Since the turn of the century, the expansion of solar power has surpassed expectations, more than any other energy source.  Once extremely expensive and only used in remote regions, space travel or pocket calculators, today's solar modules — easy to set up and operate — generate cheap electricity all over the world. Global solar energy capacity has skyrocketed over the last decade: - 228 gigawatts in 2015, providing 1% of the world's electricity - 759 GW in 2020, or roughly 3% of global energy