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So at the end of the day what matters are objective comparisons of *lifecycle* usage of non-renewable resources. In case of energy sector I consider these as first priority:
* surface power density (how much land surface per unit of energy)
* greenhouse gas emissions (how much CO2)
* capacity factor (which makes any 1000 kWh of PV only 150 Wh in UK reality)
And then secondary metric:
* levelized cost of energy (LCOE, how much $$$ per unit of energy)
