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Zero energy design is a holistic{{clarify}} system integration engineering process developed in 1979. The work has been supported by the Oak Ridge National Laboratories and the U.S. Department of Energy for over thirty years.{{cite web | title = DOE and ORNL International Buildings Conference Workshop: Three Decades of Passive Solar Heating and Cooling Lessons Learned | url = http://www.ornl.gov/sci/buildings/Workshops_07.html#14 }}{{clarify}}