Charging the median electric car at home in Idaho costs about $50 a month at 14.37 cents per kilowatt-hour — the 10th cheapest of 51 states. Cheap power is the whole argument for an electric car in Idaho: the same miles burn $170 of petrol, so the meter saves $119 a month and $1,432 a year, and the state has one public fast-charging plug for every 46 electric cars registered in it.
What electricity costs in Idaho
Electricity is cheap in Idaho, and that is most of the story of what an electric car costs to run here. The EIA published residential average for Idaho is 14.37 cents per kWh (June 2026), against a US average of 18.34. That puts Idaho at 10th of 51 states and DC, cheapest first — the cheaper half of the country. Put the Chevrolet Equinox EV FWD on that rate — the middle car of the 36 rated here, at 31.1 kWh per 100 miles — and it costs $4.47 per 100 miles, $50 a month, $603 a year.
The line where home charging stops beating petrol sits around 48 cents per kWh, at $4.07 a gallon and 27 mpg. Idaho is below that line by 34.10 cents, so the saving holds at the state-average rate before any overnight tariff is applied. The state average is already low enough that a time-of-use plan changes the answer by a few dollars rather than reversing it; the running-cost calculator will show you the few dollars.
Every EPA-rated car, charged at home in Idaho
Efficiency is worth more in Idaho than in most states: $68 a month separates the Lucid Air Pure RWD from the GMC Hummer EV Pickup 3X, and every car in the table still beats the $170 the petrol car burns through.
| Car | EPA kWh / 100 mi | Per 100 miles | Per month | Per year | Saved vs petrol / month |
|---|---|---|---|---|---|
| Lucid Air Pure RWD | 23.1 | $3.32 | $37 | $448 | $132 |
| Hyundai Ioniq 6 Long Range RWD | 26.0 | $3.74 | $42 | $504 | $128 |
| Tesla Model 3 Long Range AWD | 26.4 | $3.79 | $43 | $512 | $127 |
| Lexus RZ 350e FWD | 26.6 | $3.82 | $43 | $516 | $127 |
| Tesla Model Y Long Range AWD | 27.5 | $3.95 | $44 | $533 | $125 |
| Nissan Leaf 75 kWh | 27.8 | $3.99 | $45 | $539 | $125 |
| Subaru Solterra AWD | 28.0 | $4.02 | $45 | $543 | $124 |
| Toyota bZ4X AWD 73.1 kWh | 28.0 | $4.02 | $45 | $543 | $124 |
| BMW i4 eDrive40 | 28.5 | $4.10 | $46 | $553 | $124 |
| Kia EV3 Long Range FWD | 29.0 | $4.17 | $47 | $563 | $123 |
| Volvo EX30 Single Motor Extended Range | 29.2 | $4.20 | $47 | $566 | $122 |
| Audi Q4 45 e-tron | 29.4 | $4.22 | $48 | $570 | $122 |
| Kia EV6 84 kWh RWD | 29.6 | $4.25 | $48 | $574 | $122 |
| Polestar 2 Single Motor | 29.6 | $4.25 | $48 | $574 | $122 |
| Volkswagen ID.4 Pro | 29.8 | $4.28 | $48 | $578 | $121 |
| Hyundai Ioniq 5 84 kWh RWD | 30.0 | $4.31 | $48 | $582 | $121 |
| Ford Mustang Mach-E Extended Range RWD | 30.7 | $4.41 | $50 | $596 | $120 |
| Mercedes-Benz CLA 250+ with EQ Technology | 31.0 | $4.45 | $50 | $601 | $119 |
| Chevrolet Equinox EV FWD | 31.1 | $4.47 | $50 | $603 | $119 |
| Ford Mustang Mach-E Standard Range RWD | 31.4 | $4.51 | $51 | $609 | $119 |
| Cadillac Optiq RWD | 32.1 | $4.61 | $52 | $623 | $118 |
| Chevrolet Blazer EV FWD | 32.3 | $4.64 | $52 | $627 | $117 |
| Honda Prologue FWD | 32.5 | $4.67 | $53 | $630 | $117 |
| Genesis GV60 AWD | 33.6 | $4.83 | $54 | $652 | $115 |
| Nissan Ariya e-4ORCE 87 kWh | 36.6 | $5.26 | $59 | $710 | $110 |
| Cadillac Lyriq RWD | 36.8 | $5.29 | $59 | $714 | $110 |
| Acura ZDX RWD | 36.9 | $5.30 | $60 | $716 | $110 |
| Hyundai Ioniq 9 RWD | 37.0 | $5.32 | $60 | $718 | $110 |
| Porsche Taycan (rear-wheel drive) | 37.1 | $5.33 | $60 | $720 | $110 |
| Rivian R1S Dual Motor, Max pack | 39.9 | $5.73 | $65 | $774 | $105 |
| Kia EV9 99.8 kWh AWD | 40.0 | $5.75 | $65 | $776 | $105 |
| Tesla Cybertruck Long Range | 40.9 | $5.88 | $66 | $793 | $103 |
| Rivian R1T Dual Motor, Large pack | 42.9 | $6.16 | $69 | $832 | $100 |
| Ford F-150 Lightning Extended Range | 47.9 | $6.88 | $77 | $929 | $92 |
| Chevrolet Silverado EV Max Range | 49.5 | $7.11 | $80 | $960 | $90 |
| GMC Hummer EV Pickup 3X | 65.1 | $9.35 | $105 | $1,263 | $64 |
| A 27 mpg petrol car at $4.07 a gallon | — | $15.07 | $170 | $2,035 | — |
The kWh figures are EPA combined ratings measured at the wall, so charger and cable losses are already inside them. Working from battery size instead would have shaved about a tenth off every number above — small money at 14.37 cents, but the same tenth that decides the close rows. Four cars have no US rating and appear in kilometres on the national page.
