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A comment on Solar is dirt-cheap and about to get even more powerful. Parent comment

Re:Solar is dirt-cheap and about to get even more powerful by jeffbee on Sunday July 11, 2021 @12:18AM (#27798439)
Modern panels lose less than ½% per year. If you bought 20-year-old panels today you should expect to get 90% of their nameplate capacity still.

https://www.nrel.gov/docs/fy12osti/51664.pdf

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