Most home energy tech assumes people own their home. Windfall's compact, design-forward battery plugs into a standard socket and can save renters GBP 250 a year.
The clean energy transition hasn't done much for renters. Rooftop solar, wall-mounted batteries, smart home systems — most of it assumes people own their home, have space and plan to stay put. That leaves a large group behind. In London alone, more than a million people rent privately, and across the UK, about a third of households don't own their homes. For people living in apartments, tech-powered ways to cut energy bills (and emissions) are mostly out of reach.
UK startup Windfall Energy is trying to change that with a compact, 2.5 kWh home battery designed for renters and flat-dwellers. The Windfall Battery charges when electricity is cheapest and then uses that stored energy during peak times, when power costs more. Both storage and delivery are handled automatically based on a household's energy provider and their specific rates and peak times. Windfall estimates that an average flat or small home could save around GBP 250 a year.
The unit plugs into a standard socket and doesn't require installation. Take it out of the box, connect it to Wi-Fi, and it starts working. If people move, they can take it with them. The battery is designed to look more like a piece of furniture than a piece of tech, and also works as a backup during outages. The first 100 units are now available for pre-order for GBP 1,000.
TREND BITE
Windfall starts with savings, not sustainability. The product reduces energy bills first; lower emissions follow naturally. That approach sidesteps a familiar challenge: many people support the energy transition, but price still drives decisions at home.
When the cheaper option also happens to be greener, sustainability stops being a trade-off. It becomes the default. Products that quietly bake in savings don't rely on consumers to make values-based decisions. They just offer a better deal. For brands, that opens up a much larger market than eco-messaging alone.