Read this: Hot Tub Technology

Hot Tub Technology

This is a gem of an innovation story. Dr Mark Barrett's idea is simple, elegant, understandable and very, very doable. It's based on a novel view of existing infrastructure, there's a clear business case and, cannily, Dr Barrett has left ample room for other people to refine the implementation plan, thereby building an active constituency for the scheme's promotion.

What is it? Well, Dr Barrett wants to switch your immersion heater on when there's excess capacity in the electricity grid. The UK's preinstalled network of 19 million heaters can then act as storage devices for power generated by "bursty" renewables such as wind and wave. And with plans to roll out smart meters across the UK gathering momentum, now's the time to make this innovation.

Read David Strahan's excellent article for the facts and figures.