Why Buy Green Power?

In This Section

Environment

EPA's mission is to protect human health and the environment. Purchasing green power and renewable energy helps accomplish this goal by avoiding most of the environmental impacts associated with traditional power generation, such as emissions of the following gases:
- Carbon dioxide (CO2) is a product of fossil fuel combustion. Burning fossil fuels releases carbon that has been stored underground for millions of years into the atmosphere. The carbon in these fossil fuels is transformed into carbon dioxide—the predominant gas contributing to the greenhouse effect—during the combustion process and contributes to the potential for global warming.
- Methane (CH4) is a greenhouse gas that remains in the atmosphere for approximately 9-15 years. Although carbon dioxide is more prevalent in the atmosphere (there is approximately 200 times more carbon dioxide than methane in the atmosphere), methane is more than 20 times more effective in trapping heat than carbon dioxide over a 100-year period. Sources of methane include organic waste decomposition in municipal solid waste landfills and agricultural production. Methane is also emitted during the production and transport of coal, natural gas, and oil.
- Nitrogen oxides (NOx) is the generic term for a group of highly reactive gases, all of which contain nitrogen and oxygen in varying amounts. Nitrogen oxides form during fuel combustion, the primary sources being motor vehicles, electric utilities, and other industrial, commercial, and residential sources. These emissions contribute to smog, global warming, and a number of human respiratory hazards. Nitrogen oxides can also lead to acid rain, as emissions react with other substances in the air to form acids which fall to earth as precipitation.
- Sulfur dioxide (SO2) is emitted when burning fossil fuels, such as coal or oil, or when extracting gasoline from oil or metals from ores. Over 65 percent of sulfur dioxide released to the air, or more than 13 million tons per year, comes from electric utilities, especially those that burn coal. As with nitrogen oxides, sulfur dioxide emissions are associated with a number of harmful respiratory effects and react with other substances in the air, causing acid rain.
Furthermore, the production cycle of conventional fossil fuels causes additional environmental harm in the form of resource extraction and processing of fossil fuels.

Security

Purchasing green power can help reduce America’s dependence on foreign fuel sources because green power is a domestic energy source, whereas conventional power is in part produced from imported fossil fuels, such as petroleum or natural gas.
Renewable fuels are inexhaustible and can be used so that fossil fuels are kept in reserves for times of need.

Economics

Green power provides a hedge against risks posed by electricity price instability. Wind, geothermal, hydro, and solar energy are not subject to the rise and fall of fuel costs and therefore they can offer a fixed price over the long term.
Buying green power supports the U.S. share of the growing renewable market, with the potential for billions of dollars to be invested in the U.S. economy and enlarge the job market.

Federal Requirements

Executive Order 13423

The U.S. Department of Energy has not yet published final renewable energy guidance for Executive Order (E.O.) 13423. Based on initial draft guidance, E.O. 13423 requires that 50 percent of current renewable energy purchases come from new renewable sources—sources that have been developed after January 1, 1999. While the Energy Policy Act of 2005 (EPAct 2005) set a renewable energy goal, E.O. 13423 is the first federal mandate to require agencies to purchase a certain percentage of new renewable energy. Final renewable energy guidance is expected later in 2007. Learn more about EPA's E.O. 13423 energy reduction requirements.

EPAct 2005

Each federal agency must consume renewable energy in amounts no less than:
- 3 percent in FY 2007 through FY 2009
- 5 percent in FY 2010 through FY 2012
- 7.5 percent in FY 2013 and thereafter
Learn more about EPA's EPAct 2005 energy and water reduction and renewable energy requirements.

E.O. 13123:

Expand use of renewable energy at federal facilities, striving to have 2,000 solar energy units installed by 2000 and 20,000 units installed by 2010. Learn more about EPA's E.O. 13123 energy reduction and greenhouse gas emission reduction requirements.

Outreach

Educate the public on the importance of purchasing renewable energy.
Demonstrate federal commitment to green power.
Reinforce importance of social responsibility.