renewable energy sources represent a very small share of the metro region s energy supply in march of the power supply sold within the comed service area was derived from nuclear power plants from coalfired power plants from natural gas and only small amounts of wind power biomass hydropower and assorted other sources comed however wind power is a growing industry that is attracting headquarter functions to the chicago tristate metroregion together with other great lakes states such as michigan and ohio the chicagoarea county region has one of the highest concentrations of wind energy component suppliers in the us thirteen wind industry corporations have set up their headquarters in the chicago tristate metroregion including some of the major international firms involved in turbine manufacturing and renewable project developers such as goldwind acciona suzlon nordex or eon the chicagoarea county region counts over wind companies which cover a large part of the supply chain including turbine and tower makers manufacturers of gears couplings bearings and fasteners as well legal financial and engineering consulting and diagnostic software designers elpc