Montana is ranked among the top five states in the nation for wind power generation potential. As of 2009, Montana produced 820,924 MWh of wind-generated electricity, which represented more than three percent of all electricity generated in Montana that year. Montana is ranked first in the nation for wind speed of class 3 and above, with the majority of wind sites located in areas of low population, near communities that favor wind energy development. Montana Department of Environmental Quality maintains monitoring data from current wind-powered facilities and provides that data to people who are interested in wind energy investment opportunities in the state. The Energy Promotion and Development Division "facilitates a wind and transmission working group that consists of industry, government, academic and other stakeholders. The group has been meeting quarterly since April 2008 and it convenes to identify obstacles to transmission and wind development and to develop strategies to overcome those obstacles." Large-scale wind farms in Montana currently include Glacier wind farm near Shelby, Judith Gap wind farm in Wheatland County, Diamond Willow wind farm near Baker, MT, and Horseshoe Bend Wind Park near Great Falls. Detailed wind power maps are available on MDEQ's official site. Geothermal In May, 2005, the State of Montana, Department of Energy (DOE) and Sage Resources of Missoula, Montana established the Montana Geothermal Program. Montana's potential for large-scale geothermal energy development is still being evaluated. DOE's Geopowering the West program indicates that Montana has more than 25,000 square miles of high-potential sites and areas. Currently, Montana has 15 high-temperature sites located near White Sulphur Springs, Helena, Ennis, Bozeman, Butte and Boulder, and more than 50 designated geothermal areas of varying temperatures across the entire state. A total of twenty-seven known sites have surface temperatures ranging from 110 °F to above 149 °F, and current temperature estimates for deep reservoirs exceed 350 °F. An interactive topographic map providing details about Montana's principal geothermal sites is available on MDEQ's official site. Solar Currently, most of Montana's solar energy projects are undertaken at the residential or small-scale municipal level in homes, ranches, schools, community buildings and business. The feasibility of larger-scale solar energy generation facilities in Montana continues to be researched. Eastern Montana receives an annual average of 5 hours of full sun, and western Montana receives an annual average of 4.2 hours, so Montana has adequate solar resources to support more widespread development of solar energy