Ok, I've updated the spreadsheet to properly account for discounted energy (discount rate: 4%) and degradation (at the rated 92%/25yr). It comes out to 6c/kWh,

Ok, I've updated the spreadsheet to properly account for discounted energy (discount rate: 4%) and degradation (at the rated 92%/25yr). It comes out to 6c/kWh, which is about 20% larger than my first number. Half of that increase was due to the degradation, the other half from the limited time horizon - and assuming the system will be worthless after 25yr (!!). http://databin.pudo.org/t/4cb861 http://databin.pudo.org/t/4cb861 This is all just a thought experiment for me, because my electricity costs 22c/kWh :)