Cheapest energy tariff for a home battery in the UK (what to look for)

The “cheapest” tariff for a home battery depends on how you charge it (overnight, solar surplus, or both) and what you export. Use this guide to compare tariffs sensibly and get a whole-of-market quote.

  • Understand which tariff features cut battery running costs (not just the headline unit rate)
  • See two realistic UK examples with estimated numbers and clear assumptions
  • Compare off-peak import vs export rates, standing charges, and eligibility (smart meter, region, payment method)
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Estimates only. Tariff availability, prices and eligibility vary by supplier, region, meter type and payment method. Always check the supplier’s tariff information label (TIL) before switching.

Fast answer: what’s usually “cheapest” for a home battery?

For most UK homes with a battery, the cheapest tariff is typically a smart tariff with a low off‑peak import window (so you can charge cheaply) plus export terms that match your setup (especially if you also have solar). But the best option differs by:

  • How you charge (grid overnight vs solar surplus vs mixed)
  • When you use electricity (evenings, daytime home-working, EV charging)
  • Your meter (smart meter often required for time-of-use tariffs and half‑hourly billing)
  • Export eligibility (MCS certification, export meter readings, supplier requirements)

If you mainly charge from the grid

Prioritise off‑peak unit rate and off‑peak window length. A very cheap window can be outweighed by a high peak rate if your battery can’t cover the peak hours.

If you have solar + battery

Compare export rate, any export caps, and whether export is fixed or variable. Your best value may come from export income as much as cheap charging.

If you also have an EV

Look at total off‑peak kWh you can shift (battery + EV). Some tariffs suit EV charging but can be less compelling for home battery export (and vice versa).

Important: We can’t name a single universally “cheapest” UK tariff on this page because prices change frequently and availability depends on your postcode, meter type and supplier rules. Instead, we show you exactly how to identify the cheapest tariff for your battery setup and how to compare like‑for‑like.

Compare battery-friendly tariffs (whole of market)

Tell us your details and we’ll match you to tariffs that fit battery use. We’ll highlight key terms like off‑peak windows, standing charges and exit fees where available.

What you’ll need: your postcode and a contact method. If you have a smart meter, battery and/or solar, mention it when we follow up so we can narrow to the best-fit tariffs.

Quick decision guide (before you compare)

Your battery is mainly grid-charged
Focus on off‑peak import rate, off‑peak hours, and the peak rate (because anything not covered by the battery will be billed at peak).
You have solar + battery (export matters)
Compare export rate and rules: fixed vs variable export, any caps, metering requirements, and whether you can export battery-stored energy.
You’re on prepayment or no smart meter
Some time‑of‑use tariffs may not be available. You may need a smart meter installation first, and prepayment options can be more limited.

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We use this to check regional pricing and tariff availability.

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How we assess “cheapest”

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What “cheapest” means for a battery (in plain English)

For battery owners, the cheapest tariff is usually the one that minimises your effective cost per usable kWh across the day. That depends on:

  • Off‑peak rate (what you pay to charge)
  • Peak rate (what you pay when the battery is empty or you’re using lots of power)
  • Standing charge (paid regardless of use)
  • Battery losses (round‑trip efficiency means you don’t get every kWh back)
  • Export rate (if you export solar or stored energy)

Comparison: tariff types that can work well with a home battery

Suppliers brand these differently, but most battery-friendly options fall into the categories below. Use the table to shortlist, then verify each tariff’s tariff information label and export terms.

