Coal is the most widely used fossil fuel for power generation.






Types of Coal:



Lignite--a widely available type of coal with moderate sulfur content and low energy value. Sometimes referred to as “brown” coal.


Subbituminous (western coal)--Generally low in sulfur content, high energy value.


Bituminous (eastern coal)--Generally high in sulfur content, high energy value.


Anthracite—highest carbon content found in the northeastern portion of the country and has high energy value.


  • Blend--combination of any type of coal and petroleum coke.


Note: The list above represents different ages (listed here from youngest (top) to oldest (bottom)) in terms of the origin of the plant material they derived from.




Fugitive emissions from coal handling.

  • Particulate matter (coal dust).

Trace metals 


  • Stormwater runoff from coal pile containing trace metals.
  • Wastewater used for dust suppression containing trace metals.


[Click here to view Coal’s Composition]





Natural gas is a clean fuel, widely available, but subject to market pressures.





Natural Gas
Gas Conditioning
  • Spent glycol from gas drying.
  • Distillate collected from low spots.


[Click here to view Gas’ Composition]





Most utilities burn either Number 6 bunker fuel or Number 2 diesel fuel.  Generally speaking concentrations of input materials are much lower in Number 2 diesel fuel.






(Number 6 bunker fuel or Number 2 diesel fuel)

  • Fugitive emissions from oil storage tanks and related piping.
  • Volatile Organic Compounds (VOCs)
  • Spills and Leaks from filling and transferring product.