Home battery storage
Last reviewed: 20 July 2026
A home battery typically costs around £5,000. It stores electricity, from your solar panels or from a cheap overnight tariff, for use when you need it. The Warm Homes Loan can fund a battery up to £15,000, with or without solar.
What a battery does for you
With solar, a battery lifts how much of your own generation you actually use, from around 35% to about 70%. That means buying less from the grid and exporting less at the lower Smart Export Guarantee rate. On its own, a battery can still save money by charging on a cheap overnight tariff and discharging at peak times.
It depends on your usage pattern and tariff. The solar and battery calculator lets you switch a battery on and off to see the difference for your home.
Test a battery in the calculator
Sources
- 2026 market install guides
- DESNZ Warm Homes Loan Scheme Scheme Rules, June 2026
Last reviewed: 20 July 2026
Know the day the loans go live
The Warm Homes Loan Scheme is expected to open to the public in September 2026. Join the list and we will email you when lenders open, with occasional funding updates in between.