One of the principal architects of Germany’s push into renewable energy technologies, Hans-Josef Fell, believes that the country could achieve 100% renewables in its electricity sector by 2030 -- and may do it quicker. The rest of the world could follow soon after.

Fell, a Greens politician and architect of the the feed-in-tariffs that have helped the country already produce 20% of its energy from wind, solar, biomass and geothermal sources, and pushed it to the forefront of clean energy technologies, says the growth of renewables will continue at an exponential rate. This is partly because of the growing cost of conventional fossil fuels, and partly because of their inability (apart from gas) to balance the intermittent nature of renewable energy generation.