Cheapest energy tariff for a home battery in the UK
Find battery-friendly tariffs that can cut your charging costs overnight, and learn what “cheap” really means once export rates, fees and smart meter rules are included.
- See what to look for in an off‑peak or smart tariff (and the trade-offs).
- Compare the key tariff types for battery charging and solar export.
- Get a whole-of-market quote in minutes (no obligation).
Estimates only. Tariffs vary by region, meter type, payment method, credit checks and eligibility (including smart meter requirements). Always check unit rates, standing charge and exit fees before switching.
Fast answer: the “cheapest” battery tariff is usually an off‑peak or smart time‑of‑use deal
For most UK homes with a battery, the cheapest tariff for charging is typically a time‑of‑use tariff that offers a low overnight unit rate for a fixed window (often 4–7 hours). But the best overall deal depends on your full pattern of use: daytime unit rates, standing charge, export payments (if you have solar), and any supplier/installation eligibility rules.
If you charge overnight
Prioritise: cheapest off‑peak unit rate + long enough off‑peak window to fill your battery.
If you also export solar
Prioritise: strong export rate + fair import rates. “Cheap charging” can be offset by weak export payments.
If you’re home in the day
Check peak/day unit rates carefully. A low night rate isn’t helpful if much of your use happens at peak prices.
Quick caveat: There isn’t one permanent “cheapest UK battery tariff”. Prices vary by region (distribution area), payment method (Direct Debit vs prepayment), meter type (smart meter usually required), and eligibility (some tariffs are bundled with particular battery/EV products). Always compare on your actual usage, not headline rates.
Get a whole-of-market battery tariff comparison (and what we’ll ask you)
To find the cheapest tariff for your home battery, we compare estimated annual costs using your details (including whether you can shift charging into off‑peak hours). If you also have solar PV, we’ll factor in likely export payments where available.
Check these before you switch
- Smart meter requirement
- Most off‑peak/time‑of‑use tariffs require a working smart meter (often SMETS2).
- Off‑peak window
- Make sure the cheap hours match when your battery can charge, and check weekend/season rules.
- Import vs export
- If you export solar, compare export rates and any conditions (e.g., fixed vs variable, caps, or bundle requirements).
Battery settings that affect results
- Usable battery capacity (kWh) and max charge rate (kW).
- How much you typically charge from the grid vs solar.
- Whether you avoid charging during peak price windows.
- Round‑trip efficiency (a battery delivers less than it takes in).
Tip: If you’re not sure, use last year’s electricity usage from your bill or smart meter app. You can still compare—just treat results as estimates.
Two realistic examples (with numbers)
These are simplified illustrations to show why the “cheapest battery tariff” depends on your usage pattern. Rates are example rates only (not a promise), and exclude standing charges for clarity.
Scenario A: battery-only, shiftable home
Home: 3,600 kWh/year electricity use. Battery: 10 kWh usable, 90% round-trip efficiency. Behaviour: 60% of usage supplied from overnight charging.
Tariff 1 (Flat): 26p/kWh all day.
Tariff 2 (TOU): 10p/kWh off‑peak (6 hours), 30p/kWh peak/day.
Estimate: If 2,160 kWh/year comes from the battery, you’d need about 2,400 kWh/year of off‑peak charging (allowing for ~90% efficiency). Charging that at 10p instead of 26p is an estimated saving of ~£384/year on those kWh (2,400 × £0.16), but some remaining usage may be at 30p—so the net benefit depends on how much you still use in peak hours.
Scenario B: solar + battery, high export
Home: 3,200 kWh/year import. Solar: exports 1,200 kWh/year. Battery: charges partly from solar, partly off‑peak.
Tariff 1: Great off‑peak import, but low export (e.g., 10p night / 30p day; export 5p).
Tariff 2: Slightly higher off‑peak import, but strong export (e.g., 12p night / 28p day; export 15p).
Estimate: The 10p vs 12p difference on, say, 1,800 kWh/year of off‑peak charging is ~£36/year. But the 5p vs 15p export difference on 1,200 kWh/year is ~£120/year. In this simplified case, Tariff 2 could work out better overall even though it’s not the lowest night rate.
What these examples miss: standing charges, regional variations, price caps on SVT, fixed-term discounts, and eligibility rules. Use them as a decision guide—not a forecast.
Request your comparison
Share a few details and we’ll help you compare tariffs that suit battery charging and (if relevant) solar export. No scripts, no fuss.
Compare tariff types for home batteries (UK)
Instead of naming a single “cheapest tariff” (which can be misleading), this table shows the main tariff types and how they tend to work for battery owners. Always check the exact off‑peak times and rates for your region.
| Tariff type | Why it can be “cheapest” for batteries | Common catch | Best for |
|---|---|---|---|
| Time‑of‑use (fixed windows) | Low overnight unit rate lets you charge the battery cheaply and use it during the day. | Day/peak rate can be higher; savings depend on how much load you can shift. | Battery-only homes, or those with predictable charging routines. |
| Dynamic/half‑hourly pricing | Can be very cheap in some low-demand periods if you automate charging. | Price risk: rates can spike; requires close monitoring or automation and a smart meter. | Tech‑savvy users with battery automation and flexibility. |
| Flat-rate fixed tariff | Simple; no timing rules. Can still be competitive if your usage isn’t shiftable. | Usually not the cheapest way to charge a battery overnight versus TOU deals. | Homes that can’t reliably charge at night. |
| SVT (standard variable) | Flexibility; no exit fees typically. Protected by the Ofgem price cap (for default tariffs). | Often not optimised for batteries; you may pay more than necessary for night charging. | Short-term stopgap, or if you expect to move soon. |
| Import + export bundle (solar/battery focused) | Good export payments can materially improve overall cost if you export significant solar. | Eligibility rules may apply; export rates may vary; some require smart metering and specific setup. | Solar + battery homes with meaningful exports. |
Decision checklist: pick the right “cheap”
- Can you shift at least 30–50% of your import into off‑peak? If not, a flat tariff may be safer.
