Zero Net Energy
Zero Net Energy means on an annual basis, a home is designed to produce all the energy it consumes.
These homes are not 'guaranteed' to be Zero Net Energy (or Positive Energy), they require reasonable care by the occupants in their decisions about energy use. But at the very least they will have very low.
The 'side effects' of a home designed to the goal of Zero Net Energy can include very clean, healthy indoor air quality, very comfortable temperature and humidity, "Passive Survivability" in the event of a power failure, freeze protection, and in general a sense of security and well-being in a time of an uncertain energy future.
An overview of the 1st place winner in the Massachusetts Zero Energy Challenge is here. An overview of the 2nd place winner in the Massachusetts Zero Energy Challenge is here. An overview of the 3rd place winner in the Massachusetts Zero Energy Challenge is here. An overview of a near Passive House, near Zero Net Energy home in Stow, MA is here. An overview of a Zero Net Energy home in New York State, winner of the 2014 NESEA $10K Net Zero Award is here. An overview of the first National Grid DER certified as Zero Net Energy is here. An article in Green Building Advisor about the Shelburne house is here. A portfolio of our Deep Energy Retrofit work, complete with 'all the numbers' is here.