Interesting letter - Solar is still mighty expensive. Makes some good points about how long it takes to payoff even with the subsidy (23 years) and how the warranty is not that long. Another hopeful article (sounds like a press release) Start-up: Affordable solar power possible in a year. The key is concentrating the solar energy using mirrors/reflectors.
My opinion is solar will come down through a combination of simple improvements which individually don't decrease the cost that much, but when taken together will.
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