Construction sector firms are helping corporations and utilities navigate low-cost clean-energy sources and distributed generation in a changing electricity marketplace.

While wind energy may still seem like a relatively new technology, it has matured to the point that consultants expect owners will invest about $2 billion a year to partially repower older turbines and make them more efficient. 

Chicago-based wind-generation developer Invenergy and GE Renewable Energy last month made public the construction start in Oklahoma of a 2,000-MW wind farm—set to be the largest in the U.S. and the second largest in the world.