles a year

Idaho owners putting 15,000 annual miles on a 2027 Rivian R1S Premium (20in AT) spend about $852 on home electricity, compared to about $2,403 a gas-car equivalent would spend on fuel. Call it about $1,551 saved annually, at this mileage.

Filling up the 2027 Rivian R1S Premium (20in AT), in dollars

At Idaho's rate, fully covering this 2027 Rivian R1S Premium (20in AT)'s 289-mile EPA range costs about $16.41 (128.2 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 Premium (20in AT) in Idaho ranks 7,800 for cost savings versus gas — 1 being the best deal nationally. Separately, the Rivian R1S Premium (20in AT) ranks 342 of 400 EV models for raw efficiency, and Idaho ranks 3 of 51 for cheapest residential electricity.

Before you install a home charger in Idaho

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.

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

More on how this number was built

See the methodology guide for exactly which EIA and EPA figures feed 2027 Rivian R1S Premium (20in AT)'s cost in Idaho. Idaho is one of the cheapest states for home electricity — the guide to why the cost varies so much by state covers what drives that.