What is the Ofgem price cap and how does it affect EV charging at home?

The Ofgem price cap sets a limit on the maximum unit rates and standing charges suppliers can charge customers on standard variable tariffs (and default tariffs). It doesn’t cap your total bill, but it influences how much you pay per kWh and per day. For EV owners, this impacts the cost of charging at home—especially if you charge on a standard variable tariff rather than an EV or off-peak tariff.

Does the price cap apply to fixed tariffs or EV tariffs?

The price cap applies to default/standard variable tariffs, not to fixed-term deals. Many EV tariffs are fixed or time-of-use tariffs, so their rates can differ from the cap. It’s still important to compare the full tariff details (unit rates by time band and standing charge) to understand your real charging costs.

How often does the Ofgem price cap change?

Ofgem reviews and updates the price cap periodically (typically every three months). When it changes, suppliers may update prices for customers on default tariffs. EV owners who rely on standard rates should check their unit rate and standing charge when a new cap period starts.

Is an EV tariff better than a standard variable tariff under the price cap?

Often, an EV or time-of-use tariff can reduce charging costs because it offers cheaper off-peak electricity for a set window (for example, overnight). Whether it’s better depends on your driving/charging habits, how much electricity you use at peak times, and the tariff’s standing charge. Comparing your expected monthly usage is the quickest way to see potential savings.

Do I need a smart meter to access EV off-peak rates?

In most cases, yes. Time-of-use and EV tariffs typically require a smart meter so your supplier can measure electricity use by time band (peak vs off-peak). If you don’t have one, check the tariff requirements and consider arranging a smart meter installation if it helps you access lower overnight charging rates.

How can I estimate the cost to charge my EV under the price cap?

To estimate home charging cost, multiply your electricity unit rate (p/kWh) by the kWh you add to your battery. For example, adding 30 kWh costs 30 × your unit rate. If you use an EV tariff, use the off-peak unit rate for energy charged in the off-peak window. Your standing charge is separate and applies daily regardless of charging.

Can the price cap go down as well as up?

Yes. The cap can increase or decrease depending on wholesale energy costs and other factors Ofgem considers. If you’re on a default tariff, your rates may move with the cap each period. If you’re on a fixed tariff, your rates usually stay the same for the fixed term.

What’s the quickest way to reduce EV charging costs if prices rise?

The biggest savings usually come from shifting charging to cheaper off-peak hours on a time-of-use/EV tariff, using scheduled charging (via your car or charger), and avoiding peak-rate top-ups where possible. It can also help to compare tariffs and check whether a tariff with a slightly higher standing charge is worth it for a much lower off-peak unit rate.

Where can I compare tariffs or get help choosing the right option for EV charging?

You can explore Energy Plus resources and tariffs to find an option that fits your EV charging routine and household usage. Start here: https://www.energyplus.co.uk/

Ofgem Price Cap guide for EV owners (UK)

Understand what the Ofgem price cap does (and doesn’t) mean for EV charging costs, and how to compare EV-friendly tariffs safely—especially if you have (or want) an EV charger or smart meter.

Clear explanation of the cap vs your actual bill (standing charge + unit rates + usage)
How EV tariffs (incl. off-peak) sit alongside the cap—plus common pitfalls
Two realistic charging scenarios with estimated numbers and assumptions

Compare EV-friendly energy deals How the price cap works

Figures are illustrative and change by region, meter type and payment method. Always check your tariff details and your supplier’s current rates.

Fast answer: what the Ofgem price cap means for EV charging

The Ofgem price cap limits the maximum a supplier can charge most households on standard variable tariffs (SVTs) and some default tariffs. It’s not a cap on your total bill and it doesn’t automatically give you the cheapest EV charging.

If you mainly charge overnight, an EV-friendly time-of-use tariff (often requiring a smart meter) can be cheaper for charging even when the daytime rate is higher—but standing charges, peak rates, and eligibility rules matter.

Key takeaways for UK EV owners

The cap is set by region, payment method, and meter type (e.g. credit vs prepay; single-rate vs Economy 7). Your rates may differ from headline figures.
EV tariffs aren’t “exempt” from the cap—many are fixed or time-of-use products, so the cap isn’t the direct price you pay.
Off-peak rates can help if you can reliably charge in the cheap window and shift other usage (dishwasher, immersion, heat pump) where practical.
Standing charge matters more than many people think, especially if your mileage is low or you have solar/battery and buy less from the grid.
Watch exit fees and contract length on fixed deals—switching again later may cost money.

How the Ofgem price cap actually works

The cap sets a limit on the unit rates (p/kWh) and the standing charge (p/day) suppliers can charge customers on default tariffs. Ofgem reviews and updates the cap periodically.

