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Reducing demand before adding renewable generation is the correct order for a net zero building because

  • A.the code requires the demand reduction first
  • B.generation cannot be added to an existing building
  • C.the roof area available for generation is limited
  • D.renewable generation is more expensive than any measure

Answer: C

Correct answer: the roof area available for generation is limited

A building has only so much roof and facade to put panels on, so the generation it can carry is capped. If the demand is not reduced first, that ceiling is reached before the balance is struck - and demand measures are usually cheaper per unit than generation besides.

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