"Charge overnight" is the advice everyone gives, and it is not wrong, but it is not specific enough to save you real money. Overnight covers ten hours on some utilities and four on others. One plan might price your cheapest window at 2 cents a kilowatt-hour; another might barely undercut the daytime rate. The only way to know what you are actually paying is to look up your own utility's schedule, not the national average. Here is how to do that, what changes when the plan is EV-specific rather than whole-house, and the one tradeoff that pure cost-chasing schedules get wrong on cold mornings.
Step 1: Find out if your utility has a residential TOU or EV-specific rate at all
Not every utility offers one, and among those that do, the plan is either opt-in or requires enrollment. Start with your utility's rate plans or billing page, search for "time-of-use" or "EV rate," and check three things: whether it is available to your account type, whether it requires a smart meter you may not already have, and whether switching is free or reversible. Most utilities let you enroll online in a few minutes and switch back later if the math doesn't work out.
evcharginghelp.com's own utility and state pages already carry this lookup for 129 utilities and every state, with the plan name, peak and off-peak windows, and current rates pulled from the tariff itself. Three real examples show how differently these plans are built.
Georgia Power's Overnight Advantage (TOU-OA): peak runs 2pm to 7pm on summer weekdays only (June through September, excluding holidays); every other hour, including all of fall, winter, and spring, is off-peak. Within that, Super Off-Peak from 11pm to 7am prices at roughly 2.19 cents per kWh, against a summer peak of about 29.79 cents. That is a rate plan built around a narrow, seasonal peak, not a fixed daily window.
Consumers Energy's Nighttime Savers (RPM_1050) in Michigan: Super Off-Peak runs 11pm to 6am on weekdays and all day on weekends, at 14.1 cents per kWh in winter and 18.7 cents in summer; on-peak (2pm to 7pm weekdays) runs up to 16.9 cents winter and 24.5 cents summer. The gap between peak and off-peak is real but far narrower than Georgia Power's, because Michigan's overall rates sit closer together across the day.
California's standardized peak window: PG&E's EV2-A, Southern California Edison's TOU-D-PRIME, and San Diego Gas & Electric's EV-TOU-5 all set peak hours at 4pm to 9pm every day of the year, a rule the state's major investor-owned utilities converged on. PG&E's off-peak window is 12am to 3pm. SCE's off-peak is broader than a simple overnight band: it covers all hours outside that 4pm-9pm peak, with an extra-cheap winter super off-peak sub-window from 8am to 4pm layered on top. Rates on these plans run roughly 23 to 26 cents per kWh off-peak, well above Georgia Power's or Consumers Energy's off-peak rates in absolute terms; the California savings come from avoiding the 4pm-9pm peak (which runs meaningfully higher still), not from an unusually cheap off-peak hour.
The takeaway: there is no substitute for reading your own plan. A schedule copied from a friend in another state, or a generic "charge after 9pm" rule, can miss your actual off-peak window by hours, or miss that your cheapest tier only exists in a narrow overnight band.
Step 2: Understand whether the rate is whole-house or EV-only
This is the detail that generic TOU advice skips, and it changes what "switching" actually means for your bill.
Most of the newer EV-oriented rates, including all three examples above, are whole-house plans: every kilowatt-hour your home uses, not just your charger, bills at the time-of-use schedule. PG&E's EV2-A tariff explicitly applies to "residential customers with a registered EV or PHEV on a single whole-house meter." That means your dishwasher, your air conditioner, and your charger are all subject to the same peak and off-peak pricing, for better or worse. It rewards households that can shift laundry and other discretionary use to the cheap window, and it penalizes ones that can't avoid using power during peak hours for reasons that have nothing to do with the car.
Some older EV rate designs work differently. Con Edison in New York offers a whole-house time-of-use option (SC1 Rate III, with an unusually wide 8am-to-midnight peak window and off-peak reserved for midnight to 8am), and separately lets customers install a second, dedicated meter that measures only the EV charging circuit on its own time-of-use schedule, for an additional $20 monthly customer charge. That second meter is a way to isolate charging costs from the rest of the home's electricity use without moving the whole house onto a TOU schedule. Con Edison's SmartCharge New York program, a separate managed-charging bill credit covered in our utility rebates roundup, pays for shifting charging into that same midnight-to-8am window and can be combined with the whole-house SC1 Rate III plan rather than forcing a choice between the two. Which combination is worth it, whole-house TOU, the second meter, SmartCharge alone, or SmartCharge stacked with TOU, depends on how much of the rest of the home's usage can shift off-peak, which is exactly the kind of detail that only shows up once you read your specific utility's rate sheet rather than a general explainer.
