Stantec, PCL For San Francisco Biogas Megaproject

The San Francisco Public Utilities Commission (SFPUC) has awarded a US$121-million fixed price, design-build contract for the Southeast Treatment Plant Biogas Utilization Project to PCL Construction Inc. (PCL), a water and wastewater infrastructure construction company. Stantec is partnering with PCL as the lead designer.

The Biogas Utilization Project will treat the biogas generated in the new digesters to renewable natural gas (RNG) quality for injection into the nearby Pacific Gas and Electric gas pipeline. This will provide a sustainable, reliable solution for the biogas generated at San Francisco’s largest wastewater facility.

The Southeast Treatment Plant treats an average of 57 million gallons (216 liters) of wastewater per day. Biogas is a natural byproduct of the wastewater treatment process. When this project is complete, biogas will be captured, conditioned, and upgraded to RNG through the newly designed facilities. The system consists of conditioning and separation processes, which will prepare the RNG for injection into the existing gas pipeline, helping to reduce emissions and support renewable energy goals. The project will provide 100% beneficial use of the biogas generated at the Southeast Treatment Plant.

“We’re excited once again to collaborate with the San Francisco Public Utilities Commission and Stantec on a project that not only advances sustainability but also delivers long-term value to the community,” said Richard Hewitt, vice president and district manager for PCL’s Civil Infrastructure Division.

“We are pleased to partner with the PCL-Stantec team to deliver the Biogas Utilization Project for San Francisco,” said Daniela Brandao, SFPUC senior project manager. “This project will upgrade the biogas generated at the Southeast Treatment Plant to renewable natural gas for pipeline injection. It also supports California’s goals for in-state production and distribution of renewable natural gas and aligns with San Francisco’s sustainability objectives. We are looking forward to the positive impact this project will have on our community and the environment.”

The Southeast Treatment Plant has been at the heart of San Francisco’s wastewater management for over 70 years, operating 24/7 to protect the environment and public health. It is the city’s largest wastewater treatment facility, handling about 80% of San Francisco’s combined stormwater and wastewater. This project is part of the SFPUC’s generational investment in upgrading the plant’s infrastructure to continue its vital role in the community.

“As designers, we are eager to see this project make a difference in this underserved community,” said Billy Wong, regional growth leader at Stantec and design manager for the PCL/Stantec Team. “We are committed to communicating with the public so they understand these benefits and how they will help the surrounding neighborhoods.”

Stantec has begun the full-scale design of the facility. PCL is scheduled to complete construction of the project in early 2027.