A hybrid electric truck is a form of truck that uses hybrid electric vehicle (HEV) technology for propulsion, instead of using only a combustion engine. According to a report from Pike Research, the global market for hybrid medium- and heavy-duty trucks and buses will increase from 9,000 vehicles sold in 2010 to more than 10 times more (more than 100,000 vehicles) in 2015. During this five-year period, the firm forecasts that a total of nearly 300,000 hybrid electric trucks will be sold worldwide.