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If cement grinding uses 35 kilowatt hours per tonne and a plant produces 1.5 million tonnes a year, what is the annual consumption?

  • A.525 million kilowatt hours
  • B.23 million kilowatt hours
  • C.52.5 million kilowatt hours
  • D.5.25 million kilowatt hours

Answer: C

Multiplying 35 by 1.5 million gives 52.5 million kilowatt hours. Consumption on this scale is why even a small improvement in grinding efficiency repays substantial capital expenditure. Grinding is the single largest electrical load at most works.

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