Phillips 66, Partners Sanction Western Gateway Pipeline to Arizona

Phillips 66 and its partners have formally sanctioned the Western Gateway pipeline project, a 1,300-mile conduit intended to move oil from Texas to Arizona, according to a report from Rigzone. The project was sanctioned on Wednesday, August 12, 2026.

The pipeline, as reported by Rigzone, is designed to create a new fuel supply path originating from St. Louis, Missouri, and expanded Gulf Coast origin points, with destinations in Arizona and California. This represents a significant new piece of infrastructure aimed at serving markets in the southwestern United States.

For Bakken operators, the development of new long-haul pipeline capacity out of key market hubs like St. Louis and the Gulf Coast can have indirect but important implications. Increased pipeline connectivity from these hubs to demand centers on the West Coast can help alleviate broader market congestion and provide more optionality for crude oil shipments originating in or passing through the Midwest.

The Bakken formation in North Dakota is a major supplier of light sweet crude to the national market, much of which flows to the Cushing, Oklahoma, and Gulf Coast hubs. Enhanced pipeline routes from those hubs to California and Arizona could potentially open up or strengthen market outlets for Bakken crude that travels south. While the project's direct origin points are in Texas and Missouri, its ultimate effect is to increase the overall pipeline network's reach, which can benefit all shippers seeking access to West Coast refiners.

The sanctioning of the Western Gateway project underscores continued industry investment in pipeline infrastructure despite a shifting energy landscape. For North Dakota producers, the health of the national pipeline grid is critical for maintaining competitive access to diverse, high-value markets across the United States.