There are various studies on the topic. For Germany, the figures that stuck in my brain were these: We can go 60% renewable without much of a problem, 80% with

There are various studies on the topic. For Germany, the figures that stuck in my brain were these: We can go 60% renewable without much of a problem, 80% with strategic storage and significant grid improvements, 100% via off-shore windparks and power-to-gas (our natural gas infrastructure can store hundreds of TWh).