Flexible funds. According to the information of Dianping. com, the drivers of new energy trucks in Wuhan Metro borrow money to rent a car because of flexible funds, flexible lease period and no maintenance cost. New energy, also known as unconventional energy, refers to various forms of energy other than traditional energy, and refers to energy that has just been developed or actively studied and yet to be popularized, such as solar energy, geothermal energy, wind energy, ocean energy, biomass energy and nuclear fusion energy.