Ash Quality


We offer a variety of fly and Kiln-Feed ash residues to our customers. As the ash produced at our four Generation Stations is distinct, we can provide tailored ash products for use in range of industries.

We offer a variety of fly and kiln-feed ash residues to our customers. As the ash produced at our four generation stations is distinct, we can provide tailored ash products for use in range of industries.

Though ash composition is variable and depends on plant operating conditions, fuel blend, and chemical treatment, commonalities exist for the ash produced across our Generation Stations. Our fly ash contains:

  • Silicon Dioxide (SiO2)
  • Calcium Oxide (CaO)
  • Iron (III) Oxide (FeO2)
  • Aluminum Oxide (Al2O3)

Dependent on the fuel blend used, our fly ash may also contain trace amounts of other materials.

As fuel blends and operating conditions have been carefully monitored for consistency over the operational life of each plant, the ash residue produced has also remained consistent in terms of composition. As a result, we have a large inventory of ash produced at each plant, which deviates very little with respect to chemistry and physical properties.

The following table compares ash residue compositions by generation station to the corresponding ASTM specifications for Class F, Class C, and Kiln-Feed Ash residues.