Sail... That isn't really the problem...
Electricity has been generated from fossil fuels since the beginning.
We move from one source to another based largely on cost.
Natural gas is cheaper than coal (pipelines are more efficient than trains proven by Rockefeller)... and NG has a better thermal signature.
The reason that we have moved from gasoline in small tools is due to the fact that the first battery tools were corded - there were no gasoline versions of them.
Once on a platform, it just makes since to use that platform more and more. Add to that the gasoline doesn't have the greatest shelf life with ethanol, and anything that sits for long periods becomes even more convenient to use the battery platform that you have already invested in.
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