In the US state of California, which has been leading the nation in emissions reduction since 1967, the Public Utilities Commission has unveiled the “Zero Net Energy (ZNE) Action Plan for Buildings.”
It includes a transformation of the 5 billion square feet of existing commercial property, which currently consumes 38% of California’s energy, to become an overall net zero energy consumer through a combination of sustainable energy generation and energy-efficiency measures.

All new residential buildings will also be net zero energy consumers by 2030, and low-income families will be given the ability to participate in affordable energy efficiency programs by 2020. 

Bravo California for your noble green leadership! Blessed be such exemplary efforts in motivating many others toward eco-friendly homes, businesses and lifestyles.
http://www.environmentalleader.com/2010/09/02/california-rolls-out-zero-net-energy-plan-for-buildings/
http://technorati.com/lifestyle/green/article/all-new-california-commercial-buildings-to/