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Cramer Interviews Westport Innovations CEO Demers

Cramer continued to speak up for natural gas on Wednesday's "Mad Money." Not only is it a "cheaper, cleaner and more abundant bridge fuel" than anything else on the market, he noted it also helps lessen the U.S.'s dependence on foreign oil. Most importantly, though, Cramer sees a lot of money-making potential in nat gas.

Take Westport Innovations , for example. A speculative play on nat-gas fueled vehicles, it transforms petroleum-fueled engines into ones that can run on compressed or liquefied natural gas. On Tuesday, it announced it's currently in talks with General Motors to develop natural gas-powered engines for light-duty vehicles. This news raised investors' hopes for the firm's future and sent the stock up over 11 percent on the day.

"Now, this is only a development agreement," Cramer said. "But it's definitely a step in the right direction."

Since Cramer first backed Westport back in January 2010, shares have seen a total gain of 109 percent. The stock has also risen by a rapid 21 percent from three weeks ago. Though the stock was getting slammed by what many saw as a disappointing first quarter, the development agreement with GM has once again sparked investor optimism.

Still, Cramer said not to get too excited when risk is right around the corner. The stock may be trading at unequivocal highs right now, but the company is going to need many more positive deals to secure a solid future for itself. Westport's current business partners include four of the seven largest diesel fuel makers on earth, such as Cummins , Volvo, Hyundai and Weichai in China. In May, the company signed a deal with Caterpillar to develop new natural gas fuel technologies for possible use on CAT's large engines.

To find out more about the firm's outlook for the future, Cramer chatted with company CEO David Demers. To see the full interview, watch the video.

Call Cramer: 1-800-743-CNBC

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