A legal battle in Louisiana is hobbling construction of three pipeline projects worth more than $2 billion. Yet the litigation isn’t from environmentalists: It’s spearheaded by one of the biggest natural gas pipeline operators in the US.

Energy Transfer LP wants to block three of its rivals from building pipelines to move gas from northwest Louisiana and East Texas to export terminals on the Gulf Coast. Co-founded by Texas billionaire Kelcy Warren, the industry giant argues the projects by Williams Cos., DT Midstream Inc. and Momentum Midstream, by crossing under its own conduits, would encroach on its right of ways and t

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