Why your EV charging cost doesn’t match the “cap figure”

It’s not a cap on your bill: You pay based on how many kWh you use. More driving and home charging means a higher bill even if rates are capped.
Rates vary by where you live: Standing charges and unit rates differ across UK network regions. A tariff that looks good nationally may be less competitive in your area.
Meter type and payment method change the cap level: Prepayment meters (PPM), single-rate, and Economy 7 have different cap values and often different standing charges.
EV tariffs may be fixed or time-of-use: Many EV deals use cheap off-peak windows with higher peak rates. Your “average” price depends on when you charge and how you use electricity the rest of the day.

EV owners often benefit from comparing tariffs using their likely charging pattern (e.g. “10pm–6am charging, 4 nights per week”) rather than looking only at headline unit rates.

Compare EV-friendly tariffs (whole of market)

Tell us a few details and we’ll show tariffs that may suit EV charging—based on your area, meter type and preferences.

Tip for EV owners: if you know your rough monthly miles and typical overnight charging times, keep it handy—those details help you judge whether a time-of-use deal is genuinely suitable.

Two realistic EV charging scenarios (with estimated numbers)

These examples show how the same EV can cost very different amounts to charge depending on when you charge and your tariff structure. They’re simplified to help you compare—real bills include standing charges and other household electricity use.

Scenario A: Mostly overnight charging on an EV time-of-use deal

Monthly driving: 800 miles (typical commuter + errands)
Efficiency assumption: 3.5 miles per kWh (mid-range EV, mixed driving)
Energy needed: 800 ÷ 3.5 ˜ 229 kWh/month
Off-peak unit rate (example): 9p/kWh (supplier/product varies)

Estimated EV charging cost: 229 kWh × £0.09 ˜ £20.61/month

If some charging spills into peak hours, your cost rises quickly. Standing charges and peak/day rates still apply to the rest of your home usage.

Scenario B: Flexible charging on a capped standard variable tariff (SVT)

Monthly driving: 800 miles
Efficiency assumption: 3.5 miles per kWh
Energy needed: ˜ 229 kWh/month
Single-rate unit rate (example): 28p/kWh (varies by region and cap period)

Estimated EV charging cost: 229 kWh × £0.28 ˜ £64.12/month

This can be simpler if you can’t reliably charge off-peak. But it may be more expensive for EV charging than an EV tariff if you can use the cheap window.

Assumptions used above: home charging only, no public charging costs, no battery losses. Real-world charging losses can add roughly 5–15% depending on charger, temperature and charging speed.

EV tariffs vs standard tariffs: what to compare (quick table)

Use this to sense-check whether an EV deal is likely to suit you before you switch. Always confirm your supplier’s exact hours, rates and eligibility.

Tariff type	How pricing works	Best for	Watch-outs
SVT (price-capped)	Single unit rate + standing charge within cap limits	Simplicity; people who can’t target off-peak charging	Often not cheapest for heavy overnight charging; rates can change when cap updates
Fixed single-rate	Same rate day/night for an agreed term	Price certainty if you prefer predictable rates	Exit fees; may be above future SVT levels; not optimised for EV charging
Time-of-use EV tariff	Very low off-peak window + higher peak rate(s)	EV owners who can charge reliably in set hours	Usually needs smart meter; peak rates can raise costs if you can’t shift usage
Economy 7 / two-rate	Two rates: day + night (longer night window than some EV deals)	Night charging and overnight appliances; some storage heating setups	Day rate often higher; night hours vary by region/meter; not always best for EV vs modern EV tariffs

Decision checklist: who an EV time-of-use tariff suits (and who it doesn’t)

Likely to suit you if…

You can charge mostly overnight in the cheap window (set schedules or smart charger).
You have (or can get) a smart meter and stable mobile signal/Wi-Fi where required.
Your household can shift some usage off-peak (laundry, dishwasher, immersion).
You drive enough miles that cheaper charging makes a meaningful difference.

May not suit you if…

You regularly need to charge at peak times (e.g. short turnaround, shift work) and can’t use scheduled charging.
Your home uses a lot of electricity in the evening peak (electric cooking, tumble dryer, gaming/streaming) and can’t shift it.
You’re on prepayment (EV deals are more limited; eligibility varies).
You’re worried about exit fees because you may move home soon.

Costs, exclusions and common pitfalls (EV owners)

A tariff can look “EV-friendly” but still be poor value if these details don’t fit your household.

1) Standing charges can outweigh savings

If you don’t use many kWh (low mileage EV, good insulation/solar), a higher standing charge can reduce the benefit of cheap off-peak rates.

