The U.S. Energy Information Administration is out with a new report today that says fully 1/3 of the major interstate natural gas pipelines that serve the northeast will be bidirectional by 2017–in just three years. That is, instead of bringing gas to the northeast, those same pipelines will be flow gas out of the northeast. Why? One word: Marcellus. Here’s the expert analysis by some of the best minds in the business (and we sincerely mean that)…