With the UK government ending subsidies for onshore wind and the Trump administration pushing for a return to coal, you might think the wind power revolution had run out of puff. Far from it. The cost of energy from offshore wind in Britain has fallen by a third since 2012, and wind accounts for over 40% of new capacity in the US, representing an annual investment of $13bn. Now next-generation wind technologies promise to make wind energy safer and more affordable – if they can make the difficult jump from research prototypes to commercial products