Volume 2 of Zero Net Energy Case Study Buildings, like Volume 1, provides a detailed discussion and analysis of a number of exemplary buildings designed and that performed at zero-net-energy use over the course of a year. There are five buildings documented in this publication. In the time between the occupancy of the buildings in Volume 1 and Volume 2, roughly three to seven years, there were advances in building technologies and the dissemination of information about successful strategies for zero-net-energy (ZNE) design.