Phillips 66 (PSX) has quietly expanded the fractionators at its Sweeny complex on the Texas Gulf Coast, contributing much-needed new capacity to handle growth in Permian NGL supply.
PSX disclosed the expansion in its 4Q25 10-K. The company used “engineering and optimization projects” to add 125 Mb/d of capacity at the Sweeny hub, boosting total frac capacity to 675 Mb/d from 550 Mb/d.
The addition has received little attention in the market, despite representing one of the larger recent expansions in Gulf Coast NGL infrastructure. Fractionation capacity has become a primary bottleneck as NGL production expands, particularly from the Permian Basin. In the NGL Hub Model, East Daley Analytics estimates that Mont Belvieu fracs have been running effectively full.
The expansion strengthens Sweeny as one of Phillips 66’s most strategic NGL assets. Located south of Houston, the Sweeny hub combines large-scale fractionation capacity with storage, refining, petrochemical processing and export infrastructure. The integration allows PSX to participate across multiple segments of the NGL value chain, and creates an alternative to Mont Belvieu as a market center for fractionation.
The timing of the project is notable given continued growth in Gulf Coast NGL supply. While the 125 Mb/d expansion helps temporarily ease the regional bottleneck, growing supply continues to push volumes toward Mont Belvieu.
Phillips 66 is developing a second project, the 100 Mb/d Coastal Bend fractionator, that it expects to enter service in 1Q28. The two expansions will add 225 Mb/d of frac capacity to handle NGL supply growth on the Gulf Coast, mainly from the Permian and Eagle Ford. Even with the two projects, East Daley forecasts NGL production will continue to outpace frac capacity, keeping Gulf Coast fracs running strong
The figure above shows our outlook in the NGL Hub Model for fractionation demand and utilization on the Texas Gulf Coast. Even with the new Sweeny expansion, we estimate regional fracs are running at capacity. We forecast utilization will average 101% in 2026 and 99% in 2027.
Rather than alleviating the bottleneck, the under-the-radar PSX project underscores how quickly new infrastructure will be filled as Gulf Coast NGL supply continues to expand. – Sam Chen Tickers: PSX.
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