eli5: Why do we not run heavily on solar energy as a society or at least in sunny places?
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In large scale, solar energy, at least photovoltaic systems, can only work as complement to other sources. You would need huge batteries to store all the energy from the day to use in the night. There are systems that use mirror to reflect the sun into a tower, that way you could store the energy in heat form, but I don’t know how efficient those systems are.
Besides that, photovoltaic were not very efficient untill recently
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