Dominion submitted a pre-filing request to the Federal Energy Regulatory Commission (FERC), requesting that the commission begin its environmental review of the proposed $500 million Supply Header project.

The Supply Header project is to be built and operated by the company’s Dominion Transmission subsidiary. It would provide an additional 1.5 billion cubic feet of gas per day of firm transportation between Dominion Transmission facilities and the proposed Atlantic Coast Pipeline, primarily through looping along existing pipeline rights of way and additional compression at existing stations. The project would increase access to gas supplies from the Marcellus and Utica basins to Virginia and North Carolina end users.

The Atlantic Coast Pipeline is a separate project. It is a joint venture between Dominion, Duke Energy, Piedmont Natural Gas and AGL Resources.

The company expects to file its FERC application in September 2015, receive the FERC Certificate of Public Convenience and Necessity in the summer of 2016 and begin construction shortly afterward.