West County Wastewater (WCW) is pivoting from a traditional treatment model toward a resource-recovery and renewable-energy framework through its "Clean & Green" energy improvement project. Developed in partnership with OPTERRA Energy Services, the initiative targets significant operational efficiencies and environmental mitigation for the Richmond, California-based utility. By integrating advanced energy systems and solids processing technology, the project aims to achieve nearly $83 million in lifetime savings while reducing greenhouse gas emissions by more than 90 percent. This strategic overhaul positions the facility to manage extreme weather events more effectively while transforming wastewater residuals into Class A EPA-compliant biosolids for potential reuse as fertilizer.
WCW Clean & Green Infrastructure Upgrades
The "Clean & Green" project, which commenced construction in 2022, represents a comprehensive modernization of WCW’s critical infrastructure and energy systems. Central to this development is the implementation of a microgrid designed for backup power, alongside solar energy installations and a cogeneration system. These energy-focused components are paired with electric vehicle charging stations and energy-efficient lighting upgrades to bolster the facility's overall energy resilience. Furthermore, the project includes an expansion of the existing equalization basins to improve capacity management.
A primary technical driver of this modernization is the overhaul of the solids process and handling system at the Water Quality and Resource Recovery Plant (WQRRP). This system upgrade incorporates new digesters, rotary drum thickeners, sludge dewatering equipment, a thermal dryer, and an upgraded Headworks. By transitioning away from traditional open-air sludge drying lagoons, the facility is also opening pathways for wetland restoration and potential "Living Levee" construction to mitigate rising sea levels. These technical shifts are intended to move the utility toward becoming a carbon net-negative enterprise. Beyond environmental metrics, the new solids processing capabilities are expected to reduce annual disposal costs by nearly two million dollars, significantly impacting the long-term financial profile of the district's operations.
Resource Recovery and Energy Independence Goals
The strategic objective of the WCW and OPTERRA partnership is to transition the utility into an energy-independent entity capable of navigating increasing climate volatility. By capturing energy and resources directly from the treatment process, WCW is testing a model where wastewater infrastructure serves as a dual-purpose utility for both sanitation and resource production. The ability to produce Class A EPA biosolids allows the facility to divert material from landfills and provide a reusable source of fertilizer, potentially reducing regional reliance on chemical alternatives.
For the 34,000 homes and 900 commercial and industrial businesses served by WCW, these improvements are framed as a method to secure long-term economic benefits and ratepayer stability. The WQRRP, which currently maintains a capacity of 12.5 million gallons per day (mgd), also processes sludge from the City of Richmond Treatment Plant, serving an additional population of over 100,000. This scale necessitates the high-reliability energy systems, such as the microgrid, to ensure service continuity during extreme weather. As OPTERRA Energy Services—an LS Power company—manages the deployment, the project highlights a growing trend in municipal infrastructure where energy service companies provide the technical expertise required to bridge the gap between traditional utility management and advanced, decentralized energy production.
Key Takeaways
- The project is expected to deliver nearly $83 million in lifetime savings and reduce greenhouse gas emissions by over 90 percent.
- New solids processing equipment, including digesters and a thermal dryer, will enable the production of Class A EPA biosolids.
- Infrastructure upgrades, such as the new microgrid and cogeneration system, are designed to increase resilience against extreme weather events.
EnergyInsyte's Take
In our view, the West County Wastewater project serves as a critical blueprint for the evolution of municipal digital and physical infrastructure. We are seeing a decisive shift where wastewater utilities are no longer viewed merely as cost centers for waste disposal, but as sophisticated resource-recovery hubs. By integrating microgrids and cogeneration, WCW is effectively de-risking its operations against grid instability and climate-driven weather events. This move toward energy independence is a strategic necessity for critical public infrastructure. Furthermore, the projected $2 million in annual disposal savings demonstrates that the transition to advanced solids handling is as much a financial imperative as it is an environmental one. For enterprise IT and infrastructure leaders, this signals that the next generation of "smart" utility management will be defined by the convergence of energy production, resource circularity, and high-resiliency hardware.
Questions & Answers
How does the new solids processing system impact WCW's operational costs?
The modernization of the solids process, which includes new digesters, rotary drum thickeners, and a thermal dryer, is expected to save the company nearly two million dollars in annual disposal costs by transforming residuals into Class A EPA biosolids.
What specific technologies are being deployed to ensure energy resilience?
To strengthen energy resilience and prepare for extreme weather, the project is implementing a microgrid for backup power, solar energy installations, and a cogeneration system.
What is the projected environmental impact of the "Clean & Green" project?
The project is expected to reduce greenhouse gas emissions by over 90 percent and move the facility toward becoming a carbon net-negative enterprise through resource recovery and renewable energy production.
What role does OPTERRA Energy Services play in this infrastructure development?
OPTERRA Energy Services is partnering with WCW to deliver the comprehensive energy and infrastructure solutions required for the project, leveraging their experience in providing distributed generation and energy services to municipalities.
Source: OPTERRA Energy Services
