Integrating Co-digestion, Battery, LGens, and Cogen; How Machine Learning Can Help SVCW Achieve Energy Neutrality

Presentation Description: Silicon Valley Clean Water (SVCW), a Joint Powers Authority serving over 225,000 customers in the San Francisco Bay peninsula, has consistently prioritized optimizing energy generation and recovery in its wastewater treatment processes while upholding the highest effluent quality standards. Guided by a 2009 Energy Master Plan, SVCW has implemented key infrastructure investments that are advancing its journey toward net-zero energy consumption and circular economy principles, resulting in substantial greenhouse gas emissions reductions.

SVCW’s strategy for achieving its ambitious sustainability goals comprises three integrated approaches:

Part A: Expanding Organic Co-digestion for Increased Biogas Production
As a regional leader, SVCW established the first FOG (fats, oils, and grease) co-digestion program in the Bay Area. Since 2009, it has partnered effectively to implement food waste co-digestion, thereby reducing greenhouse gas emissions and complying with California’s SB 1383 mandates. This section presents the program’s evolution, key partnerships, and the progressive design-build delivery of recent initiatives, supported partially by a $4 million CalRecycle grant. It also addresses permitting and feedstock supply challenges and the solutions developed.

Part B: Innovative Power Generation Using Linear Generators
SVCW’s cogeneration system, installed in 2011, uses Jenbacher internal combustion engines for heat and on-site power generation from biogas. Building on this, SVCW is commissioning a 1.25 MW power plant utilizing next-generation linear generators to harness additional biogas from co-digestion. This segment outlines the design-build-operate implementation, grant and incentive funding, and discusses air permitting and PG&E interconnection hurdles, along with how these were overcome.

Part C: Energy-Centric Process Optimization
Enhancements such as a Battery Energy Storage System and influent storage via gravity pipe, alongside process optimizations—reduced digester mixing, peak demand shifting, and maximizing gas generation during high-demand periods—demonstrate SVCW’s holistic approach. Advanced tools like machine learning and real-time dashboards enable integrated energy management, reducing demand and maximizing production during peak periods.

In summary, SVCW’s comprehensive methodology and collaborative partnerships have delivered tangible progress toward energy neutrality. The innovations and lessons featured will provide valuable insights for agencies aspiring to achieve sustainability, embrace circular economy models, and realize net-zero energy targets.