Batteries
Is a home battery worth it in the UK in 2026?
Batteries have become the default upsell on every solar quote. For some households they are the single best-value upgrade available; for others they are an expensive way to shift a small amount of cheap electricity. Here is how to tell which one you are.
Our verdict
A battery usually stacks up if you are on a time-of-use tariff with a cheap overnight rate and a household that consumes well above average. It rarely stacks up on a flat single-rate tariff with low evening usage.
Prototype figures — illustrative, not sourced
The costs, savings and paybacks below are placeholders written to demonstrate the format. They are not drawn from market data and have not been independently reviewed. Do not use them to make a purchasing decision.
Typical installed cost
£3,800–£7,500
Illustrative example only — invented placeholder, not sourced
Typical annual saving
£280–£620
Illustrative example only — invented placeholder, not sourced
Simple payback
8–14 years
Illustrative example only — invented placeholder, not sourced
What a battery actually earns you
A home battery does not generate energy. It moves energy in time. Every pound it saves comes from one of three places: charging cheaply overnight and discharging during expensive hours, storing solar you would otherwise export for a few pence, or occasionally exporting at a high rate.
That framing matters because it caps the upside. Your maximum possible saving is your annual consumption multiplied by the spread between your cheap and expensive rates — and no real installation captures all of it. Round-trip losses, inverter limits and the days you simply do not use a full cycle all take a share.
The households where it works
The strongest cases we see share the same characteristics. High consumption, a wide tariff spread, and a home that reliably uses the stored energy every evening.
- Annual electricity use well above the typical UK household
- A time-of-use tariff with a materially cheaper overnight rate
- An electric vehicle, a heat pump, or both, increasing total throughput
- Enough evening and peak-time load to empty the battery most days
The households where it does not
If you are on a flat rate tariff, a battery earns almost nothing without solar. If you consume little and are out all evening, a large battery will spend most of its life partially cycled — you have bought capacity you never use.
We would rather tell you to spend nothing than watch you finance a system that pays back after its warranty expires. If the numbers here do not work, moving tariff and adding a smart charger is usually the better first move.
What could change the answer
Battery economics are unusually sensitive to tariff design. A narrowing peak-to-off-peak spread reduces savings roughly proportionally. Equally, adding an EV or heat pump after installation can substantially improve a marginal case, because throughput rises without any extra hardware cost.
Common questions
Sources and evidence
- Status: Prototype content. No sourced dataset sits behind the figures on this page yet.
- Planned: installer quotations: Anonymised UK quotations, once a quotation dataset has been collected
- Planned: tariff rates: Published domestic time-of-use rates, with the date they were read
Read the full methodology for how these figures are produced and reviewed.