Premium means premium, not standard grade. Premium anthracite is a low ash (8-9%), high carbon (84-87%), long burning coal. Anthracite is not to be confused with bituminous coal (soft coal), a much less efficient coal burned by power plants. Anthracite contains the most BTUs than any other comparable fuel source, such as wood pellets or firewood. Mined in the famous anthracite belt of Eastern Pennsylvania, our anthracite contains 13,700 BTUs per pound daily. 7-8% ash, 87-89% carbon, and is monitored daily.