Public fast charging in Idaho
Idaho has 86 public DC fast-charging sites with 309 plugs in the federal AFDC station locator (2026-09-16), for 14,100 battery-electric cars registered in the state at the end of 2025.
There are 46 registered EVs for every public fast-charging plug in Idaho, a little below the 55 of the typical state — 18th of 51 states, fewest cars per plug first. Plug supply is roughly keeping pace with the cars here.
31% of the sites in Idaho have a single plug and the state averages 3.6 plugs per site — enough that a busy stop usually has another bay, not enough to count on it off the interstate.
Tesla is the largest network in Idaho with 46% of the plugs (142 of 309), the rest split among the other operators — enough competition that price and reliability are not one company decision.
Which plug fits in Idaho
The plug question in Idaho has a clear answer: 80% of the sites carry CCS1, the connector on almost every non-Tesla EV sold in the US, against 27% carrying the Tesla NACS plug. A CCS car has the run of the state; a Tesla is at home on its own network and needs an adapter elsewhere.
| Connector | Sites in Idaho | Share of sites | Cars that use it |
|---|---|---|---|
| CCS1 (J1772 Combo) | 69 | 80% | Almost every non-Tesla EV sold in the US |
| NACS / J3400 (Tesla) | 23 | 27% | Teslas, and other cars with an adapter where the site allows it |
| CHAdeMO | 35 | 41% | Older Nissan Leaf and Mitsubishi only |
CHAdeMO is unusually well represented here: 41% of Idaho’s sites still carry it (35 of 86). That is a legacy of early buildout rather than a live standard — no car sold new in the US takes it, and those bays are worth nothing to a car bought this decade.
Public fast charging does not follow the residential rate. At a typical network price of $0.48 per kWh the median car costs $14.93 per 100 miles — 3.3 times what the same miles cost at home in Idaho, and still under the $15.07 the petrol car spends on them. Anyone charging mostly in public in Idaho should read the home column as optimistic by a factor of 3.3 — that multiple, not the state, is what decides whether the sums work. How long each car takes on a fast charger is on its charging page.
Idaho against its neighbours
Nevada, Utah are cheaper than Idaho; Washington, Oregon, Wyoming, Montana are dearer. Same car in every row, so the columns are comparable: Idaho is cheaper than 4 of the 6 states it touches.
| State | Cents / kWh | Rank | Chevrolet Equinox EV FWD / month | Fast plugs | EVs per plug |
|---|---|---|---|---|---|
| Nevada | 13.11 | 1st | $46 | 1,174 | 73 |
| Utah | 13.37 | 3rd | $47 | 1,009 | 68 |
| Idaho | 14.37 | 10th | $50 | 309 | 46 |
| Washington | 14.91 | 13th | $52 | 2,315 | 102 |
| Montana | 15.14 | 16th | $53 | 258 | 27 |
| Wyoming | 15.24 | 18th | $53 | 169 | 11 |
| Oregon | 16.32 | 26th | $57 | 1,319 | 74 |
How long the charge itself takes does not change with the state, only what it costs: the BYD Seal charging time, Tesla Model 3 charging time and Tesla Model Y charging time are 36, 28 and 27 minutes from 10 to 80 per cent wherever you plug in, and each of those pages runs the same cost arithmetic as this one at the national average rate rather than Idaho’s.
Frequently asked questions
How much does it cost to charge an electric car in Idaho?
$4.47 per 100 miles at home, $50 a month over 1,125 miles, at Idaho’s 14.37-cent rate. Across the database the answer runs from $37 for the Lucid Air Pure RWD to $105 for the GMC Hummer EV Pickup 3X — a narrow spread, because the rate is low.
Is it cheaper to charge an EV than to buy petrol in Idaho?
Yes. At 14.37 cents per kWh the median car costs $50 a month against $170 of petrol for a 27 mpg car at $4.07 a gallon — $119 a month in favour of Idaho, $1,432 a year.
How many fast chargers are there in Idaho?
86 public DC fast-charging sites and 309 plugs in the AFDC locator as of 2026-09-16, for 14,100 registered EVs — 46 cars per plug. Level 2 chargers are not counted here; only DC fast.
Can a non-Tesla use a Tesla charger in Idaho?
Where the site is open to other brands, yes, with the right adapter. 23 of the 86 fast-charging sites in Idaho carry the NACS plug (27%) and 69 carry CCS1 (80%), so a CCS car still has the larger of the two networks to fall back on. The plug on each car is listed on its model page.
Which electric car is cheapest to charge in Idaho?
The Lucid Air Pure RWD, at 23.1 kWh per 100 miles: $3.32 per 100 miles and $37 a month in Idaho. Picking it over the GMC Hummer EV Pickup 3X is worth $68 a month here, which is as much as the Idaho rate ever makes efficiency worth; the full efficiency order is the same in every state.
Sources for the Idaho figures
Electricity price 14.37 cents/kWh: EIA Electric Power Monthly table 5.6.A, June 2026. Sites, plugs and connectors for Idaho: AFDC station locator, public DC fast only, 2026-09-16. A site counts once per connector it carries, so those rows sum above the site total. Registered EVs in Idaho: AFDC registration counts, 2025, battery-electric only. Energy per 100 miles: EPA combined ratings, credited on each car’s page. Mileage, petrol price and the public DC rate are the standing assumptions on the methodology page.