The metro-region’s large architectural and engineering community overall accounted for more than 39 000 jobs in 2009, including more than 4 000 LEED-certified experts in the City of Chicago alone. There are currently 1 600 members of the Chicago chapter of the US Green Building Council (USGBC, 2009). Energy-related activities account for the second-largest share of the green sector (11%), and include nuclear energy, biofuels/biomass, wind, battery technologies, smart grid, solar photovoltaic, renewable energy services, solar thermal, geothermal and fuel cells.