A recent study on emissions related to U.S. natural gas transmission and storage operations by the Energy Institute of Colorado State University found that total emissions were 27.5% lower than emissions calculated by the U.S. Environmental Protection Agency’s 2012 Greenhouse Gas Inventory.
The study estimated the methane emissions from natural gas transmission and storage operations in the United States by evaluating data collected during 2012 including 2,292 on-site measurements, emissions data from 677 facilities, and activity data from 922 facilities. The report estimates that total methane emissions from transportation and storage is 1,503 Gigagrams/yr with a confidence interval of 1,220 to 1,950 Gigagrams/yr. The EPA’s Greenhouse Gas Inventory estimate is 2,071 Gigagrams/yr with a confidence interval of 1,680 to 2,690 Gigagrams/yr. The EPA Greenhouse Gas Inventory estimates an overall methane loss rate of 6.2 Tetragrams/yr which is approximately 1.3% of all methane transported in the U.S.