Clean vehicles are a big part of Uber's future. Earlier this year, it tested a fleet of electric cars in Chicago and is also working on developing driverless cars.
China has been a big focus for Uber this year. Uber raised $1.2 billion for its Chinese business from search giant Baidu in September. Chief executive Travis Kalanick also said that 30 percent of trips on Uber's app now take place in the world's second-largest economy.
The investment gives Uber another partner in China as it looks to battle the dominant player Didi Kuaidi, which was formed earlier this year when the top two ride-sharing services in the country merged.
Uber has so far struggled to shake the dominance of its rival in China. Didi Kuaidi is backed by a number of the country's biggest technology firms including Alibaba, Tencent and SoftBank and it has raised more than $4 billion. It also claims to complete more than 3 million rides per day versus Uber's 1 million in China.