By Jarrett Renshaw & Chris Prentice, Reuters.

Marathon Petroleum Corp, the second-biggest refining company in the United States, has asked the Environmental Protection Agency (EPA) for a hardship waiver exempting one of its facilities from the nation’s biofuels law, two sources with knowledge of the application told Reuters.

The request comes as the EPA expands its use of biofuel waivers in a way that has reduced regulatory costs for the oil industry by hundreds of millions of dollars in recent months, but which has also infuriated the powerful corn lobby.