Craig-Hallum analyst Eric Stine backed a Buy rating on Clean Energy, telling investors in a research note that he believes weakness related to a competitor downgrade is overdone. While he says that the renewal of the advanced fuel tax credit, or AFTC, for 2018 is possible, it is far from a certainty and is not factored into the outlook going forward. He believers CNG will remain the dominant alternative to diesel in transit applications, with electric having a much higher first cost and being dependent on incentives. Stine has a $6 price target on Clean Energy shares.