- Is your battery charge rate fast enough to fill during the off‑peak window?
- Do you have a smart meter (and does the supplier require one)?
- Do you export solar? Compare export rates and terms, not just import.
- Check standing charge—it can erase gains from a low unit rate.
- Check exit fees and contract length if you may move or expect better deals soon.
Who it suits / who it doesn’t
Suits: people who can automate overnight charging and use battery power during the day.
May not suit: households with high daytime import (home all day, electric cooking/heating) and limited ability to shift.
Suits: solar exporters who can benefit from a higher export payment structure.
May not suit: homes without a smart meter where the tariff requires half‑hourly settlement.
Costs, exclusions and common pitfalls (battery tariffs)
Battery tariffs can look amazing on a headline night rate, then disappoint once the full costs and rules are applied. These are the gotchas we see most often in the UK.
Standing charge dominates
If your usage is low (or you export most of your solar), a high standing charge can outweigh cheaper unit rates. Always compare total annual cost.
Off‑peak window too short
A 4‑hour cheap window may not fill a larger battery (or may require high charge power). Check your battery’s max charge rate (kW).
Peak/day price is steep
If you still import lots during the day, a high peak rate can wipe out gains. This matters if you work from home, have electric cooking, or run heat pumps.
Eligibility rules
Some tariffs are limited by meter type, payment method, or require certain hardware/app control. Read the tariff T&Cs before you commit.
Export assumptions
If you have solar PV, don’t assume export payments are the same across suppliers. Your “cheapest” outcome might be the best import+export combination.
Exit fees & moving home
Fixed tariffs may include exit fees. If you’re renting or expect to move, factor flexibility into your decision.
Important: prepayment meters and batteries
If you’re on a prepayment meter, tariff choice can be more limited and some smart/time‑of‑use options may not be available. If you’re struggling to pay for energy, see guidance from Citizens Advice energy support.
FAQs: cheapest home battery tariffs (UK)
Do I need a smart meter for a battery-friendly tariff?
Often, yes. Many UK time‑of‑use or half‑hourly tariffs require a working smart meter to bill different rates by time. If you don’t have one, you may be limited to standard single-rate tariffs or fewer options.
What matters more: the night rate or the standing charge?
Both. A very low night rate can be cancelled out by a high standing charge—especially for lower-usage homes. Compare estimated annual cost for your postcode and usage, not just the cheapest p/kWh figure.
Can I charge my battery cheaply without switching tariffs?
You can optimise by charging when your existing tariff is cheapest (if it’s time‑of‑use), or by reducing total import. But if you’re on a flat tariff, the unit rate is the same day and night—so switching is usually the main way to access cheaper overnight rates (eligibility allowing).
Are battery tariffs the same as EV tariffs?
They can overlap. Many EV-focused tariffs work well for home batteries because they provide a low overnight window. However, always check the daytime/peak rates and whether the tariff has any EV-specific conditions (terms vary by supplier).
If I have solar, should I prioritise export rates?
If you export a meaningful amount, export rates can make a big difference to your net cost. The best choice is often the best import + export combination, not necessarily the lowest import night rate.
Will switching affect my battery warranty or performance?
Switching supplier/tariff shouldn’t affect a battery warranty by itself, but how you operate the battery can. Check your installer guidance on charge/discharge cycles, maximum power, and temperature limits. If a tariff requires app-based control, confirm your battery is compatible.
What about Economy 7 or legacy multi-rate meters?
Economy 7 can work for battery charging if the night window is long enough, but rates and timings vary by region and meter setup. Some households choose to upgrade to a smart meter for broader time‑of‑use choices.
How quickly can I switch in the UK?
Switching times vary, but many switches complete in a few working days. Your supply doesn’t go off during a switch. For consumer rights and switching basics, see Ofgem consumer guidance and Citizens Advice on switching.
Trust, methodology and limitations
How we assess the “cheapest” home battery tariff
We prioritise what matters to battery households: total estimated annual cost, not just the lowest off‑peak unit rate. When comparing tariff options, we consider:
- Regional pricing (your postcode determines the distribution area and standing charge levels).
- Meter compatibility (smart meter requirements and whether half‑hourly data is needed).
- Time windows for off‑peak/peak rates and whether they are fixed or dynamic.
- Standing charge and any exit fees on fixed terms.
- Export tariff terms (if you have solar), where available, because export can change the net cost.
Limitations (important)
- Battery behaviour varies: charge/discharge settings, efficiency and household load shape can materially change outcomes.
- Tariffs change: suppliers can update prices and eligibility; always confirm details during application.
- Export is not guaranteed: export payments depend on eligibility, metering and scheme terms.
- We don’t assume perfect shifting: results are estimates and should be treated as guidance.
Sources (UK)
- Ofgem: information for energy consumers
- Ofgem: energy price cap
- Citizens Advice: energy (bills, meters, switching)
- GOV.UK: smart meters
If you’re comparing deals that rely on smart pricing, also check whether your smart meter is communicating reliably with your supplier—this can affect billing accuracy on time‑of‑use tariffs.
Ready to find the cheapest battery tariff for your home?
Compare battery-friendly tariffs by postcode, including time‑of‑use options where available. We’ll show key terms so you can decide with confidence.
Back to EV Charger