On a flat elongated suburban site backing to a clear water creek, the house is composed of three wings, all opening to a central courtyard and pool overlooking the creek. Completed in 2010, it is one of the first client commissioned net-zero energy homes in the State of Texas.  A 24kw photovoltaics and solar hot water system is discreetly installed on the south slope of the carport.  A rainwater collection system supplies the garden with chlorine free water.  Building systems are selected for their capacity to minimize energy consumption.  The exterior walls are NEXCEM, an all natural insulated concrete form, then clad with Texas limestone.  These heavy walls become cooling thermal anchors in the warmer months, sheltered from the sun by a thin and expansive steel framed metal roof.  This passive approach to energy conservation has the added benefit of giving the home a network of wrap around porches, breezeways and exterior spaces, tailored for outdoor living & entertaining.