Williams has placed into service an expansion of its Transco gas pipeline system, increasing firm transportation capacity into the greater Washington, DC, and Baltimore metropolitan areas by 165,000 Dth/d, the company said Tuesday.

The expansion required adding approximately 16.5 miles of 42-inch diameter pipe in Pittsylvania and Campbell counties, VA. In addition, the company replaced approximately 3.5 miles of pipe in Fairfax County, VA.

Transco is a 10,500-mile system that transports gas to markets throughout the northeastern and southeastern United States. This expansion increases the total system capacity of the Transco system to approximately 8.3 Bcf/d.

Known as the Potomac Expansion Project, the $73 million project was approved by FERC in April after receiving environmental clearance in January (see Daily GPI, April 16; Jan. 18). It supplies gas to customers of Baltimore Gas and Electric Co., Columbia Gas of Virginia and Washington Gas Light Co.

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