OP links to https://www.energy.gov/eere/buildings/zero-energy-ready-home-program https://www.energy.gov/eere/buildings/zero-energy-ready-home... , which explain

OP links to https://www.energy.gov/eere/buildings/zero-energy-ready-home-program https://www.energy.gov/eere/buildings/zero-energy-ready-home... , which explains that its definition of a Zero Energy Ready Home is "a high-performance home that is so energy efficient that a renewable energy system could offset most or all the home's annual energy use".