I was wondering where the data for the environmental component of IMPLAN was sourced. I work in the utility business in Chattanooga, TN and the data indicates that industry 527 - Federal Electric Utilities make up 18.8 M kg in GG for the Hamilton County TN region. This seems high. The Tennessee Valley Authority's (TVA) operation center is located in the county as well as nuclear and hydroelectric plants. TVA has operations across the state and neighboring states. I wanted to ensure this metric was correct before citing it.