The idea started to take shape. Could they make a home into a power station? And not just their home, but perhaps their whole street by linking the houses together into a grid? Buying and installing a solar system for an average three-bedroom house costs around £10,000, they discovered. Linking them together would be hard – the technology is complex, especially in an urban area with lots of individual buildings. They did more research. And then they started talking to neighbours.
