Various: This home, called the Riverdale NetZero Project, sold for $670,000. It generates its own heat and electricity and produces no net carbon emissions. (CBC) Edmonton’s first two zero-energy homes opened to the public Saturday. The “NetZero” homes generate zero net carbon emissions. Using solar panels for power, they use one-sixth the amount of energy per year as an average home. The homes generate all their own heat and electricity for space heating, hot water, lighting and …