> Also solar panel efficiency fades over time, you loose 50% of efficiency after a few decades. Perhaps it's more relevant that the solar panels that were inst

> Also solar panel efficiency fades over time, you loose 50% of efficiency after a few decades. Perhaps it's more relevant that the solar panels that were installed decades ago were 50% less efficient; that's technological progress. https://sites.lafayette.edu/egrs352-sp14-pv/technology/history-of-pv-technology/ https://sites.lafayette.edu/egrs352-sp14-pv/technology/histo... Progress that was enabled substantially by there being a market that would buy the early inefficient solar panels, providing capital for further research.