The Tennessee Valley Authority expects it will cost about $2 billion to excavate leaking coal-ash storage ponds at its Cumberland River power plant, near Nashville.

Twenty-five years ago, German contracting and industrial giant Bauer AG, based near Munich, formed a corporate unit to contend with contamination on its local construction sites. Now it's a $200-million-plus global business.

The Top 200 Environmental Firms held their own in 2016, even as the election of Donald Trump, an uncertain post-Brexit Europe and still-sluggish oil prices loomed over the environmental marketplace.

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.