"In general, net-zero energy buildings 'combine energy efficiency and renewable energy generation to consume only as much energy as can be produced onsite,' according to the Office of Energy Efficiency and Renewable Energy.
The American Geophysical Union building, located in Dupont Circle, is currently in the process of becoming a net-zero energy building. The new building will include stormwater collection and reuse, a solar photovoltaic array, and a dedicated outdoor air system, among other renovations."
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Greater Greater Washington
https://ggwash.org/view/75547/how-much-goes-into-making-buildings-in-dc-more-energy-efficient-it-depends-on-the-building