If anthracite has the highest coal rank, why isn't it being used more for electric generation purposes?

Question

It is said that anthracite produces the least sulfur that the 4 other types, making it the most environment-friendly. Thus, why isn't it a popular choice for power plants? Is it because of the price or for another reason?

Answer 1

Because it is 2x to 3x more expensive than Lignite or Bituminous coals

Answer 2

probably due to the amount of pollutants it releases.