Reducing energy waste has become a top priority in many states, hence the rapid development and expansion of energy efficiency (EE) programs nationwide. Many energy thought leaders ponder, "How low can we go? Can we achieve zero net energy buildings?" Yes, and zero net energy build-rn ings-which combine aggressive EE measures with renewable distributed generation such as solar-are in production in the U.S. and around the world. Massachusetts is one of several states that have found zero net energy buildings save energy costs and reduce greenhouse gas (GHG) emissions.
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