Environmental Impact Index 2006
Environmental Impact Index
Air Quality Indicators
Air quality expenditures
Sulfur dioxide emissions
Nitrogen oxide ozone season emissions
Carbon dioxide emissions
Energy Efficiency Indicators
TVA buildings’ energy consumption
Energy use in TVA’s standard and industrial buildings
Green Power Switch® blocks sold
150-kWh blocks of energy from renewable sources purchased by residents and businesses.
Reduction of peak energy demand
Cumulative electricity demand reductions achieved through demand-side
management and efficiency programs.
Energy-efficient new homes
Number of energy-efficient new homes through energy right® Program.
Reductions in electricity consumption through installation of energy-efficient heat pumps.
Impacts to Land Indicators
Accidental releases to land
Releases of petroleum products or other hazardous substances at TVA facilities.
Alternative right-of-way management
Transmission line ROWs managed using native vegetation to provide wildlife habitat and control invasive species.
Fly ash, bottom ash, and gypsum utilized
Hazardous waste disposed
Low-level radioactive waste generated
Recyclable materials from office-type environments, including paper, glass, aluminum, cardboard, plastic, and steel from cans.
Combination of performance in five areas related to water temperature or to discharges of certain substances such as chemicals and storm water beyond permit limits.
Certified marinas in Clean Marina Initiative
Dissolved oxygen target attainment
Percentage of time dissolved oxygen targets are met at aeration systems below 16 dams
Water flows maintained to minimize adverse impacts on aquatic life and support potable water quality. (Sum of days when a violation occurred at each of 29 locations divided by total number of days.)
Tailwater quality gap
Rating combines several measures to determine health of fish community downstream of selected TVA dams. (Difference between sum of all tailwater ratings and ideal situation where all sites are rated good.)
Reservoir water quality gap
Overall water quality conditions of major reservoirs, based on TVA reservoir ecological health ratings. (Difference between sum of all ratings and ideal rating of good for all reservoirs.)
Stream water quality gap
Overall water quality conditions of streams draining into Tennessee River system. (Difference between sum of all ratings and ideal rating of good for all streams.)
Spills to water
Spills of oil and other petroleum products or hazardous substances into water bodies.