This article in Project Syndicate presents the numbers on renewable energy cost-effectiveness for the decade.

The costs of solar and wind power have fallen more than 80% and 70%, respectively, while lithium-ion battery costs are down from $1,000 per kilowatt-hour in 2010 to $160 per kWh today. These and other breakthroughs guarantee that energy systems which are as much as 85% dependent on variable renewables could produce zero-carbon electricity at costs that are fully competitive with those of fossil-fuel-based systems.

Project Syndicate