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A net zero energy building is one whose annual energy consumption is

  • A.supplied entirely from the grid at off-peak times
  • B.matched by renewable generation on or near the site
  • C.reduced to zero by passive design alone
  • D.less than half that of a code-compliant building

Answer: B

The definition is an annual balance rather than an instantaneous one, so the building draws from the grid at night and exports by day. Reaching it requires the demand to be cut first, since generating enough to cover a wasteful building is rarely possible on the site.

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