Before enrolling, check which structure your utility offers. If it is whole-house, model your total consumption pattern, not just the charger, before assuming the switch saves money. If a second-meter option exists, compare its fixed monthly cost against what it isolates.
Step 3: The real tradeoff, TOU savings versus a cold, unprepared car
Here is the part that pure cost-chasing advice gets wrong. If you set your charger or car to only charge during the cheapest hour and to stop the moment that window ends, say 6am when your off-peak rate expires, your battery and cabin can sit at ambient temperature for however long passes between the charge finishing and you actually leaving. In winter, that means walking out to a cold cabin and a cold battery, which is a separate problem from the "does cold weather slow charging" question (it barely does at Level 2 home charging rates; see our cold-weather charging breakdown for the physics and the range-loss numbers). This is about timing, not charging speed: a charge that finishes too early leaves the car un-preconditioned.
The fix most EVs already support is a scheduled-departure feature, not just scheduled charging. Tesla's Scheduled Departure combines Off-Peak Charging (which delays the session so it still finishes within your off-peak window) with Preconditioning (which warms the cabin and battery on grid power in the minutes before your set departure time). Tesla's documented guidance on the feature goes further: if the car finishes charging well before departure, the battery cools back down and then has to be rewarmed using stored energy, so the recommendation is to let the charge run until closer to departure rather than finishing as early as possible. Ford's equivalent, Scheduled Departure in the FordPass app, does the same thing: it lets the vehicle use grid power to warm the battery and cabin while still plugged in, so the driver starts with a warm car without spending range on it.
The distinction that matters: plain "charge during off-peak hours" scheduling optimizes for the lowest electricity price and nothing else. Scheduled-departure features optimize for being ready, warm, and charged by a specific time, using off-peak pricing where possible but not sacrificing pre-drive comfort to save the last few cents. If your EV or charger offers both options, use the departure-time version rather than a flat off-peak-only schedule, especially once the weather turns cold. If your vehicle doesn't have a departure-time feature, the practical workaround is to leave the car plugged in past the point charging completes, so any built-in preconditioning still pulls from the wall instead of the battery.
Putting it together
- Look up your own utility's TOU or EV-specific rate plan, not a generic rule of thumb; evcharginghelp.com's utility and state pages have the current windows and rates for 129 utilities.
- Confirm whether the plan is whole-house or requires a separate EV-only meter, and weigh any fixed monthly charge for the second-meter option against what it isolates.
- Set a schedule that targets your actual off-peak window, which might be a narrow overnight band or a wide everything-but-a-few-hours window depending on your utility.
- Use scheduled departure rather than plain off-peak charging if your vehicle supports it, so the cheapest hours don't come at the cost of a cold car in the morning.
- Revisit the math once a year. Utilities adjust these tariffs on regulatory schedules, and a rate that wasn't worth switching to last year can change.
None of this requires new hardware. It requires ten minutes on your utility's website and a look at your charger or car's scheduling settings, and it is the difference between generic "charge overnight" advice and actually capturing the savings your specific utility is offering.
Last factually verified: September 16, 2026, against evcharginghelp.com's own utility content files for Georgia Power (Overnight Advantage/TOU-OA, verified against Georgia Power's tariff filing on 2026-09-01), Consumers Energy (Nighttime Savers/RPM_1050, verified against consumersenergy.com on 2026-09-01), Pacific Gas and Electric and Southern California Edison (EV2-A and TOU-D-PRIME peak and off-peak windows, verified 2026-08-31 and 2026-09-01 respectively), and Consolidated Edison (SC1 Rate III, the second-meter EV option, and SmartCharge New York, verified 2026-07-13). The specific off-peak cents-per-kWh figures for PG&E EV2-A and SCE TOU-D-PRIME are carried over from our own what home charging actually costs article, corrected there on 2026-08-11 against those utilities' published rate materials rather than independently re-verified for this piece; the underlying per-kWh fields in our own utility content files are not yet populated for these two plans, so treat those specific dollar figures as carried-over rather than freshly confirmed, and the windows (not the cents) as this article's own verification. Tesla's Scheduled Departure and Ford's Scheduled Departure feature descriptions were confirmed via search-indexed summaries of tesla.com's owner's manual and ford.com's support pages respectively, since direct access to both domains was blocked to this session's network, each cross-checked against a second independent description of the same feature before use. evcharginghelp.com is editorially independent and receives no compensation from any company mentioned.