On a Glidepath to Zero Net Energy Real Estate
Tucked inside the 301 page CPUC Energy Policy Report [4MB]--their first policy guideline post-AB32--is this zinger:
The California Public Utilities Commission, through its “Big Bold Energy Efficiency Strategies,” has adopted three programs designed to move all new residential and commercial construction to a zero net energy standard. The goal of this program is to reach zero net energy in residential construction by 2020 and in commercial construction by 2030.
Another interesting point was the mandatory solar--so that it could be included in the T24 calc.
Mandatory solar isn't the way to go. Shading, tilt and azimuth is a major issue in greater than 50% of residential sites, so we would end up with systems that don't pay for themselves quickly enough. The report did admit that feed-in tariffs--the way they do it in Germany and Spain--are the way to go. And this would promote higher performance design.
Price grid power high enough vs self generation--we think the curves have already crossed in PG&E territory and on the Big Island of Hawaii--add a feed in tariff, and the market will take care of the rest. Or do what Marin did, and cap residential energy use at the equivalent of a 3,500SF home, and the owner or builder needs to compensate for any additional usage through greater efficiency, or the use of pv to self generate the difference.
