Cheapest electricity tariff for a home battery in the UK

Find the best-value electricity tariff for charging a home battery—based on your meter type, region and how you use (and export) energy. Compare whole-of-market options and get a quote in minutes.

  • Battery tariffs are usually cheapest when you can charge off-peak (e.g., EV-style time-of-use rates).
  • Your “cheapest” option depends on import and export rates, standing charge, and whether you can shift usage.
  • We explain the trade-offs (price caps, smart meters, exit fees) and show worked examples with numbers.
Compare battery-friendly tariffs How to choose (5-minute guide)

Estimates only. Eligibility and prices vary by supplier, region, meter type (smart vs traditional), and payment method. Always check tariff terms, export arrangements and exit fees.

Fast answer: which tariff is usually cheapest for a home battery?

In the UK, the cheapest electricity tariff for a home battery is often a time-of-use (TOU) tariff that gives a low off-peak import rate (typically overnight) so you can charge your battery cheaply. But “cheapest” can change once you include:

  • Your export setup (SEG export rate, or supplier-linked export tariffs if you have solar)
  • Standing charge (can outweigh cheap unit rates for low users)
  • Peak rate (some TOU tariffs are much higher at peak times)
  • Meter type (most TOU tariffs need a smart meter with half-hourly readings)
  • How much load you can shift (battery size, inverter limits, and household routines)

Good rule of thumb: If you can reliably charge the battery off-peak and cover your peak household use from the battery, TOU tariffs tend to win. If you can’t shift much, a competitive single-rate tariff can be better (and simpler).

Key takeaways (quick checklist)

Cheapest for many battery owners

TOU tariffs with a clear off-peak window (often 4–7 hours). Best if your battery can charge within that window.

Cheapest for low shifters

Strong single-rate tariffs can win when you use little electricity at peak or can’t schedule battery charging.

Cheapest with solar + export focus

Look at import + export together. A higher export rate can offset a slightly higher import cost (depending on your generation).

Compare battery-friendly tariffs (whole of market)

Tell us a few basics and we’ll match you to tariffs that suit home batteries—based on availability in your area and how you pay. You’ll see options that may include time-of-use rates, single-rate tariffs, and export-aware choices.

Best for

  • Smart meter households
  • Battery charging overnight
  • Solar + battery setups

We’ll ask about

  • Postcode and payment type
  • Smart meter status
  • Solar/export (optional)

Important: Some “battery tariffs” are marketed as EV tariffs and can still be suitable for batteries. Eligibility often depends on smart meter capability and agreeing to half-hourly readings.

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How to pick the cheapest electricity tariff for a home battery

  1. Confirm your charging window. Can your battery fully (or mostly) charge during the off-peak hours offered? Check battery capacity (kWh) and charge rate (kW).
  2. Estimate how much peak electricity you can avoid. The more you can run from the battery during expensive hours, the more TOU tariffs tend to pay off.
  3. Compare standing charge and peak rates. A very low night rate can be paired with a high day rate. Standing charge differences can also be material.
  4. If you export, include export rates. A tariff with slightly higher import rates may still win if it improves your export value (or if it pairs well with your SEG export tariff).
  5. Check eligibility and terms. Smart meter, half-hourly data consent, minimum term, exit fees, and whether the tariff requires additional products (e.g., EV, specific hardware or app control).

Battery size reality check: a 10kWh battery charged at 3.6kW needs roughly 3 hours of charging time (plus losses). If your off-peak window is 4 hours, that’s usually feasible. If your charge rate is 2.5kW, it may not fully charge in time.

Efficiency matters: many home batteries have round-trip efficiency around 85–95%. That means some energy is lost between charging and using it later—so the night rate needs to be low enough to still beat daytime prices.

Two realistic scenarios (with numbers)

Scenario A: Battery-only (no solar), good load shifting

Assumptions (illustrative): 10kWh battery, 90% round-trip efficiency, household uses 12kWh/day. You can charge 8kWh off-peak and use it during peak/daytime. Remaining 4kWh/day is bought at day rate.

