Case Study
Ameresco Dairy Digester — Tulare, CA
LCFS-pathway covered lagoon digester for Ameresco at a 4,500-head Tulare dairy, capturing 18,000 tCO2e annually with CARB-compliant monitoring.
The Challenge
Problem
Ameresco developed a dairy biogas project at a 4,500-head dairy in Tulare County targeting California's LCFS credit market. The project needed a covered lagoon digester that would meet CARB's rigorous monitoring and verification requirements for LCFS pathway certification. The CI score calculation demanded precise methane capture data with continuous monitoring and third-party verification protocols built into the system design.
Our Approach
Solution
EFI installed a covered lagoon digester with 60mil HDPE geomembrane, continuous gas flow monitoring, and CARB-compliant data logging for LCFS verification. The system captures dairy manure methane and routes it through biogas conditioning equipment before delivery to a pipeline injection point. All monitoring infrastructure was designed to meet LCFS pathway verification requirements from day one.
Outcomes
Results & Metrics
Key Outcomes
- LCFS pathway certification achieved
- 18,000+ tCO2e captured annually
- CARB-compliant continuous monitoring
- Biogas conditioned for pipeline injection
- CI score verified at -350 gCO2e/MJ
- Revenue from LCFS credit sales
“LCFS credit values depend entirely on verified data. EFI built the monitoring infrastructure that CARB requires right into the digester system — no retrofitting, no delays to certification.”
Ameresco Project Director, Ameresco
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