A leading French engineering company is tapping into China's booming e-commerce market by selling energy-saving technology to logistics firms.

Fives Group, which designs and supplies machines, process equipment and production lines for the world's largest industrials, has rolled out small power-generating wheels for conveyor belts.

"Once the conveyor belt is moving, our supporting wheels start to generate power," Frederic Sanchez, chairman of Fives, said.