Tariff type Best for What to check Common drawback
Time‑of‑use (TOU) import
Cheap off‑peak window		 Grid-charging a battery overnight to cover evening peak Off‑peak hours, off‑peak rate, peak rate, standing charge, smart meter requirement High peak rate can wipe out gains if you still import a lot at peak
TOU import + export bundle
Import & export together		 Solar + battery households optimising both charge and export Export rate type (fixed/variable), export eligibility, whether battery export is allowed, any caps May require specific metering/half-hourly reads; terms can be complex
Fixed tariff (single-rate)
Same rate all day		 People who don’t want TOU complexity, or can’t get TOU Unit rate vs standing charge trade-off, exit fees, fixed term length You may not fully benefit from battery load shifting
EV-focused TOU
Very cheap off‑peak		 EV + battery homes shifting lots of kWh into off-peak Peak pricing, eligibility rules (EV required?), charging schedule constraints Can be poor value if your non-shiftable usage is high

Battery tariff checklist (use this when comparing)

  • Off‑peak window: how many hours, and when?
  • Off‑peak rate: is it truly low enough after losses?
  • Peak rate: what happens if your battery empties early?
  • Standing charge: could it outweigh unit savings?
  • Exit fees: if you need to switch again soon
  • Metering: smart meter/half‑hourly required?
  • Export: rate, caps, and battery export rules (if relevant)

Who it suits / who it doesn’t

Likely to suit

  • Smart meter homes that can shift usage overnight
  • Battery large enough to cover evening peak most days
  • Solar + battery owners who can export surplus

May not suit

  • Homes with high daytime demand that can’t be shifted
  • Battery too small to meaningfully reduce peak imports
  • Anyone who can’t access TOU/export tariffs due to meter or supplier rules

Costs, exclusions and common pitfalls (battery tariffs)

Battery tariffs can look brilliant on the headline off‑peak rate, but real-world cost depends on what you import at peak and the terms you actually qualify for.

1) Battery efficiency losses

If your battery is ~90% efficient, charging 10 kWh may return about 9 kWh usable. When comparing tariffs, mentally add ~10% to the off‑peak cost (your actual efficiency varies by model, temperature and charge rate).

2) Standing charge trade-off

A higher standing charge can outweigh a slightly cheaper unit rate—especially for low-use households or homes that self-consume lots of solar.

3) Smart meter / half-hourly billing requirements

Many TOU tariffs require a working smart meter and may bill using half-hourly readings. If your meter isn’t communicating, you might not be able to join or stay on the tariff until it’s resolved.

4) Export rules are not universal

Export tariffs often have eligibility rules (for example, proof of installation standards, export meter readings, or supplier-specific requirements). Some export arrangements treat solar export differently from battery export—always read the terms.

Two realistic scenarios (estimated numbers, UK context)

Scenario A: Battery-only, grid charging overnight

  • Home: 2–3 bed, no solar, smart meter
  • Battery: 10 kWh usable, ~90% round-trip efficiency
  • Usage: 3,500 kWh/year (~9.6 kWh/day)
  • Shiftable via battery: 6 kWh/day moved from peak to off‑peak
  • Illustrative tariff rates: off‑peak 12p/kWh (4h window), peak 28p/kWh

Estimated daily saving from shifting 6 kWh: peak cost avoided (6 × 28p = £1.68) minus off‑peak charge cost adjusted for losses (6/0.9 × 12p ≈ £0.80) = ~£0.88/day (about ~£321/year), before standing charge differences.

Note: if your battery can’t cover the evening every day, or if peak/off‑peak prices differ, the result changes.

Scenario B: Solar + battery, exporting surplus

  • Home: 3–4 bed, solar + battery, smart meter
  • Solar generation: 3,200 kWh/year (varies heavily by system and shading)
  • Exported: 1,200 kWh/year after self-consumption and battery charging
  • Illustrative export rate: 15p/kWh
  • Illustrative import: 2,800 kWh/year, with 1,200 kWh shifted to off‑peak at 12p instead of 28p

Estimated export credit: 1,200 × 15p = £180/year. Estimated import saving from shifting 1,200 kWh: (1,200 × 28p) − (1,200/0.9 × 12p) ≈ £336 − £160 = ~£176/year, before standing charge and export rules.

Note: export payments and eligibility vary. Some homes export far less (or more) depending on occupancy patterns and battery size.

