Word: btus
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...economies from burning the surplus grain, which is too old to be planted and is good only for fertilizer or landfill, can be large. LMU paid $11 a ton for its initial order of 650 tons of corn, and got an average heat output of 14 million BTUS per ton. Coal, by comparison, costs on the average $24 a ton and gives off no more than 23 million BTUs. The math works out to a 23% saving when corn is used...
...equals a quadrillion-1,000,000,000,000,000-BTUs...