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Nashville International Airport has turned a former quarry on the site into the water source for a lake plate geothermal cooling system that is cutting energy consumption by more than 50%.

State's mandate for 1,600 MW by 2027 is the biggest in the U.S.

As it searches for new tenants for a $113-million port terminal in New Bedford, Mass., that was set to stage huge turbines for the now-halted Cape Wind offshore wind project, a state agency faces a $23-million breach-of-contract lawsuit from the 28-acre facility’s two key contractors, Cashman Dredging and Marine Co. and Weeks Marine Inc., over scope deficiencies.

Blame the U.K.’s June 23 vote to leave the European Union—the Brexit referendum—as well as construction challenges, for hesitation in the development of lightweight floating foundations for wind turbines sited in deep waters off Scotland and England.

One of the largest single investments in Alliant Energy’s multiyear plan to create cleaner and more efficient ways to generate electricity will be a $1-billion expansion of an Iowa wind farm, adding 500 MW of capacity to the 200 MW now in place.