The Smart Export Guarantee pays pennies, but time-of-use tariffs turn a UK battery into a daily arbitrage machine.
The market
The UK’s home storage market is shifting from feed-in-tariff legacy to time-of-use optimization. Octopus Agile and Intelligent Octopus Flux turn batteries into daily arbitrage machines, and heat-pump uptake under BUS grants is boosting storage demand for load-shifting.
Market Watch — August 2026
- Electricity price: 36.33 c€/kWh all-in (London) — Household Energy Price Index (HEPI), 2026-07-30 · source
- VAT on batteries: 0% VAT on batteries installed with solar, through 31 March 2027 — HMRC · source
- Home Energy Scotland: up to £7,500 grant for storage in rural areas — Energy Saving Trust (reviewed 2026-08-24)
Last updated: 2026-08-24
Rules & incentives
- 0% VAT on batteries installed with solar, through March 2027. — HMRC
- Home Energy Scotland grant: up to £7,500 for storage in rural areas. — Energy Saving Trust
- BUS (Boiler Upgrade Scheme) funds heat pumps at £7,500 but not storage directly. — Ofgem
Last reviewed: 2026-08-14
Guides for United Kingdom
UK guides: choosing between SEG and time-of-use export tariffs, MCS compliance for SEG eligibility, and the 0% VAT window on batteries (with solar) through March 2027.
Buyer’s checklist
- MCS certification is mandatory for SEG eligibility.
- Compare standard SEG rates vs time-of-use export tariffs — the difference can be 5x.
- The 0% VAT on batteries (with solar) applies through March 2027.
- Home Energy Scotland offers up to £7,500 for storage in rural areas.
