Cost to Charge an EV at Home vs. Gas in Westminster, CA: The Real Math

The Cost to Charge an EV at Home vs. Gas, in Cents Per Mile

The cost to charge an EV at home almost always beats gas on a per-mile basis, often by three to one or more. The clearest way to compare the two is cents per mile rather than price per gallon or price per kilowatt-hour, because it puts both fuels on the same footing. The U.S. Department of Energy's Alternative Fuels Data Center estimates home charging at about three cents per mile using a low national electricity rate, and even at California's higher prices an EV typically lands between six and eight cents a mile. A gas car in this area runs closer to fifteen to twenty cents a mile. Part of that gap is physics: electric vehicles convert over 77 percent of the energy from the grid into motion, while gasoline engines manage only about 12 to 30 percent, according to fueleconomy.gov. The rest is the price of the fuel itself, and that is where your SCE rate plan and California pump prices decide how big your savings really are.

What a Kilowatt-Hour Buys for Your EV

A kilowatt-hour is the unit you pay for, and a typical EV travels three to four miles on each one. The Alternative Fuels Data Center uses roughly 27 kilowatt-hours per 100 miles as a working figure, which means a full charge of a 54 kWh battery with about 200 miles of range costs around $6 at a low electricity rate. To translate that to Westminster, multiply your car's energy use by your own rate. At 27 kWh per 100 miles and a Southern California Edison off-peak price near 25 cents, 100 miles costs about $6.75, or just under seven cents a mile. Larger trucks and SUVs use more, closer to 35 to 40 kWh per 100 miles, which pushes the number up. The point is that the arithmetic is simple and public: your kWh per mile comes off the car's display or window sticker, and your price per kWh comes off your SCE bill. Multiply the two and you have your true charging cost, no estimate required.

Your SCE Rate Plan and the Cheapest Time to Charge

When you charge matters as much as how much you charge, because Southern California Edison prices electricity by time of day. On the EV-focused TOU-D-PRIME plan, off-peak power runs about 25 cents per kilowatt-hour in summer and 24 cents in winter, while peak pricing from 4 to 9 p.m. climbs to 55 cents in summer. The counterintuitive part for many drivers is that SCE's cheapest window is the middle of the day, not the middle of the night: the utility advises charging between 8 a.m. and 4 p.m., when solar floods the grid, and avoiding the 4-to-9 p.m. block entirely. A programmable charger or your car's own scheduler makes this automatic. Charging on a flat rate or during peak hours can erase much of the EV advantage, so matching your charging schedule to your rate plan is the single biggest lever you control. For reference, the U.S. Energy Information Administration pegs California's average retail electricity price at about 27 cents per kilowatt-hour, so an EV plan with a low off-peak rate is worth having.

What the Same Miles Cost in Gas

Gasoline in California is the most expensive in the country, which widens the gap in an EV's favor. The U.S. Energy Information Administration reported California's average regular gasoline price at about $6.20 per gallon in early October 2026, well above the national average near $4.35. A gas car averaging 30 miles per gallon therefore costs roughly 21 cents a mile to fuel here; a thirstier SUV at 22 mpg is closer to 28 cents. Even an efficient hybrid at 45 mpg still runs about 14 cents a mile. Set those against an EV's six to eight cents and the difference is stark: every 100 miles costs a gas driver around $20 and an EV driver around $7. Unlike gas prices, which swing with refinery issues and seasonal blends, your overnight electricity rate is stable and predictable.

Monthly and Yearly Savings for a Westminster Driver

For a typical commuter, switching from gas to home charging saves on the order of $100 a month or more. Take a driver covering about 1,000 miles a month, a little under the California average. In a 30-mpg gas car at roughly $6 a gallon, that is about $200 a month in fuel. The same miles in an EV charged off-peak on an SCE EV plan cost about $65 to $75. That is a monthly saving of roughly $125, or about $1,500 a year, and the gap grows for higher-mileage drivers or anyone replacing a truck. These figures use the market rates cited above rather than any one household's bill, so treat them as a realistic range, not a quote. The savings also stack with lower maintenance, since EVs skip oil changes and have fewer wearing parts.

What Changes Your Real Charging Cost

Your actual cost swings with four things: your car's efficiency, the weather, your rate plan, and your home's wiring. Cold snaps and summer air-conditioning both pull more energy per mile, and very hot or cold days can noticeably raise consumption. Short trips in stop-and-go Little Saigon traffic are gentler on an EV than on a gas car, which burns most at low speeds. The equipment matters too: a Level 2 charger delivers a full charge overnight and makes it easy to hit the cheap off-peak window, where a slow Level 1 cord may force you into pricier hours. Many of Westminster's 1950s-to-1970s homes still run 100-amp panels, and adding a 240-volt EV circuit to a nearly full panel sometimes calls for an electrical panel upgrade before charging is safe and reliable. Getting the install right is what lets a Westminster EV charger owner actually capture the low per-mile cost the math promises.

Key Takeaways

• Charging an EV at home in Westminster typically costs six to eight cents per mile, versus roughly 15 to 21 cents per mile for gas.
• The U.S. Department of Energy estimates home charging near three cents per mile at low electricity rates, and California rates push that into the high single digits.
• On SCE's TOU-D-PRIME plan the cheapest power is midday, from 8 a.m. to 4 p.m., not overnight, and the 4-to-9 p.m. window is the most expensive.
• At about $6 a gallon in California, a 30-mpg gas car costs roughly $200 a month to fuel for 1,000 miles; the same miles in an EV run about $65 to $75.
• Your real cost depends on your car's efficiency, the weather, your rate plan, and whether your panel can support a Level 2 charger.

Frequently Asked Questions

Sources

• AFDC - Electricity for Home Charging (U.S. Dept. of Energy)
• fueleconomy.gov - All-Electric Vehicles (U.S. DOE/EPA)
• Southern California Edison - Electric Vehicle Plans (TOU-D-PRIME)
• U.S. Energy Information Administration - California Electricity Profile
• U.S. Energy Information Administration - Gasoline and Diesel Fuel Update