Lansing, Michigan - Dean Transportation is currently operating four hybrid electric school buses in Michigan. These vehicles primarily operate in Lansing and Grand Rapids and are the first of their kind to operate within Michigan. In addition, they are the first of their kind to be manufactured in the United States. All four vehicles are manufactured by Thomas Built School Bus and have an Eaton Corporation hybrid system installed. The vehicles operate on battery for the first 15 miles per hour and on a traditional diesel engine after that.