The Renewable Fuels Association (RFA) is requesting a multi-agency investigation into what they are calling the “discriminatory and unlawful conduct” on the part of the oil industry.

In a letter sent today to the Environmental Protection Agency (EPA), the Federal Trade Commission (FTC), the Department of Energy (DoE) and the Department of Agriculture (USDA), RFA requested the agencies investigate the oil industry’s conduct that is “impeding the delivery of renewable fuels to the American marketplace.”

The focus of the letter is a recounting of recent events at Zarco 66, the first marketer in the United States to offer E15.

RFA says that when Zarco 66 began offering E15 last year, ConocoPhillips “threatened to terminate Zarco 66’s franchise agreement and charge Zarco 66 hundreds of thousands of dollars in penalties unless Zarco 66 started offering “premium” gasoline—gasoline that would replace the ethanol housed in one of Zarco 66’s fueling tanks, and a gasoline that is likely to result in far fewer sales than the ethanol blends that would be available if Zarco 66 maintained the current ethanol contents.”

“For franchisees like Zarco 66, the message that the oil industry is delivering is loud and clear: Stop selling renewable fuels, or face the consequences,” said RFA president and CEO Bob Dinneen in the letter, requesting that the aforementioned agencies “investigate and put an end to the oil industry’s highly discriminatory and unlawful conduct—conduct that is impeding the delivery of renewable fuels to the American marketplace. Otherwise, Zarco 66 will simply represent the first casualty in the oil industry’s war against the marketing and delivery of cheaper, more sustainable renewable fuels.”

Read more from RFA here.