Greenhouse Gas Emissions

In October 2009, the Environmental Protection Agency (EPA) adopted its mandatory Greenhouse Gas Reporting Rule that requires annual greenhouse gas emissions to be calculated and reported for facilities subject to the rule.

These requirements include:

  • Emissions resulting from methane leaks, releases and operational processes at our natural gas plants, natural gas storage facilities and compressor stations along our natural gas transmission pipelines; and
  • Annual leak surveys at these facilities using thermal imaging cameras, flame-ionization devices and other leak-detection equipment.

Based on threshold levels in 2015, we reported emissions from 27 facilities totaling approximately 47.3 million metric tons of carbon dioxide equivalents (CO2e.)

Emissions at our facilities result from natural gas combustion from running natural gas compressor engines and process heaters, plus additional methane and carbon dioxide emissions from equipment leaks, venting and other processes common to natural gas systems, which are at or above the 25,000 metric tons of CO2e per-year threshold set by the EPA.


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