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Welcome to Mariner
Pipeline Facts

Separating Fact from Fiction

Energy Transfer Partners, L.P. (NYSE: ETP) is a master limited partnership that owns and operates one of the largest and most diversified portfolios of energy assets in the United States. On April 28, 2017, Energy Transfer Partners (ETP) and Sunoco Logistics Partners (SXL) closed on their previously announced merger. For more details on the ETP and SXL merger, please click (here).

Strategically positioned in all of the major U.S. production basins, ETP owns and operates a geographically diverse portfolio of complementary natural gas midstream, intrastate and interstate transportation and storage assets; crude oil, natural gas liquids (NGL) and refined product transportation and terminalling assets; NGL fractionation; and various acquisition and marketing assets.

Our Mariner East project transports NGLs from the Marcellus and Utica Shales areas in Western Pennsylvania, West Virginia and Eastern Ohio to destinations in Pennsylvania, including our Marcus Hook Industrial Complex on the Delaware River, where they are processed, stored and distributed to local, domestic and waterborne markets. The first phase of the project, referred to as Mariner East 1, consisted of interstate and intrastate propane and ethane service and commenced operations in the fourth quarter of 2014 and the first quarter of 2016, respectively. The second phase of the project, referred to as Mariner East 2, will expand the total takeaway capacity to 345 thousand barrels per day for interstate and intrastate propane, ethane and butane service, and is expected to commence operations in the first half of 2017.

Mariner East 2 Energy Infrastructure Projects

Featured Project

The Mariner East projects are designed to provide needed pipeline infrastructure to transport ethane, propane and other petroleum products from the Marcellus Shale to markets in Pennsylvania and elsewhere.


The Greater Philadelphia region has coexisted for generations with pipelines carrying natural gas and natural gas liquids such as propane.

Here are some facts about the Mariner East project that will inform you about this energy infrastructure project.




Projects in the News

DEP Grants Permits for Sunoco Logistics Pipeline
Pittsburgh Post-Gazette | Feb. 13, 2017


Pennsylvania environmental regulators on Monday approved permits for a $2.5 billion natural gas liquids pipeline project traversing 17 counties across the southern tier of the state. The new lines will carry propane, butane and ethane and are expected to have an initial capacity of 275,000 barrels per day.



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