Dick and Dom's quest takes them into the frazzling, windy and fast-flowing world of renewable energy. Heading deep into the searing Nevada desert, the pair discover how the sun's energy could keep the world powered forever, at the iconic Hoover Dam, they uncover the genius behind how a vast lake can generate epic amounts of power, before they put all they've learnt to the test with their own suitably wacky take on a power station.