in wisconsin the wisconsin wind works a consortium of suppliers and vendors to wind energy counts companies with companies joining in alone and a high concentration of firms around milwaukee wisconsin wind works a main driver for the growing wind industry in the united states is a favourable investment environment supported by tax credits feedin tariffs or grants which attracts and spurs private investment the illinois renewable energy portfolio standard promotes wind energy by requiring that of the state s electricity be provided by renewable sources by and that of that amount come from wind power