EV charging cost optimization

The best way to minimize your household electricity expenses from an electric vehicle (EV) is to charge automatically during your utility's cheapest electricity hours, while ensuring your car is ready when you need it. This is called smart charging or time-of-use (TOU) charging. The U.S. Department of Energy confirms that shifting charging to off-peak periods can reduce charging costs.afdc.energy.gov+1

Here’s how to set it up, including options that may be relevant if you live in Virginia.

1. Find your cheapest electricity hours

First, check your electric bill or utility account for your current rate plan. There are three common possibilities:

• Flat rate: Electricity costs roughly the same per kWh throughout the day. Scheduling still helps with some utility programs, but the savings may be limited.
• Time-of-use rate: Electricity costs less during designated off-peak hours, often overnight.
• Dynamic pricing: The price varies with market conditions, so the cheapest hours can change from day to day.

Look for the price per kWh, off-peak hours, seasonal schedules, and any extra charges before changing plans. The Department of Energy recommends comparing your actual usage and rate options rather than assuming a TOU plan will automatically save money.afdc.energy.gov+3

2. Set up scheduled charging

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Option A: Use your car's app

Open your vehicle's charging settings and look for Scheduled Charging, Departure Time, or Off-Peak Charging. Set your departure time, desired battery level, and preferred charging window.

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Option B: Use a smart home charger

If your car doesn't support scheduling, use a compatible Wi-Fi-connected charger with a charging schedule. Some models can optimize charging automatically using electricity-price data.

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Option C: Use your utility's EV program

Check whether your electricity provider offers managed charging, off-peak incentives, or a compatible charger program. Compare any enrollment requirements and rewards before signing up.

A good starting configuration: Plug in when you get home, schedule charging for the cheapest eligible hours, and finish shortly before your usual departure. Set a battery limit appropriate for your daily driving needs and vehicle manufacturer's guidance.

3. If you're in Virginia, check Dominion Energy's rates

Dominion Energy Virginia offers an optional Off-Peak Plan for residential customers with smart meters. Its pricing varies by season and time of day.cdn-dominionenergy-prd-001.azureedge.net

For example, Dominion's published summer weekday rates are:

Super off-peak

Midnight–5 a.m., summer weekdays

13.31¢/kWh

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On-peak

3–6 p.m., summer weekdays

31.01¢/kWh

Published summer weekday energy prices. Other seasons, weekends, holidays, and applicable bill charges differ. Verify current prices with Dominion before making changes.cdn-dominionenergy-prd-001.azureedge.net

The same plan lists a basic residential rate typically around 16–18¢/kWh, regardless of time. That means a TOU plan could save money on EV charging but might increase the cost of running other household appliances during peak periods. Compare the whole bill, not just the car's charging cost.cdn-dominionenergy-prd-001.azureedge.net

One important detail: Dominion's Off-Peak Plan eligibility excludes customers enrolled in certain demand-response programs, including EV Charging Rewards. Check compatibility before switching.cdn-dominionenergy-prd-001.azureedge.net

4. Estimate your potential savings

Try this simple calculator to estimate how much shifting your charging could save.

Home EV charging per month

kWh

Slider

Current value unavailable.

Range: 50 to 800

Step: 25

Scale labels: 50 — 50 · 400 — 400 · 800 — 800

Current electricity rate

¢/kWh

Slider

Current value unavailable.

Range: 0.08 to 0.35

Step: 0.01

Scale labels: 0.08 — 8¢ · 0.2 — 20¢ · 0.35 — 35¢

Cheaper charging rate

¢/kWh

Slider

Current value unavailable.

Range: 0.05 to 0.25

Step: 0.005

Scale labels: 0.05 — 5¢ · 0.15 — 15¢ · 0.25 — 25¢

Charging shifted to cheaper hours

%

Slider

Current value unavailable.

