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How long from "design concept" till enough are tested, certified and built to help combat climate change? We have about 20 years left to transform our energy sector if you're optimistic. Building one with the old proven design takes about 15 years.
But there are solutions that simply require building more small units of something that's been built in large numbers for the past decade.
I'm talking about solar panels and wind turbines.
Source? I'd say the median is closer to 8, 15 years is more like the worst 5-15% percentile.