The US Department of Energy Office of Energy Efficiency and Renewable Energy can now be found at http://www.eere.energy.gov/.
The US Department of Energy's Office of Energy Efficiency and Renewable Energy has updated and redesigned its Web site. Formerly known as the Energy Efficiency and Renewable Energy Network (EREN), the site is now US DOE Energy Efficiency and Renewable Energy (EERE).
The page you requested has changed, moved, or is no longer available. To locate the information you are looking for, please visit http://www.eere.energy.gov/. From the home page, you can access a selection of EERE Web sites, or you can browse from here to find the page you are looking for. In addition, you can use the search feature in the upper right corner of the home page to locate your requested page.