Environmental Impact Index 2005

As part of its Environmental Management System, TVA has established a set of indicators to assess and manage the beneficial and detrimental effects of its activities on air, water, land, energy use, and waste production. These indicators enable TVA to measure its progress and set targets for future improvement. A subset of these indicators is used to form the Environmental Impact Index (EII), which gives a snapshot of TVA’s overall environmental performance as measured against a baseline of fiscal year 2002.

The following graphs show targets for future years as calculated in 2005. See links below the graphs for target figures revised in 2006.

Environmental Impact Index

Click chart for data. View 2006 revisions of target figures .

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 buildings

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TVA buildings’ energy consumption

Energy use in TVA’s 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. Actuals for 2004 and 2005 were zero.

Click chart for data. View 2006 revisions of target figures.

 

Alternative right-of-way management

Transmission line ROWs managed using native vegetation to provide wildlife habitat and control invasive species.

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Net change in allocation of TVA reservoir land for environmental protection

Targets for 2004 through 2010 were zero

 

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Waste Reduction Indicators

Fly ash, bottom ash, and gypsum utilized

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Hazardous waste disposed

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Includes hazardous waste storage facility and direct shipments.

 

Hazardous waste recycled-solvent recovery

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Low-level radioactive waste generated

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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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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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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.)

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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.)

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Spills to water

Spills of oil and other petroleum products or hazardous substances into water bodies.

Click chart for data. View 2006 revisions of target figures.