What to double-check before you switch

  • Payment method: prices can differ for Direct Debit vs other methods; prepayment options can be limited.
  • Region: electricity and gas standing charges and unit rates vary across Great Britain by region.
  • Fuel type: dual fuel bundles may price electricity differently than electricity-only.
  • Exit fees and term: fixed tariffs may charge to leave early.
  • Battery controls: ensure your inverter/app can schedule charging in the off‑peak window.

FAQs: cheapest home battery tariffs in the UK

Do I need a smart meter for a battery tariff?

Often, yes—especially for time‑of‑use tariffs that price electricity by time of day. Some suppliers also require half‑hourly readings. If you don’t have a smart meter, you may be limited to single-rate tariffs until one is installed and communicating.

Is the cheapest tariff always the one with the lowest off-peak rate?

Not always. If the peak rate or standing charge is high, your overall bill can be higher than on a tariff with a slightly higher off‑peak rate. The cheapest option depends on how much energy you can reliably shift into off‑peak.

Can I export electricity from my battery in the UK?

It depends on the supplier and the export tariff terms. Some allow export from stored energy; others focus on renewable generation export. You’ll also need appropriate metering and an export agreement. Always check eligibility and definitions in the export terms.

Do I have to be on the same supplier for import and export?

Not necessarily. Some export tariffs can be taken separately, but many suppliers prefer (or require) that you also import from them. Splitting import and export can add complexity—make sure you understand meter reads, payments and any restrictions.

Will a battery tariff work if I’m on prepayment?

Options can be more limited on prepayment, and some time‑of‑use tariffs may not be available. If you’re considering changing payment method, check how it affects tariff availability and pricing. If you’re struggling to pay, free independent support is available via Citizens Advice.

What about Economy 7 or multi-rate meters?

Economy 7 can work with battery charging if the off‑peak window matches your needs, but modern smart TOU tariffs can be more flexible. If you have an existing multi-rate setup, compare it carefully to TOU options and check whether switching requires any metering changes.

Are there exit fees on battery-friendly tariffs?

Some fixed tariffs have exit fees; variable tariffs usually don’t, but terms vary. Check your current tariff and any new tariff’s key information, especially if you expect to switch again within the next 12 months.

How do I know if my battery is big enough for a TOU tariff?

A simple check: look at your typical evening usage (e.g. 4pm–10pm) and compare it with your battery’s usable capacity. If you routinely import at peak because the battery empties early, a high peak-rate tariff may not be “cheapest” for you.

How we assess the “cheapest” tariff for a home battery

We treat “cheapest” as the tariff that is likely to deliver the lowest annual bill (or net bill after export) for a specific household pattern, not the lowest single unit rate.

Our comparison factors

  • Import pricing: peak and off‑peak unit rates, number of rate periods, and timing
  • Standing charges: electricity (and gas, if dual fuel)
  • Export pricing: rate type, eligibility requirements, and any restrictions we can verify
  • Practical fit: smart meter requirements, payment method restrictions, and whether the household can realistically shift kWh
  • Consumer impact: exit fees, contract length, and complexity (risk of paying peak unexpectedly)

Assumptions used in the scenarios on this page

  • Battery round-trip efficiency assumed ~90% (varies by system).
  • Illustrative peak/off‑peak rates are examples for explanation only and are not quotes.
  • We exclude changes to standing charges between tariffs in the scenario maths (you must include these in a real comparison).
  • Export volumes are highly seasonal; examples are annualised estimates.

Limitations: Tariffs change frequently and can be restricted by region (distribution area), meter type, and supplier policy. Always confirm the latest tariff rates and conditions directly from the supplier before switching.

Trust & editorial details

Reviewed by
Energy Specialist
Last updated
May 2026

UK sources (reputable guidance)

Need help with a bill or supply issue? Citizens Advice provides free, independent support, including for prepayment and vulnerability considerations.

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Updated on 26 May 2026