Commonwealth Edison Company (ComEd) in Illinois took home a Green Fleet Leadership Award at the Chicago Area Clean Cities’ end of year meeting.

The Green Fleet Leadership Awards are given annually to commercial and government fleets that take actions to locally reduce petroleum consumption and improve air quality, by using cleaner-burning alternative-fuel vehicles, electric vehicles, or other advanced technologies.

“The fleets we’re recognizing range from using compressed natural gas to propane to plug-in electric and hybrid vehicles, all with the goals of saving fuel, reducing emissions and saving money,” John W. Walton, chair of Chicago Area Clean Cities, said in a statement. “The fleets that we have selected operate in the Chicagoland area and are terrific examples for others to follow to learn about the advantages of clean-vehicle technologies.”

ComEd is the primary electric utility in the Chicago area, serving 4 million customers across northern Illinois, or 70% of the state population.

The utility operates more than 1,750 trucks fueled by biodiesel. In 2016, ComEd used nearly 600,000 gallons of biodiesel instead of regular diesel.