Here are a few interesting articles about Zero Energy and the opportunities at the district scale. We must begin to think bigger than the individual buildings. As we think of clusters, blocks, districts, and cities new opportunities emerge. It can affect how we think of planning and design to consider the big picture - nut just in the creation of connected places but also environmental systems!
http://urbanland.uli.org/Articles/2013/Feb/BertonFortCollinsLEED?utm_source=uli&utm_medium=eblast&utm_campaign=021913
http://www.buildinggreen.com/auth/article.cfm/2010/7/30/The-Problem-with-Net-Zero-Buildings-and-the-Case-for-Net-Zero-Neighborhoods/