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Sustainable Energy Opportunities: Best Practices for Alaska Tribes

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Sustainable Energy Opportunities: Best Practices for Alaska Tribes ( sustainable-energy-opportunities-best-practices-alaska-tribe )

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$300 per ton for a savings of over $45,000 compared to the former oil boiler. It is estimated that the system will pay for itself in savings in 4.5 years. Wood biomass fast facts: Energy output range (BTU/hr) Local energy independence Biomass Briquettes Wood Chip 200,000 – multi-million Yes Cordwood 250,000 – 700,000 Yes Wood Pellets 35,000 – multi- million No (requires pellet processing) Capital cost Approximately $1 million $250,000 - $750,000 per unit $2,000 (residential) $10,000+ (commercial) Design considerations Large installations that require full time operation and maintenance involvement Requires a building or container to house the boiler system Can be installed in place of standard fuel oil burners; comparable in size, operation, and maintenance Briquettes are pressed logs, similar to wood pellets only larger, composed of wood chips, waste cardboard, paper, or other cellulose biomass. After pressing, the pressed logs can be used just like cordwood. Petersburg, in southeast Alaska, has been developing a briquette production system using a Biomass Briquette Press, costing $30,000 plus $45,000 per year for operating costs, which was funded by Alaska Marketplace. The project is beneficial to the community because it displaces 20,000 gallons of heating fuel per year, creates local jobs, and uses waste material that would otherwise have to be backhauled out of the community. The greatest benefit of pressing briquettes is that the process can use chipped wood, waste wood material, or any paper waste. The breadth of material that can be used makes finding a biomass source much easier and more reliable. An important lesson learned from the project is that the waste material must be dried thoroughly before pressing in order for the logs to burn cleanly and efficiently. The Petersburg system uses a heat exchanger to air dry the biomass material from the floor.  Petersburg biomass briquette fact sheet http://www.tongassfutures.net/docs/microsoft-word-petersburg-project.pdf Sustainable Energy Opportunities: Best Practices for Alaska Tribes Page 18

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