The following video is from Thursday's Digging for Value in which host Alison Southwick and Motley Fool energy analysts Joel South and Taylor Muckerman dig into the most exciting stories in energy investing today.

Valero Energy (NYSE:VLO) has asked the Obama administration to waive the ethanol mandate in gasoline immediately, due to the recent skyrocketing costs of the Renewable Identification Numbers. In this segment, Joel takes a look at the EPA and Valero, and discusses how this mandate and the rising cost of ethanol are hurting American refiners today.