Back in the day northern Minnesota had some wood fired grain dryers built by local Finns. They learned this in the old country. Worked OK for enough oats to feed the family cow and a team of horses. Have heard of some bigger ones using a wood fired hot water boiler but have not seen one in action.
Years like this require bean drying, and you have to go cooler and more humid to avoid lots of soybeans splitting. Need half or less of the drying rate used for corn. I was recently explaining to a NE Minnesota farmer how I was getting rich ;-) growing soybeans with high K cattle manure. He said yaaa, but we have no gas fired grain dryers in my area.
How many gas fired dryers are up on the Rainy? I hope your grain guys did not spend all their money on new combines?