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A comment on Solar is dirt-cheap and about to get even more powerful. Parent comment
15kW will produce ~450MWh in 20 years (1500 hours of sun per year, varies between countries).
20k$/450MWh is 4cts/kWh which is pretty good IMHO
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15kW will produce ~450MWh in 20 years (1500 hours of sun per year, varies between countries).
20k$/450MWh is 4cts/kWh which is pretty good IMHO