The Bighorn solar project array will feature three-quarters of a million panels generating 300 megawatts, negating 433,000 metric tons of carbon dioxide emissions per year—the equivalent of removing 92,100 fuel-burning cars from the road.

The 1,800 acre project in Pueblo will be the largest single-customer solar energy plant in the world.

Steel is vital to the world economy. It is also the third-largest contributor on the global greenhouse gas budget, and producing steel domestically removes the carbon-emissions of transit over the ocean from big steel producers or iron miners like China or South Africa.

"This project proves that even hard-to-abate sectors like steel can be decarbonized when companies come together with innovative solutions," said Kevin Smith, CEO of Lightsource BP, Americas—the firm which will build and own the array. "It's a great example of partners tackling complex issues that U.S. industry is facing today while, at the same time, preserving jobs in the manufacturing sector."