U.S. Natural Gas Pipeline Capacity Increased by 6.3 Bcf/d in 2025
Natural gas pipeline projects completed in the United States in 2025 increased capacity by approximately 6.3 billion cubic feet per day (Bcf/d), according to the U.S. Energy Information Administration’s Natural Gas Pipeline Projects Tracker.
A substantial portion, 85%, or 5.3 Bcf/d, of this new capacity is dedicated to delivering natural gas to the South Central region of the United States. This region includes the Gulf Coast, where much of the nation’s growing natural gas demand, particularly from liquefied natural gas (LNG), is concentrated. The new capacity primarily connects both new and existing supply sources to consumers in the region.
Intrastate pipelines outpace interstate additions
Approximately 65% of the total pipeline capacity built in 2025 consists of intrastate pipelines, continuing the recent trend of intrastate pipeline builds outpacing interstate pipeline capacity additions. These pipelines operate primarily within state lines and are therefore not subject to the jurisdiction of the Federal Energy Regulatory Commission (FERC).
The expansion reflects ongoing investment in state-level infrastructure designed to move increasing volumes of production from key supply basins to processing hubs and export facilities, particularly along the Gulf Coast where LNG export demand continues to grow.
Haynesville formation projects add 3.5 Bcf/d
The new intrastate capacity built in 2025 largely functions as gathering systems, which are essential for transporting natural gas from producers into the wider transmission system. Two such projects completed in 2025 expanded pipeline capacity by a combined 3.5 Bcf/d to connect natural gas production from the Haynesville formation to the Gillis Hub in southeastern Louisiana.
The Louisiana Energy Gateway project added 1.8 Bcf/d, and the New Generation Gas Gathering system added 1.7 Bcf/d. Both were in service as of October 2025.
Gulf Coast expansions support LNG demand
In addition, three major projects expanded natural gas pipeline capacity for delivery to growing demand centers on the Gulf Coast by a combined 1.8 Bcf/d.
The Evangeline Pass Expansion project added 1.1 Bcf/d, and the East Lateral Xpress Project added 0.3 Bcf/d. These two projects deliver feedgas directly to Plaquemines LNG, which shipped its first cargo in 2025.
The Texas to Louisiana Pathway Project added 0.4 Bcf/d in interstate capacity from Texas through to eastern Louisiana, further strengthening regional connectivity between supply basins and LNG export facilities.
The continued buildout of pipeline infrastructure underscores the growing role of LNG exports in shaping U.S. natural gas transportation investment and highlights the Gulf Coast’s position as a critical hub for domestic consumption and global energy markets.
Note: LNG=liquefied natural gas