UK Battery Storage Tariff Comparison 2026
Which UK time-of-use tariff earns most on a home or commercial battery in 2026? Octopus Flux, Cosy Octopus, Intelligent Octopus, Tesla Energy Plan, Ovo Charge Anytime, British Gas EV Tariff — compared on real customer data, not marketing.
The 6 tariffs that actually work with a battery
VPP (Virtual Power Plant) earnings on top
Most modern batteries (Sigenergy SigenStor, Tesla Powerwall 3, Aelio, Solax T-Bat) qualify for Virtual Power Plant programmes that pay you for grid-balancing services. Real 2026 ranges from KMM customers:
- Octopus VPP (via Power Pack): £60-£140/yr on a 10 kWh battery
- Tesla VPP (Energy Plan customers): £80-£180/yr on a Powerwall 2/3
- Ovo VPP (CrowdFlex): £40-£90/yr
- Sigenergy VPP (via Octopus or Centrica): £150-£280/yr — higher because of multi-stack capacity
How to choose your battery tariff
Step 1 — Audit your consumption. Pull 12 months of HH data. Identify your peak-time consumption (16:00-19:00 typically) — that is what battery arbitrage protects against.
Step 2 — Match the cheap window. If you have a heat pump, Cosy gives you 3 cheap windows daily. If you have an EV but no heat pump, Intelligent Octopus or Ovo Charge Anytime is cheaper still. If you have neither, Flux is the highest-earning.
Step 3 — Check export rate. If you have solar above 4 kWp, the export rate matters more than the import rate. Flux's variable export rate (13-26p depending on time) beats most fixed-export tariffs over a year.
Step 4 — Check exit fees. Many fixed tariffs charge £75-£150 per fuel to leave early. Worth it if savings justify, but check first.
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Get a battery tariff recommendation with your KMM install
Every battery install comes with a 12-month HH data audit and tariff recommendation — bound into your quote, not bolted on as an upsell.
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