Tennessee Valley Authority
Environmental Impact Index 2006
These charts show target figures revised in fiscal year 2006.
Environmental Impact Index
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Air Quality Indicators
Air quality expenditures
Sulfur dioxide emissions
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Prior to 2004, figures were based on calendar year.
Nitrogen oxide ozone season emissions
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Carbon dioxide emissions
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Prior to 2004, figures were based on calendar year.
Energy Efficiency Indicators
TVA buildings’ energy consumption
Energy use in TVA’s standard and industrial buildings
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Green Power Switch® blocks sold
150-kWh blocks of energy from renewable sources purchased by residents and businesses.
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Figures are cumulative.
Reduction of peak energy demand
Cumulative electricity demand reductions achieved through demand-side
management and efficiency programs.
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Figures are cumulative.
Energy-efficient new homes
Number of energy-efficient new homes through energy right® Program.
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Figures are cumulative and reflect installations of energy-efficient homes with a HERS rating of 83 or higher.
Consumption reductions
Reductions in electricity consumption through installation of energy-efficient heat pumps.
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Figures are cumulative. One gigawatt equals 1,000 megawatts.
Impacts to Land Indicators
Accidental releases to land
Releases of petroleum products or other hazardous substances at TVA facilities.
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The 2006 figure reflects a locomotive diesel spill and a hydraulic oil release.
Actuals for 2004 and 2005 were zero. Target for 2006 was zero.
Alternative right-of-way management
Transmission line ROWs managed using native vegetation to provide wildlife habitat and control invasive species.
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Waste Reduction Indicators
Fly ash, bottom ash, and gypsum utilized
Hazardous waste disposed
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Includes hazardous waste storage facility and direct shipments. The 2006 figure reflects additional tonnage from a fossil plant emission stack cleanup, reclassification of oil waste stored in suspected contaminated tanks, and sand blasting waste from a coatings removal project.
Low-level radioactive waste generated
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The 2006 figure reflects additional waste resulting from a pump seal failure and a related forced outage.
Office recyclables
Recyclable materials from office-type environments, including paper, glass, aluminum, cardboard, plastic, and steel from cans.
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Scrap metal
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The 2006 figure reflects transformer replacement delays.
Water Quality Indicators
Water discharges
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.
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Figures are cumulative
Certified marinas in Clean Marina Initiative
Figures are cumulative. Click chart for data.
Dissolved oxygen target attainment
Percentage of time dissolved oxygen targets are met at aeration systems below 16 dams
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Previously reported in milligrams/liter day.
Minimum-flow achievement
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.)
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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.)
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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.
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