Kilowatt Club
Britain’s home battery fleet.
The problem
The UK can’t reach 100% renewables. Yet.
Sometimes the sun doesn’t shine and the wind doesn’t blow. Renewables now supply over half of Britain’s electricity — but on a still, dark evening, output collapses. So we keep gas power stations running to bridge the gap. Every calm evening, fossil fuels fill the void.
…unless we store the surplus.
Britain doesn’t have a generation problem.
It has a storage problem.
The solution
A fleet of home batteries. Coordinated.
Kilowatt Club members install a battery at home — owned by them, not us. When renewables produce more than the country needs, the fleet soaks up the cheap surplus. When the wind drops, thousands of batteries quietly power homes and the grid. Dispersed. Self-owned. Software-coordinated. No mega-projects, no new pylons, no waiting for the grid connection queue — every home already has a connection.
The prize
Ten million garages. The largest power station in Britain.
Around 10 million UK homes have a garage. Fit each one with a standard Kilowatt Club battery and together they form the largest power station in Britain — built with zero new land, zero new pylons, and zero grid connection queue. Every garage already has a connection.
0 GW
Dispatchable power. More than Britain’s winter peak demand.
0×
Dinorwig. Twenty times the power of Britain’s famous ‘Electric Mountain’ pumped-hydro plant.
0 GWh
Storage. Enough to carry the whole country through the evening peak, every single day.
0 TWh/yr
Cycled daily, the fleet shifts ~15% of Britain’s annual electricity from surplus hours into scarce ones.
The economics
It pays for itself. Then it pays you.
Overnight, when demand is low and wind is high, electricity on smart tariffs like Octopus Agile can cost a few pence per unit. At the evening peak it can cost five times more. Your battery buys low and sells high — automatically, every single day.
~£500–600/yr
Typical earnings, one home battery on today’s spreads
~£5,500
Typical installed kit cost
~10 yrs
Battery pays for itself — and the battery lasts longer
Projected figures based on real member data and current tariff spreads. Earnings vary with tariffs and usage. Projections, not guarantees.
The kit
Standardised. Certified. Yours.
The Battery
~10–14kWh certified LFP. Safe chemistry, 6,000+ cycles, outlives its own payback.
The Inverter
UK grid-certified hybrid with built-in export limiting. Speaks fluent National Grid.
The Brain
A Raspberry Pi running Kilowatt Club software. Reads tomorrow’s prices, plans every half-hour, keeps your battery safe.
You buy the kit in your own name at trade-curated prices. A qualified electrician installs it. We handle the paperwork guidance and configuration.
Software & pricing
The software is the club.
Our optimiser plans your battery’s day against half-hourly prices, executes it safely, and shows you exactly what it earned — every cycle reconciled to the penny. As the fleet grows, members’ batteries coordinate: soaking surplus together, never stampeding the same cheap half-hour.
£5 / month
Optimisation, monitoring, and your earnings ledger. Cancel anytime. The battery is yours forever.
Founding members
Join the Kilowatt Club.
We’re onboarding our founding members now. Tell us about your home and we’ll tell you what it could earn.
A few things to check first: you’ll need to own your home, have a garage or shed with an electrical supply — that’s where the battery lives — and be on (or ready to switch to) Octopus Energy, whose smart tariffs make the economics work.
Apply today