In 1999, Madison’s Metro Maintenance & Administration Facility began purchasing 25% of its electricity from Madison Gas & Electric’s wind power program. The additional cost to purchase the wind power is approximately $26,000 per year. Metro officials estimate that their wind power purchase is equivalent to running ten buses per year with no carbon monoxide emissions. In 2005, the city established a goal to increase the entire city’s electricity purchases to 10% renewable energy by 2006 and 20% renewable energy by 2010.