Hillabee Expansion

Historically low natural gas prices and the public’s desire for cleaner energy have fueled the growing popularity of natural gas. Clean-burning natural gas currently produces one-third of all electric generation and heats about half of all U.S. homes – and those numbers continue to climb.

Transco pipeline

Transco pipeline

Williams, a leading energy infrastructure company, has developed an expansion of its existing Transco pipeline to serve the growing need for natural gas by local utilities, industries and power generators in the southeastern United States.   The Hillabee Expansion Project will expand the existing Transco pipeline’s capacity in Alabama beginning in July 2017, supplying gas to the Sabal Trail pipeline.

The Hillabee Expansion is being constructed in three phases, adding a total of approximately 1,131,000 dekatherms per day (dt/d) of pipeline capacity to the Transco system by 2021 (enough natural gas to meet the needs of over 4 million American homes annually).

  2017 2020 2021
Looping 20.1 miles 10.6 miles 12.8 miles
Compression 68,500 hp 19,500 hp 0 hp
Capacity 818 Mdt/d 206 Mdt/d 106 Mdt/d

 

Scope

Hillabee thumb

Project location map

As part of the Hillabee Expansion, Williams will construct eight new pipe sections (loops),  a new compressor facility in Choctaw County, Ala., as well as making modifications to other existing compressor stations and valve sites. The pipeline loops vary in length and are expected to parallel the existing Transco pipeline, adjacent to the existing utility corridor. By maximizing the use of our existing transmission corridor, our goal is to minimize the impact on property owners and the environment.

Major facility modifications:

Phase I (2017 In-Service)
State County Scope
AL Choctaw New 32,000 hp compressor facility
AL Dallas Existing compressor facility modifications
AL Autauga / Chilton 4.6 miles of 48-inch pipe
AL Coosa 5.3 miles of 42-inch pipe
AL Coosa 2.55 miles of 42-inch pipe
AL Coosa Existing compressor facility modifications
AL Tallapoosa 7.6 miles of 42-inch pipe

 

Phase II (2020 In-Service)
State County Scope
AL Choctaw 6.73 miles of 42-inch pipe
AL Dallas Existing compressor facility modifications
AL Chilton Existing compressor facility modifications
AL Chilton 3.92 miles of 42-inch pipe

 

Phase III (2021 In-Service)
State County Scope
AL Choctaw 5.48 miles of 42-inch pipe
AL Chilton Existing compressor facility modifications
AL Chilton / Autauga 7.48 miles of 42-inch pipe
Permitting Process

Before any new pipeline facilities can be constructed, Williams must first obtain a federal Certificate of Public Convenience and Necessity from the Federal Energy Regulatory Commission (FERC), in addition to various state and local permits. In November 2014 Williams submitted its 7c Certificate Application to FERC (CP15-16). The project was approved by the FERC in February 2016. All project documentation can be accessed at the FERC website by referencing the docket number.

Schedule
  • November 2013 – Pre-filing process began
  • November 2013 – Detailed civil surveys began and are ongoing
  • January 2014 – Open houses and informational meetings
  • First quarter 2014 – FERC scoping hearings
  • November 2014 – Submit 7(c) application to FERC
  • February 2016 — FERC approval
  • July 2017 – Phase I in-service
  • Second Quarter 2020 – Phase II in-service
  • Second Quarter 2021 – Phase III in-service