NGL & Petchem Services

Click for larger image.

Click for larger image.

The roots of Williams’ NGL & Petchem business extend all the way back to the 1960s, when we were the first company in the industry to deliver propane via pipelines.  From those humble beginnings, we have grown to become a differentiated provider of NGL & Petchem services, from transportation, fractionation and storage of natural gas liquids to olefins production and transportation.

Our Geismar olefins plant (see video below)  can produce 1.95 billion pounds of ethylene per year in addition to 114 million pounds of propylene per year, and Williams is the only non-integrated merchant supplier of ethylene to the market. We operate nearly 1,600 miles of NGL and product pipelines and provide more than 24 million barrels of NGL storage capacity in the Mid-Continent. In the Mid-Continent, we have a fractionation capacity of 45,000 barrels of NGLs per day (this is our share of our 50 % ownership). We envision, develop and deliver valuable solutions to NGL and petrochemical markets to benefit our customers. Our partners rely on us to develop an end-to-end footprint connecting major supply areas with key demand centers and to enable growth of new demand for NGLs and olefins. In olefins, we link the growing derivative markets with the low-cost feedstocks in the United States – providing our supplying customers with preferred market options and product distribution services. Williams is competitively advantaged by our ability to connect the best supplies to the best markets.


Williams NGL/Petchem services include:

Overland Pass Pipeline

Overland Pass Pipeline includes a 760-mile natural gas liquids (NGL) pipeline from Opal, Wyo., to the Mid-Continent NGL market center in Conway, Kan., along with 150- and 125-mile extensions into the Piceance and Denver-Julesberg Basins in Colorado, respectively. Overland Pass Pipeline Company is a joint venture between Williams Partners and ONEOK Partners.

Mid-continent Fractionation & Storage (Conway, Kan.) 

ConwayToday, more than 21 million barrels of storage for ethane, propane, butane, natural gasoline and naphtha can be found at Williams’ Conway facilities known as Mid-continent Fractionation & Storage. This underground storage meets the needs of customers by providing rail, truck and high-volume product movements from three distinct facilities – Conway Underground East, Conway West and Mitchell.

Along with a 100,000-plus barrel per day fractionator, these caverns make Conway a vital hub for a major portion of hydrocarbons moving through the Midwest.

Fractionation Services

Williams operates a 107,000-barrel-per-day fractionator near McPherson, Kan. This fractionator receives mixed natural gas liquids from the gathering areas in west Texas, western Oklahoma, Colorado and Kansas. The purity products are then transported to the Midwest and the Texas Gulf Coast.

Williams operates a 42,000-barrel-per-day fractionator located near Paradis, La., that receives mixed NGLs from the Discovery pipeline, which services deepwater exploration and production in the central Gulf Coast. Williams also owns a 30 percent interest in the 60,000-barrel-per-day fractionator located near Baton Rouge, La.


Williams’ olefins business includes a Gulf olefins plant in Geismar, La.