2) Peak rates may be much higher

Some EV tariffs have expensive daytime/evening rates. If you can’t shift normal household use, your overall bill may rise even if charging is cheap.

3) Smart meter and eligibility requirements

Time-of-use billing typically needs a smart meter. Some products require a compatible smart charger or app-based control. Terms vary by supplier.

4) Economy 7 timings are not universal

Night hours can differ by region/meter (and can shift with clock changes). Confirm your meter’s switching times before relying on night charging.

5) Exit fees and contract terms

Fixed EV tariffs may have exit fees. If prices fall or you move home, switching again could cost you. Always check tariff information before applying.

6) Public charging is priced separately

The Ofgem cap is about household supply (your home electricity/gas). Rapid and public charging costs depend on the network and are often much higher per kWh.

If you rent: you can usually switch energy supplier, but your ability to install a home charger may depend on your tenancy agreement, off-street parking, and permissions. Switching tariffs doesn’t require a charger—but it can affect how easy it is to use off-peak windows.

FAQs: Ofgem price cap and EV charging

Does the Ofgem price cap make EV charging cheaper?

Not directly. The cap limits rates on SVTs/default tariffs. Your EV charging cost still depends on your unit rate, standing charge, and how many kWh you use. An EV time-of-use tariff might be cheaper for charging if you can use the off-peak window.

Am I on the price cap if I’m on a fixed deal?

Fixed tariffs aren’t set by the cap in the same way as SVTs. Your prices are defined by your contract. If you’re unsure, check your latest bill or your online account: it will usually state “fixed”, “standard variable” or “default”.

Do EV tariffs work without a smart meter?

Often no. Many time-of-use EV tariffs require half-hourly readings from a smart meter to apply off-peak/peak rates accurately. Some two-rate options (like Economy 7) can work without a smart meter, depending on your meter setup.

If I switch tariff, will I pay exit fees?

Possibly. SVTs typically don’t have exit fees, but fixed tariffs often do. Always check your tariff information label (or supplier terms) for any early termination charges before switching.

Is Economy 7 automatically good for EV owners?

Not automatically. Economy 7 gives a cheaper night rate and a higher day rate. It can work well if you charge mostly overnight and can keep daytime usage under control. But modern EV tariffs may offer a cheaper (or shorter) off-peak window, and standing charges can differ.

I’m on a prepayment meter—can I get an EV tariff?

Options can be limited and eligibility varies by supplier. Some EV time-of-use products require credit billing and a smart meter. If you’re on PPM, it’s still worth comparing: you may find a better-value tariff or a route to move to credit (subject to supplier checks).

Will my region affect how good an EV deal is?

Yes. Standing charges and unit rates vary by distribution network region, so the same tariff can cost different amounts depending on your postcode. That’s why comparisons should be postcode-based.

Does the cap cover gas too, and does that matter for EV owners?

Yes, the cap applies to gas SVTs/defaults as well. It matters if you’re comparing dual fuel, or if your home has high electricity demand (EV/heat pump) and you’re considering moving away from gas. Compare both fuels together to avoid an “electricity win” that’s offset by higher gas costs.

Trust, methodology and transparency

Written by: EnergyPlus Editorial Team

Reviewed by: Energy Specialist

Last updated: March 2026

How we assess “good for EV owners”

When we explain EV tariffs and the price cap, we focus on what changes your real cost to charge:

Total cost drivers: standing charge + unit rates at the times you use energy.
Charging pattern fit: ability to charge in off-peak windows (and how strict those windows are).
Eligibility and friction: smart meter requirements, app/smart charger requirements, credit/PPM restrictions.
Risk factors: exit fees, contract length, and exposure to cap updates if on SVT.

Limitations (what this guide can’t do)

We can’t state a single “best” tariff for everyone—rates and standing charges vary by postcode and change over time.
We don’t know your exact EV efficiency, charging losses, or whether you’ll always hit the off-peak window.
Public charging prices are separate from home energy tariffs and aren’t covered by the Ofgem cap.

Sources (UK)

Editorial independence: this guide is written to help you understand the market and ask the right questions. Always confirm tariff details on the supplier’s tariff information label and your contract.

Ready to check EV-friendly tariffs for your postcode?

Compare whole-of-market options and see which deals may suit your charging pattern. Rates, eligibility and exit fees vary—always review the details before switching.

Get my energy quote Re-read the key takeaways

Note: the secondary button above is intentionally low-friction. If you’d rather not submit details yet, use the table and checklist to narrow down what “good” looks like for your home.

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Updated on 19 Mar 2026