Fuel costs

Biomass waste fuel costs vary widely but estimates across the USA suggest that the cost in North America is between $25/dry tonne and $60/dry tonne. Sawmill waste used close to the process plant might be obtained even more cheaply, for perhaps $17/dry tonne.

More important from a long-term perspective is the cost of energy crops. Table 15.3 shows some typical costs from around the world, but these figures should be used as a broad guide only, since the methods by which they were evaluated are not all directly comparable. As the table shows, costs can vary between $1/GJ and $5/GJ. Coal costs around $2/GJ.

In the USA, experimental projects suggest that switchgrass might be delivered for as little as $2.1/GJ and wood for $3.3/GJ. On this basis, switchgrass would be almost competitive with coal, but wood does not appear to be competitive yet.

Solar Stirling Engine Basics Explained

Solar Stirling Engine Basics Explained

The solar Stirling engine is progressively becoming a viable alternative to solar panels for its higher efficiency. Stirling engines might be the best way to harvest the power provided by the sun. This is an easy-to-understand explanation of how Stirling engines work, the different types, and why they are more efficient than steam engines.

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