Williams Partners LP (NYSE: WPZ) has placed into service an expansion of its Transco pipeline system to increase natural gas delivery capacity to New York City by 115,000 dekatherms per day in time for the 2017-2018 heating season.

The New York Bay Expansion provides additional firm transportation capacity for much-needed incremental natural gas supplies to National Grid (NYSE: NGG), the largest distributor of natural gas in the northeastern U.S. The company provides service to 1.8 million customers in Brooklyn, Queens, Staten Island and Long Island.

The New York Bay Expansion Project included horsepower additions at three existing Transco compressor facilities, in addition to modifications to existing meter and regulator stations in New Jersey, Pennsylvania and New York.

The New York Bay Expansion is the fourth of Williams Partners’ projected five fully-contracted Transco expansion projects to be placed into service this year, combining with Gulf Trace, Hillabee Phase 1 and the Dalton Expansion to add more than 2.5 million dekatherms per day capacity to the Transco pipeline system so far in 2017. The partnership continues to target a fourth-quarter 2017 in-service date for its fifth Transco expansion in 2017—the Virginia Southside II project.