A zero net energy building is one that is optimally
eicient and, over the course of a year, generates energy
onsite, using clean renewable resources, in a quantity
equal to or greater than the total amount of energy
consumed onsite. he Task Force recognizes, however,
that currently, and even by 2030, certain buildings
will not be able to meet the deinition of zero net
energy for technological or economic reasons (or both).
herefore, the Task Force strongly recommends that
where zero net energy is truly not feasible, buildings
in Massachusetts should reduce energy loads to the
minimum practical level, produce onsite as much of the
required energy as reasonable rom renewable resources,
and purchase locally generated renewable energy to
satisfy remaining needs.