Tariff 1 (single-rate example): 25p/kWh all day. Daily cost: 12kWh × 25p = £3.00/day (standing charge not included).

Tariff 2 (TOU example): 12p/kWh off-peak, 32p/kWh peak/day. Off-peak energy needed to deliver 8kWh usable = 8 ÷ 0.90 = 8.9kWh. Cost: 8.9kWh × 12p = £1.07 plus 4kWh × 32p = £1.28. Total ≈ £2.35/day (standing charge not included).

What this shows: when you can shift a meaningful chunk of usage to off-peak charging, a TOU tariff can reduce your import cost—even after efficiency losses. But you must also check standing charge and peak-rate exposure.

Scenario B: Solar + battery, export-aware comparison

Assumptions (illustrative): annual import 2,500kWh, annual export 1,200kWh (after self-consumption), standing charge differences ignored for simplicity. You’re comparing import + export value together.

Option 1: Import 24p/kWh, export 10p/kWh. Annual net cost ≈ (2,500 × £0.24) − (1,200 × £0.10) = £600 − £120 = £480.

Option 2: Import 26p/kWh, export 16p/kWh. Annual net cost ≈ (2,500 × £0.26) − (1,200 × £0.16) = £650 − £192 = £458.

What this shows: a tariff can look more expensive on import alone but still be better overall if export value improves—especially for solar households exporting regularly.

Standing charges and price caps: UK tariffs can be impacted by Ofgem’s price cap (for standard variable tariffs). Fixed and TOU tariffs are priced by suppliers and may move differently. Always compare the full projected annual cost including standing charge.

Battery tariff types: quick comparison

Use this table to narrow down the tariff type that’s most likely to be cheapest for your battery setup. Exact rates and windows vary by supplier and region.

Tariff type Why it can be cheapest Watch-outs Usually needs
Time-of-use (off-peak window) Very low night/unit rate for charging; battery covers expensive hours. High peak rate; you must avoid buying at peak. Some tariffs have changing rates. Smart meter, half-hourly readings.
Flat / single-rate fixed Predictable pricing; can beat TOU if you can’t shift much. Less opportunity to “arbitrage” with a battery; may have exit fees. Any meter type (varies).
Tracker-style import Can be cheap when wholesale prices are low; battery can help avoid spikes. Prices can change frequently; risk of high-cost days. Smart meter and comfort with variability.
Import + export bundle (solar-friendly) Better export value can reduce net annual cost for solar households. May have conditions; export rate may vary; check metering and scheme rules. Export-capable meter; SEG eligibility.

Decision checklist: who it suits (and who it doesn’t)

A TOU battery tariff is likely to suit you if:

  • You have (or can get) a smart meter with half-hourly readings
  • Your battery can charge mostly in the off-peak window
  • You can avoid running heavy loads in peak hours
  • You’re comfortable with higher daytime unit rates
  • You will actively schedule charge/discharge (or have automation)

It may not suit you if:

  • You’re often using lots of electricity at peak times (cooking, electric heating) and can’t shift it
  • Your battery is small relative to your evening usage
  • Your battery/inverter can’t charge fast enough overnight
  • You’re on a legacy meter setup that can’t support TOU tariffs
  • You prefer predictable bills above all else

Tip: If you’re unsure, compare a strong single-rate tariff against a TOU tariff using your best estimate of how many kWh you can shift to off-peak charging. If the TOU option only wins when you shift an unrealistically high percentage, it’s probably not the cheapest in real life.

Costs, exclusions and common pitfalls (UK-specific)

Battery tariffs can be excellent value, but they’re also where small print matters most. Here are the issues we see most often when people try to find the “cheapest” option.

1) Standing charge can wipe out savings

If your household uses relatively little electricity overall, a higher standing charge can make a “cheap unit rate” tariff cost more across the year. Always compare annual cost, not just p/kWh.

2) Smart meter requirements

Most TOU and tracker-style tariffs require half-hourly readings. If you don’t have a smart meter, you may be limited to flat-rate tariffs or need installation before switching.