Range: 0 to 100

Step: 10

Scale labels: 0 — 0% · 50 — 50% · 100 — 100%

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Estimated monthly savings

Estimated annual savings

Illustrative calculation, assuming the selected rates apply to the shifted energy. Excludes plan fees, taxes, delivery-charge differences, and any additional household costs. Savings may be zero or negative if the cheaper rate isn't actually lower.

5. Fine-tune for maximum savings

• Avoid peak hours: Don't start charging as soon as you arrive home if those are expensive hours.
• Charge only what you need: You may not need to recharge to 100% every night.
• Keep a departure-time override: Ensure you can charge immediately when you need an unexpected trip.
• Review your bill after a month or two: Compare total household costs, not just the EV's energy usage.
• Avoid unnecessary hardware purchases: Try your car's built-in scheduling first.

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Let me tailor this to your setup

The most useful next step is to identify your exact utility rate and vehicle charging controls.

1. Who supplies your electricity?

Dominion Energy Virginia

NOVEC

A different utility

Not sure

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2. What car do you drive?

[Input placeholder: e.g., Tesla Model Y, 2025] (Current value unavailable.)

3. How do you charge at home?

240V Level 2 smart charger

Standard 120V outlet

Not sure

4. What rate plan are you on?

Flat/basic residential rate

Time-of-use rate

Not sure

[Find my best charging setup]

Yes. Managed EV charging is one of the simplest ways to reduce the electricity cost of an EV—especially if your utility offers time-of-use (TOU) or EV-specific rates. The basic idea is to make the car wait to charge until electricity is cheapest, while still reaching your required state of charge before you leave.

The U.S. Department of Energy specifically recommends scheduling EV charging during lower-cost periods and notes that smart charging can respond to changing rates and household/facility loads.www.energy.gov

A good charging strategy

1. Find your utility's actual rate periods.
   Don't assume "overnight" is always cheapest. Some utilities have several tiers, seasonal schedules, or EV-specific rates. DOE recommends looking at your bill and interval usage data when evaluating rates.www.energy.gov+1

2. Set a departure-time target rather than charging immediately.
   For example, if you plug in at 6 PM and leave at 7 AM, have the car wait until the cheapest overnight period and finish shortly before 7 AM.

3. Avoid peak-price hours.
   If your utility has a 4–8 PM peak, for example, charging at 6 PM can be considerably more expensive than delaying it until later.

4. Use the car/charger's scheduled-charging feature.
   Most modern EVs and Level 2 chargers can specify a start time, departure time, or charging window. Smart charging can go further by adjusting charging based on electricity prices and household load.www.energy.gov+2

5. Don't automatically switch to a TOU plan.
   A TOU plan can save an EV owner money, but if you use lots of electricity during the plan's expensive periods—HVAC, electric water heating, cooking, laundry, etc.—the higher peak rates can outweigh the EV savings. DOE recommends comparing the whole household's load rather than EV charging alone.www.energy.gov+1

If you're in Virginia

This is particularly worth investigating. Dominion Energy Virginia currently offers an Off-Peak Plan and specifically says it can reduce costs by shifting EV charging and other electricity use to cheaper periods.www.dominionenergy.com

Dominion also has an EV-specific charging tariff, so the best option depends on your household consumption and EV usage rather than simply picking whichever rate has the lowest overnight kWh price.www.dominionenergy.com

How much could you save?

The calculation is straightforward:

Monthly charging cost = EV kWh/month × effective electricity price/kWh

For example, suppose you use 300 kWh/month to charge:

Moving from $0.30 to $0.12/kWh would save $54/month, or about $648/year, assuming the rest of the rate structure doesn't change.

One important wrinkle: TOU plans can create a rush of EV charging right when the cheap period begins, and some utilities design rates to avoid that effect. www.energy.gov So an intelligent schedule that spreads charging across the low-cost window can be better than simply telling every appliance and the EV to turn on at the exact same time.

If you tell me your utility, EV model, approximate miles driven per month, and whether you charge at home with Level 1 or Level 2, I can look up the current rates and work out a specific cheapest charging schedule and estimated monthly/yearly savings for you.