Executive summary
Home batteries let households store cheap or self-generated electricity and use it when power is expensive. This report assesses whether that translates into a worthwhile financial return in 2026, for homes with and without solar panels.
We find batteries make the strongest case when paired with solar or a time-of-use tariff that offers cheap overnight rates — and a weaker case for homes on a flat tariff with no generation.
Key findings
- A battery on a cheap overnight tariff can arbitrage the day/night price gap even without solar.
- Paired with solar, batteries lift self-consumption of generated power substantially.
- Payback is highly sensitive to battery cost, cycle life and the tariff price spread.
- Oversizing a battery for a small home rarely pays — capacity should match usage.
How batteries save money
There are two savings routes: storing your own solar generation to use later, and charging from the grid when electricity is cheap to avoid buying at peak rates. The best returns often combine both.
The size of the day/night price spread on your tariff is the single biggest lever on grid-charging savings.
Methodology
- Savings are modelled from typical UK household load profiles, current tariff spreads and representative battery costs and cycle life.
- Solar pairing scenarios use typical UK generation figures by system size.
Sources & references
- Ofgem — Energy price cap — UK regulator's quarterly price cap announcements
- DESNZ — UK energy statistics — Department for Energy Security & Net Zero
- Ofgem — Typical Domestic Consumption Values — Standard usage assumptions for UK households
Figures are checked against primary sources before publication. See our methodology for details.
Editorial note
PowerGuardian publishes independent, UK-focused research, analysis and commentary on household energy costs. Confirmed data, our own estimates, forecasts and scenarios are labelled separately so you can see which is which.
This report is reviewed at each Ofgem price cap announcement and whenever a source dataset it relies on is revised. It was last reviewed on 11 July 2026.
We take no commission from energy suppliers for the rankings, scores or figures shown here.
Read our editorial policy and corrections policy.
