I worked for 2 electric/gas/fuel cell utilities for 3 decades. 30 years ago, we had a subsidiary that was working on natural gas fuel cells. The engineer showed me a fuel cell that was the size of a shoe box that would power a house. Their plan was to convert their natural gas customers with fuel cells at the street and use the existing electric line going to the house.
The by product of the fuel cell was water. Not sure what happened since I left that company 25 years ago. I know they are pursuing hydrogen fuel cells but that fuel isn’t readily available at the home
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