Net Zero
When a building produces as much energy as it uses

Builders enlisted in DOE’s Builder Challenge, aimed at producing homes that are at least 30% more energy-efficient than typical new homes built to code
Source: U.S. Department of Energy

40 million
Worldwide number of working smart meters, which use the Internet to relay info about electricity use to utilities or consumers
Source: PC Magazine

Dollars saved on electricity bills in 2008 by a homeowner who used Google PowerMeter to identify power-hogging devices