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Why are renewables moving so slowly? Of course the output of renewable energy is growing in absolute terms and in terms of market share in most countries in the world. But the growth starts from a very low base. On the International Energy Agency’s latest numbers, renewables provide just 13 per cent of total global energy needs at the moment, and will provide only 18 per cent by 2035. If traditional biomass is excluded the figures are 7 per cent and 14 per cent.

The problem is cost. Electricity produced from offshore wind and solar costs somewhere between 50 and 100 per cent more per MW/hr than power from natural gas and, with some variations, will continue to do so for the next decade unless one makes the assumption that gas prices are going to increase. Onshore wind is cheaper and in the US in particular is the closest of all the renewables to being competitive without subsidies. Read more