Oil is once again approaching $100 per barrel, and that makes alternative fuel sources an attractive spot for both consumers and investors. Tesla Motors (NASDAQ:TSLA) is the clear way to play the electric vehicle market, and as technology improves, its business will grow. But the short-term growth may really be in natural gas fuel, where Westport Innovations (NASDAQ:WPRT) and Clean Energy Fuels (NASDAQ:CLNE) dominate. In the following video, energy analyst Travis Hoium covers why he likes these alternatives. 

Fool contributor Travis Hoium has no position in any stocks mentioned. The Motley Fool recommends Clean Energy Fuels, Tesla Motors, and Westport Innovations and owns shares of Tesla Motors and Westport Innovations. Try any of our Foolish newsletter services free for 30 days. We Fools don't all hold the same opinions, but we all believe that considering a diverse range of insights makes us better investors. The Motley Fool has a disclosure policy.