3) Peak rates and lifestyle mismatch

Some tariffs have very high peak prices. If you regularly cook, wash, and run appliances during peak hours (and your battery can’t cover it), your bill can rise.

4) Exit fees and fixed-term trade-offs

Fixes can include exit fees. If market prices fall or your circumstances change (moving home, battery settings, export changes), leaving early may cost you.

5) Export arrangements aren’t automatic

If you export solar/battery energy, you typically need a separate export agreement (often SEG). Export rates differ and may be with a different supplier than your import.

6) Battery settings can change outcomes

A tariff can be “cheap” only if your battery is configured correctly (charge window, reserve level, discharge schedule). Ask your installer or check your app settings.

Economy 7 / legacy multi-rate meters: Some homes still have legacy multi-rate setups. Modern TOU tariffs are different and typically rely on smart metering rather than a traditional Economy 7 meter. If you’re unsure what you have, we can help you identify it when comparing.

FAQs: cheapest electricity tariffs for home batteries (UK)

Do I need a smart meter to get the cheapest battery tariff?
Often, yes. Many of the cheapest battery-friendly tariffs are time-of-use and require half-hourly readings from a smart meter. Without one, you may be limited to single-rate tariffs (or older multi-rate arrangements), which can still be competitive depending on your usage.
Is an EV tariff the same as a battery tariff?
Not exactly, but many EV-style time-of-use tariffs can work well for home batteries because they offer cheap off-peak electricity. Eligibility rules differ by supplier (some are EV-only; others are open to any smart meter household).
What’s more important: off-peak unit rate or the peak unit rate?
Both. A very low off-peak rate is only helpful if you can avoid buying much electricity at peak rates. The cheapest tariff for your battery is typically the one with the best overall annual cost when you model how many kWh you’ll buy off-peak vs peak, including battery losses.
Can I keep my export tariff (SEG) if I switch my import tariff?
Sometimes. SEG export is a separate agreement and you can often have export with a different supplier than your import. However, some suppliers offer linked import/export deals or additional conditions. Always check the terms before switching.
Are battery tariffs available everywhere in the UK?
Availability can vary by region, meter capability and supplier. Your distribution network area and your smart meter’s configuration can affect which tariffs you can access. Comparing with your postcode is the quickest way to see what’s actually available.
Will switching tariff affect my battery warranty?
Usually not, but heavy cycling can affect battery degradation over time. Some warranties specify maximum cycles or throughput. If a tariff encourages more frequent charge/discharge, it’s worth checking your battery warranty terms and your installer’s guidance.
What if I’m on prepayment?
Prepayment customers can have fewer tariff options, and availability varies by supplier and meter type (including smart prepay). If you can move to Direct Debit, you may access more competitive deals—subject to eligibility and credit checks where applicable.
How long does it take to switch electricity tariffs in the UK?
Switching is often completed within around 5 working days under the faster switching process, but timelines can vary (meter issues, debt checks, or complex setups can slow things down). Your supply shouldn’t be interrupted during a normal switch.

Trust, methodology and sources

Page details

How we assess “cheapest” for a home battery

We don’t label a single tariff as the cheapest for everyone. Instead, we help you compare tariffs using the factors that most affect battery households.

  • Total estimated annual cost: unit rates by time band + standing charges (where data is available).
  • Battery suitability: off-peak window length, peak price exposure, and whether a smart meter/half-hourly readings are required.
  • Export awareness: where relevant, we encourage comparing export value alongside import costs (SEG or supplier export plans).
  • Eligibility filters: region (postcode), payment method (e.g., Direct Debit vs prepay), and meter type.

Limitations: Worked examples on this page are illustrative and use rounded assumptions (usage split, efficiency). Real bills depend on your half-hourly consumption, battery settings, network region, and supplier terms. Always confirm current rates and fees before switching.

UK consumer guidance & official sources

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We’ll never guarantee savings. Your cheapest option depends on your meter, region, payment type and how you charge/discharge your battery.

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Updated on 19 May 2026