Renewable Energy Group Inc. announced Monday a partnership between its blended fuels division and CyRide, the transit agency serving the city of Ames and Iowa State University, to supply biodiesel blended fuel in 2015 for its CyRide bus fleet. REG Energy Services LLC began providing 350,000 gallons of fuel with biodiesel blends of up to 20 percent for CyRide’s 78 buses on Jan. 1. The agreement is REG’s first with a municipality. Ames will increase its use of biodiesel from previous years under the agreement, which provides buses with higher blends of the advanced biofuel during the summer months. The CyRide fleet serves an average of 40,000 riders daily and operates approximately 1.2 million miles a year. The city expects to reduce carbon dioxide emissions by as much as 658 metric tons this year with the increased biodiesel blends.