Sustainable Development Goals
PROJECT INFORMATION AT A GLANCE:
Project Status:
Historical coal-to-biomass repowering case; biomass operation subsequently idled
Organizations Involved:
Buena Vista Biomass Power; Brahma; UC Berkeley Center for Forestry; United States Forest Service (USFS), Rocky Mountain Research Station and Missoula Fire Lab; UC Davis Biological and Agricultural Engineering; Blodgett Forest Research Station (BFRS); Placer County Air Pollution Control District
Services / Equipment:
Due Diligence, Feasibility Studies, Plant Efficiency Upgrades, Supply Chain Management, Carbon Management, Component Supply
A former coal plant. An 18 MW renewable power opportunity. A productive destination for wood residues from forestry, agriculture and urban activities. Buena Vista Biomass Power connected the reuse of industrial infrastructure with a practical question for California: how can the material removed to manage forests help supply the energy economy?
The Buena Vista biomass energy plant was repowered to use woody residues, with Klean’s project record reporting approximately 100,000 metric tonnes of annual biomass use. Its wider significance came from connecting energy production with forest-residue management and testing that connection through a field study at Blodgett Forest Research Station.
For asset owners, forest managers and infrastructure investors, the opportunity extends across the supply chain: recover value from an existing site, establish a destination for suitable residues and structure a dependable market for the energy. Buena Vista provides a practical reference for evaluating those elements together.
The Challenge
Make forest-residue removal work beyond the forest boundary
Forest treatments leave branches, tops and other woody material that needs a managed destination. Turning that material into an energy resource creates a demanding coordination task: land managers, processing contractors, hauliers and the receiving plant must work to the same fuel specification and delivery schedule.
For a developer, the relevant resource is the quantity that can reach the plant at an acceptable cost. A large regional inventory has limited commercial value without access, collection rights, suitable equipment and reliable transport. Moisture, contamination and seasonal availability also influence the amount of useful energy delivered with each load.
Buena Vista brought a second opportunity into this equation: repowering an existing lignite-fired facility. The conversion required a wood-fuel supply strategy alongside environmental review, plant modifications and arrangements for electricity sales. California’s project approval identified clean urban wood, orchard byproducts and forest-thinning residues as the intended fuel sources.
The Solution
Connect a repowered plant with a regional residue supply
The historical configuration used a circulating fluidized bed (CFB) boiler to raise steam for an 18 MW turbine-generator. Its emissions controls included selective non-catalytic reduction for nitrogen oxides and particulate collection through multiclones and a baghouse. Klean’s record also identifies limestone injection.
The integration is commercially significant. Fuel preparation and handling determine what enters the boiler; combustion and steam conditions determine energy recovery; emissions control and residue management determine the supporting infrastructure and operating requirements. Each belongs in the investment case.
Repowering also requires a disciplined assessment of the existing asset. Equipment condition, remaining service life, water systems, grid access and permit requirements determine which parts of the site retain value and which require investment. Reuse creates an opportunity to preserve useful infrastructure, with the scope established through due diligence.
Test the complete forest-to-energy route
Placer County Air Pollution Control District sponsored the Blodgett study with university and USFS researchers. It combined field observations, pile-burn measurements, plant data and emissions calculations. The comparison included processing and transport, electricity generation, and the grid electricity displaced by the project.
The published study reported 98–99% reductions across several pollutants, including fine particulate matter, carbon monoxide, nonmethane organic compounds, methane and black carbon, and approximately 20% lower CO₂-equivalent emissions against its open-burning-plus-grid-electricity baseline. Diesel used for collection, processing and transport represented 2.5% of the delivered biomass’s energy content.
These results give the project a useful evidence base: the benefits were assessed across a defined supply route and alternative disposal pathway. They demonstrate why feedstock origin and the fate of residues belong in the environmental assessment alongside plant performance.
The Outcome
A substantial repowering project with lessons that reach beyond power generation
The project combined an industrial conversion, a utility electricity market and public support for biomass utilization. A case-study presentation filed with the California Energy Commission recorded the following historical commercial framework:
| Project reference | Published basis |
|---|---|
| Power capacity | 18 MW |
| Electricity purchaser | Sacramento Municipal Utility District (SMUD), under an original 20-year PPA |
| Grid interconnection | PG&E |
| Expected annual electricity payments | Approximately US$15 million under the original commercial expectations |
| Wildland Fire Management Grant | US$2,452,450 from the U.S. Department of Agriculture |
| Employment reported | 50 construction jobs and 90 commercial service jobs |
The electricity-payment figure was an expectation, rather than a statement of revenue received. The biomass operation was subsequently idled. Its completed repowering and research work remain relevant to developers assessing how an existing energy asset can serve a regional biomass market.
Put a price on the logistics—and identify what can improve it
In the Blodgett demonstration, the historical delivered cost was US$70 per bone dry ton (BDT): US$34 for collection and processing and US$36 for transport over an average 79-mile one-way route. The plant-gate fuel value was US$45/BDT. An improved operating scenario placed approximate break-even at a 30-mile one-way haul.
For another development, the lesson is actionable: locate supply, processing and demand together wherever possible; plan truck availability with the grinder; and match deliveries to the receiving plant’s operating hours. These are investment decisions that shape the cost of every future load.
The study also examined how a value for emissions reductions could help close the supply-cost gap. Its historical US$20-per-ton CO₂e scenario added approximately US$10/BDT, halving the roughly US$20/BDT deficit after allowing for avoided pile-burning costs. That was a modelled value proposition; an actual revenue stream requires an eligible mechanism and a buyer.
Buena Vista’s broader lesson is that an energy project can provide a useful destination for residues and support land-management objectives, while its commercial durability depends on matching delivered fuel costs with contracted energy income and any separately qualified environmental value.
1. An existing power site can serve a new resource market. Coal-to-biomass repowering connected industrial infrastructure with woody residues. Asset condition, conversion scope and permissions determine how much value can be retained.
2. Environmental evidence can strengthen the development case. The Blodgett work quantified benefits against a defined alternative. That approach helps developers explain the project’s purpose and assess potential environmental value.
3. The supply route is part of the plant economics. Collection, processing, haul distance and receiving hours shape the fuel cost. Evaluate these alongside the energy buyer and contract terms before fixing the plant configuration.
These are selected achievements and lessons. Further technical and commercial insights are available through an engagement with Klean.
WHAT DO THESE LESSONS MEAN FOR YOUR PROJECT?
Klean can help asset owners, forestry businesses, municipalities and energy users assess a biomass opportunity from feedstock through to saleable energy. The starting information is practical: residue type and location, seasonal quantities, current disposal arrangements, site infrastructure and the intended energy customer.
Existing-plant reviews, repowering studies and supply-chain assignments are scoped to their objectives. New equipment developments follow Detailed Equipment Quotation (DEQ) → Detailed Feasibility Study (DFS) → Front-End Engineering and Design (FEED). The engagement package outlines the work; the paid DEQ proposal establishes the preliminary technical and commercial basis for further development.
Discuss Your Biomass Supply, Repowering or Energy Project >> GO.
ABOUT THE INFORMATION PRESENTED
This case study shares selected historical project information and research findings. Commercial agreements, process details and proprietary know-how remain subject to confidentiality and the permissions of the parties involved. Project-specific disclosures and access are addressed within an agreed engagement.
The project connects with the Sustainable Development Goals through applied research and knowledge sharing (Goal 4), renewable energy (Goal 7), employment and infrastructure (Goals 8 and 9), resource use (Goal 12), climate-related analysis (Goal 13) and forest management (Goal 15).
