Lignite, also called brown coal, is a fossil fuel that have similar HHV with wood pellets.
There exists surface lignite mines in multiple states that is struggling because the nearby lignite power plant is closing.
Does it make money to make lignite pellets, just like wood pellets, for marketing to pellet stove users?
The pro is cost. Lignite sells for less than $10/ton at the mining site, and low density lignite saves the cost of shredding.
In my estimate, lignite pellets could sell for $30/ton from the mining site, saves lota money than $200/ton wood pellets.
The con is ash content. Lignite typically have 6-19% ash content, compared to 2% of wood pellets, so the users need to dump ash more often than wood pellets.