Cheaper, Cleaner Energy for Flats
Plug in the Windfall Battery, lower your bills.
The Windfall Battery is the only home battery designed for flats and renters.
Save hundreds of pounds a year. It’s the easiest way to reduce your bills and use more renewable energy at the same time.
Own a piece of energy history. Secure one of the first 100 units with pre-orders opening soon.
Save money on your bills
The battery monitors your electricity tariff and knows the best times every day to fill up with cheap off-peak energy, then gives it back during peak hours.
Cleaner energy - halve your CO₂
As well as saving money on your bills, the Windfall Battery powers your home with cleaner energy by tapping into the grid when renewables are at their peak.
Simple delivery & installation
Other home batteries need complicated and expensive installation and setup. The Windfall Battery is delivered to your doorstep and can be up and running in minutes.
Emergency power backup
If there’s ever a power cut, the Windfall Battery will ensure that your phone, internet and other key devices can be kept going.
A home battery that looks great in any home
How it Works
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Unpack the battery and plug it into a standard mains socket in your home.
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Connect the battery to the internet and tell it what energy tariff you have.
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The battery automatically optimises to save you money from day one.
The battery knows your energy tariff and constantly monitors the price of your energy and how green the grid is.
Then at off-peak times it will charge up with the cheapest electricity, which in the UK is nearly always the greenest too.
And in the peak times when you need energy for cooking and watching telly, that cheap energy is put back into your home.
“You just plug it in, there’s no crazy setup that you have to go through and you’re helping the planet so it’s win-win.”
“I’m renting in a flat and there’s nothing for me. It seems a bit crazy, it’s just plugged into the wall. The size is good because you can sit under your desk somewhere.”
“This sounds like a fantastic fit for my small flat. The size of battery is brilliant.”
FAQs
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This depends on your exact usage in your home, but we estimate you’ll save around £250 a year using the battery if you’re an average consumer in a flat or small home.
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For this pre-order crowdfunding campaign you’ll get the chance to secure one of the first 100 units of the Windfall Battery. We’ll let you know when the battery is ready ship and then you’ll need to pay the rest of the cost of the battery and provide shipping information.
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Installation is kind of like setting up a home printer. You’ll need to plug the battery in and then download an app which will guide you through the setup, which includes connecting the battery to your home WiFi.
If you’re struggling to set it up or have any technical issues we’ll be on hand to help. (And we’re actual humans.)
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These first batteries will ship in autumn 2026. Between now and then we’ll be sharing regular updates with you and let you know as soon as we have a firmer date.
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No problem. You can cancel your pre-order any time and get a full refund.
We’ll let you know when the battery is ready to ship and only then will you need to make the remainder of the payment.
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For this first batch we’ll only be shipping to customers in the UK.
If you’re not in the UK and would like to hear more about future availability in your country, please feel free to get in touch.
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To get the money-saving benefits you’ll need a time-of-use electricity tariff. That’s a tariff that has different prices for electricity at different times of the day. We can help you find the best one in your area.
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You can put the battery almost anywhere in your home. You’ll just need access to a spare mains socket and to be in range of your WiFi.
You don’t need to have your battery near to things you want to power from it. The battery puts power back into the main supply in your home so any appliance or device can take energy from it.
There are some additional guidelines about not installing batteries in bedrooms or where they would block a fire escape, and we can provide further guidance on this when your battery is ready to ship.
If you have any other questions about the battery, or about Windfall Energy, please feel free to get in touch.