In Wisconsin, the Wisconsin Wind Works, a consortium of suppliers and vendors to wind energy counts 300 companies, with 40 companies joining in 2010 alone, and a high concentration of firms around Milwaukee (Wisconsin Wind Works, 2011). A main driver for the growing wind industry in the United States is a favourable investment environment, supported by tax credits, feed-in tariffs or grants, which attracts and spurs private investment. The Illinois Renewable Energy Portfolio Standard promotes wind energy by requiring that 25% of the state’s electricity be provided by renewable sources by 2025, and that 75% of that amount come from wind power.