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Therm Billing

As a natural gas distribution company, Columbia Gas is improving the way you are billed. Columbia Gas is aligning the way it bills customers for natural gas with the value of the product (i.e., the energy), and to match the way natural gas is bought and sold in the wholesale market place.

Therm Billing Facts

  • This is only a billing conversion process, not a rate increase. Customers were previously billed based on the volume of gas consumed per month, or hundred cubic feet, and will now be billed based on the energy consumed per month, or therms (thm).
  • The volume of gas is measured in Ccf (hundred cubic feet) or Mcf (thousand cubic feet), while the heating or energy value of gas is measured in thms. Therm billing began January 31, 2012.
  • Since Columbia takes delivery of natural gas from several different sources, the heating value of gas, or British Thermal Unit (BTU) value, varies across our system, meaning that some customers receive more energy than others even though they may consume the same volume of gas.
  • BTU = the amount of energy needed to raise 1 lb. of water 1 degree Fahrenheit.
  • To convert your usage to therms, we multiply the BTU value of the gas in your area by the volume of gas (Ccf) consumed that month. For example, if the BTU content in your area is 1.05, your bill calculation will be: 1.05 BTU x 100 Ccf/month = 105 thms. Or, if the BTU content in your area is 0.95, your bill calculation will be: 0.95 BTU x 100 Ccf/month = 95 thms.
  • Therm billing maintains fair and equitable bills for customers because bills will be based upon the energy they consume. In addition, the EnergyGuide and Energy Star labels appearing on household gas appliances are based in therms so this change will make it easier for you to compare appliances.