On a vast manmade lake on the outskirts of London, work is nearing completion on what will soon be Europe’s largest floating solar power farm – and will briefly be the world’s biggest.

But few are likely to see the 23,000 solar panels on the Queen Elizabeth II reservoir at Walton-on-Thames, which is invisible to all but Heathrow passengers and a few flats in neighbouring estates.

Five years in planning and due to be finished in early March, the £6m project will generate enough electricity to power the utility’s local water treatment plants for decades.

Read the story on The Guardian.