Solar panel manufacturers said they have worked to make their products easy to deploy, and several fleets said they have opted to install the panels themselves.

A growing number of fleets are turning to an alternative energy source — the sun — to help meet the growing demand for power on board their trucks.

Estes Express Lines and Dynamic Energy Complete 688 kW Rooftop Solar Project in Pennsylvania.

WEST POINT, Ga. — Just past the Alabama border, in a bit of rural Georgia filled with manufacturing plants and distribution warehouses, there's an 18-mile stretch of Interstate 85 where new technologies are being tested for what could be a green highway of the future.