Hillabee Expansion Project

The Hillabee Expansion Project is an expansion of the existing Transco pipeline’s capacity in Alabama beginning in July 2017, supplying gas to the Sabal Trail pipeline.

Approved by the Federal Energy Regulatory Commission in February 2016, 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). The first phase of the project was placed into service in July 2017.

Scope

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.

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


 

Facility modification detail:

Phase I (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

In November 2014 Williams submitted its 7c Certificate Application to the Federal Energy Regulatory Commission. 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 CP15-16.

Schedule

  • 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