They don't have to pay for fuel but they have to rely on fossil fuels when ever a cloud blocks the sun and when the sun goes away at the end of every day.
If you are worried so much about CO2 then the obvious answer is nuclear power since it can produce power 24 hours a day, rain or shine, 7 days a week for roughly 350 days a year, a feat that will always allude solar and wind power.
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