re: Does the left really believe we can power the entire country on solar and wind?

Current mono cells last longer than 25 years. That’s been verified by numerous independent tests by DNV and other IE firms. Even older poly lasts but degrade more. If your opinion is that they completely fail, then the manufafruers have put their money where they mouth is because all the bankable manufactures have 25 year warranties with degradation maximums of .2% to .7% depending on the technology.