In March 2008, Walmart opened its HE.5 prototype in Las Vegas, Nevada. The HE.5 is a western climate-specific store that is up to 45 percent more energy efficient than the baseline Supercenter. The store is part of Walmart’s high efficiency series of HE.1, HE.2 and HE.5 prototypes that incorporate many years of research, experiments, partnerships and pilots, and will ultimately become Walmart's stores of the future.