What are zero energy homes + commercial buildings?

A zero energy home or building is one in which energy efficiency is maximized, the capacity to meet the building’s energy needs with renewable energy sources has been enabled, and site and community-based renewables are prioritized.

This video by the U.S. Department of Energy explains what a zero energy buildings is and how it works.

What are zero energy ready buildings?

Zero energy ready buildings are designed and built to the same high energy efficiency standards as zero energy buildings. They are highly efficient buildings that generate as much energy as they use over the course of a year;