California contractor aims to build country's greenest houses

To drive up to the three- bedroom, two-bath bungalow being assembled in a historic residential neighborhood near downtown Folsom, you'd never suspect it's anything monumental.

But in the 600 block of Mormon Street, Folsom builder Robert Walter and the Sacramento Municipal Utility District are building what both call one of the most energy-efficient homes being constructed in the country.

The ambition is lofty. But a more practical award awaits the eventual buyer: a combined $24 or so a month for gas and electricity bills.

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