Production of Pipeline Grade Renewable Natural Gas and Value-Added Chemicals from Forest Biomass Residue

Produce high quality renewable natural gas and value-added chemicals from forest biomass

West Biofuels, LLC

Recipient

Petaluma, CA

Recipient Location

2nd

Senate District

12th

Assembly District

beenhere

$1,997,341

Amount Spent

closed

Completed

Project Status

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Project Result

The project team successfully demonstrated a complete system to convert forest biomass from high wildfire hazard severity zones to pipeline-grade renewable natural gas and value-added mixed alcohol by-products. In this novel process, renewable gas was produced from gasification-derived syngas without methanation, relying solely on advanced gas separation technologies.

The Issue

The low cost of fossil natural gas and high levels of risk associated with deploying new technologies challenge the commercial production of renewable gas (RG) from biomass like forest residues. In the past, several large-scale cellulosic biomass-to-biofuels projects have failed, increasing the rigor needed to demonstrate technical viability to stakeholders interested in financing projects. With California importing 90% of its natural gas and losing over $9 billion annually in potential in-state revenue and jobs, there is an urgent need for cost-effective, domestically produced alternatives. While the state has 47 million bone dry tons of biomass potential, only 10 million tons are currently utilized. This project addresses these challenges by demonstrating a complete system to convert forest biomass from high hazard severity zones to RG and value-added mixed alcohol by-products.

Project Innovation

West Biofuels demonstrated, at a pilot-scale, a complete system to convert forest biomass from HHZ regions to RG and value-added mixed alcohol by-products without relying on methanation. This breakthrough utilized an integrated multi-stage process including steam biomass gasification, catalytic conversion of syngas to mixed alcohols and RG, water-gas shift technology, membrane separation, and pressure swing adsorption. The demonstration provided crucial validation of technical viability, showing that renewable gas can be produced through advanced gas separation without a methanation reactor. The technology generated multiple high-value mixed alcohol products that can be used in transportation fuels or in chemical markets, improving financial performance, which advances the technology toward commercialization.

Project Goals

Convert woody biomass residue to multiple products including mixed alcohols and pipeline quality renewable gas

Develop and validate the integrated process steps demonstrating the production of gas grid-quality renewable gas

Assess commercial viability and economic feasibility of the process with focus on renewable gas cost of production

Project Benefits

This project delivered proven benefits to ratepayers, including increased natural gas reliability, lower energy costs, job creation, air emission reductions, and improved forest management and watershed protection through the successful demonstration of a commercially viable pathway for renewable gas production.

Affordability

The project validated a process that generates multiple products to reduce the cost of RG and ultimately the cost of renewable gas to consumers. Techno-economic analysis confirmed that achieving a wholesale RG cost of $12/MMBtu without credits is feasible, which is 30-50% lower than traditional renewable gas production methods that typically range from $13-30/MMBtu. This competitive pricing is achieved through revenue from co-produced mixed alcohols.

Economic Development

Environmental Sustainability

The health of the forested landscape is critical to reducing the risk of catastrophic wildfires that damage watersheds, soil retention and stability, and water holding capacity. The project develops a new outlet for forest thinning promoting sustainable forest management. The project also demonstrated renewable gas production with a carbon intensity of 5-8 grams CO2e per MJ, representing over 90% reduction compared to fossil natural gas.

Reliability

This technology provides a pathway for in-state production of renewable gas from underutilized biomass resources, enhancing energy security and reducing California's reliance on out-of-state natural gas sources subject to price volatility and supply chain disruptions. Converting 30 million tons of biomass annually could produce 170 billion cubic feet of renewable gas, potentially replacing 8% of non-renewable gas.