Transwestern Pipeline Company, LLC owns and operates a natural gas transmission system that connects natural gas supplies in the San Juan and Rocky Mountain Basins in northwest New Mexico, southwest Colorado, the Texas-Oklahoma Panhandle, and the Permian Basin region of West Texas and Southeastern New Mexico with California, Arizona, Nevada in the West and Texas, and New Mexico on its Eastern end. Transwestern is a "natural gas company" as defined under the Natural Gas Act, and is regulated under the rules and regulations of the Federal Energy Regulatory Commission. 
Warren Petroleum, along with Monterey Oil Company and J. R. Butler founded the Transwestern Pipeline Company on March 11, 1957.
- Harvard Business School. Lehman Brothers Collection. "Transwestern Pipeline Company." Retrieved March 12, 2013.
- ENERGY TRANSFER PARTNERS, L.P. ANNOUNCES AGREEMENTS TO ACQUIRE TRANSWESTERN PIPELINE
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