Cost to Charge a Plug-In Hybrid at Home

A plug-in hybrid costs very little to charge, because the thing you are filling is small. A pack in the 8-to-18 kWh range takes a dollar or two of electricity to fill at typical US residential rates, and it does so from an ordinary wall socket overnight. The useful question for a PHEV owner is not what a charge costs - it is what fraction of your miles you can move onto electricity, because that is the number that decides whether the car is cheap to run or an expensive hybrid.

Our cost to charge at homepage covers the full-size battery EV case. A PHEV is a genuinely different calculation, for three reasons: the pack is a fraction of the size, the car falls back to gasoline instead of stopping, and the charging hardware decision usually resolves to "you already own it".

The arithmetic, with nothing hidden

Three inputs: the usable battery size in kWh, your electricity rate in dollars per kWh, and a charging efficiency factor, because some of what the meter records is lost as heat in the car's onboard charger rather than stored. We use 0.90, the same figure as everywhere else on this site.

Cost per full charge = battery kWh / 0.90 x your rate per kWh

Take Toyota's Prius Plug-in Hybrid, whose battery Toyota publishes at 13.6 kWh - a fair mid-point for the class. At 12 cents per kWh that is 13.6 / 0.90 x $0.12 = about $1.81 for a full charge. At 18 cents it is about $2.72. Toyota also publishes the charging times for that car: roughly 11 hours on a standard 120-volt outlet, or about 4 hours on a Level 2 charger.

Those two numbers - under three dollars, and overnight on a household socket - are the whole character of PHEV charging. Scale them for your own car:

Rates vary enormously by state and by time of day, and the US residential average has been running in the high teens of cents per kWh through 2026 in EIA's monthly data. Your own bill is the only rate that matters - put it into the calculator below rather than trusting any average, including ours.

Cost per electric mile, and the comparison that counts

PHEVs are less efficient per mile than dedicated EVs - they are carrying an engine, a fuel tank and a transmission around - so a reasonable working figure is 3.0 miles per kWh rather than the 3.5 we use for battery EVs. That gives:

Cost per electric mile = (1 / 3.0) / 0.90 x your rate

At 12 cents that is about 4.4 cents a mile; at 18 cents, about 6.7 cents. Against gasoline in the same car - say 40 mpg in hybrid mode at $3.50 a gallon - you are paying about 8.8 cents a mile. So electricity is roughly a third to a half cheaper per mile than the car's own gas mode, which is a real saving but not the four-to-one advantage a battery EV has over a 28-mpg gas car. Our EV versus gas page runs that fuller comparison.

Why Level 1 is usually the right answer

This is where PHEV advice diverges sharply from battery-EV advice. The Department of Energy notes that many owners meet their daily range needs by charging overnight on Level 1 equipment, requiring no additional cost or installation, provided there is an outlet on a dedicated branch circuit near where they park. For a full-size EV that is a qualified "sometimes". For a PHEV it is usually just true, because the pack is small enough to refill in a single night at 120 volts - Toyota's own figure of about 11 hours for the Prius Plug-in Hybrid is a normal overnight window.

So the honest hardware recommendation for most PHEV owners is: use the cordset that came with the car, on a dedicated 120-volt circuit, and spend nothing. Three situations change that answer:

• Short dwell times. If the car is home for five hours rather than twelve - two school runs and an evening out - Level 1 cannot refill the pack between trips and Level 2 doubles or triples your electric mile share.
• Two electric cars sharing one outlet. The arithmetic stops working as soon as the socket has to serve two packs a night.
• Cold winters. Cabin heating and battery conditioning eat into a small pack hard, and some of a Level 1 charge goes to keeping the battery warm rather than filling it. See winter charging cost.

Note what is noton that list: wanting the fastest possible charge. A PHEV's onboard charger is modest by EV standards, so a big 48-amp wall unit cannot charge it any faster than a modest one - the car is the limit, not the charger. If you do install Level 2, buy for the car, and read what amp charger do I need first.

What a PHEV adds to your electricity bill

Multiply the per-charge cost by how often you fill it. Charging a 13.6-kWh pack every weekday is roughly 22 charges a month, or about 330 kWh at the wall - which lands somewhere between $40 and $60 a month at the rates in the table above. Against that, you are buying maybe 1,000 electric miles that would otherwise have cost around $88 in gasoline at 40 mpg and $3.50 a gallon.

Two ways to make that bill smaller. Move the charging into an off-peak window if your utility has one - a small pack is the easiest load in the house to shift, and almost every PHEV has a departure-time setting that does it for free. And check whether your utility has an EV rate at all; see off-peak and time-of-use charging and whether you need a separate meter.

The honest summary

Charging a plug-in hybrid at home costs one to three dollars a fill and roughly 4 to 7 cents a mile, against about 9 cents a mile on its own gasoline. You will not need a charger installation to achieve it in most cases. And the single highest-value thing you can do with a PHEV is the simplest: plug it in every single night, because every charge you skip is a charge bought back at gas-station prices.