Charging a 2026 Tesla Model S at home in Montana

At Montana's residential electricity rate of 13.77¢/kWh, a 2026 Tesla Model S (rated 27.1 kWh per 100 miles by the EPA) costs $3.74 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 76.7% cheaper per mile than gasoline in Montana — charging at home costs a fraction of what gas would here.

Annual cost, at 15 thousands miles a year

Montana owners putting 15,000 annual miles on a 2026 Tesla Model S spend about $560 on home electricity, compared to about $2,403 a gas-car equivalent would spend on fuel. Call it about $1,843 saved annually, at this mileage.

Filling up the 2026 Tesla Model S, in dollars

At Montana's rate, fully covering this 2026 Tesla Model S's 410-mile EPA range costs about $15.32 (111.2 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 2026 Tesla Model S in Montana ranks 435 for cost savings versus gas — 1 being the best deal nationally. Separately, the Tesla Model S ranks 20 of 400 EV models for raw efficiency, and Montana ranks 10 of 51 for cheapest residential electricity.

Next step: home charger installation

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 Montana electrician to quote the install before this math becomes a real decision.

More on how this number was built

See the methodology guide for exactly which EIA and EPA figures feed 2026 Tesla Model S's cost in Montana. Montana's 13.77¢/kWh rate ranks 10 of 51 states; the state rate guide lays out the full spread.