That's not what the article says.

Considering that the property has a well on-site, water is free, and as far as heat goes, well, one could either pay a little extra in electric for that — or they could have the Amish deliver their scrap wood from their sawmills to burn in a wood stove, very cheaply.

Maybe "a little bit of electricity" or "very cheap scrap wood" appear to be the vague plans for how to handle heat.