By utilizing photovoltaic systems, sports complexes can reduce their reliance on conventional energy sources, subsequently lowering energy costs and minimizing environmental footprints. . In July 2010, the Bonneville Environmental Foundation (BEF) and the Natural Resources Defense Council (NRDC) published the first edition of Solar Electric Energy for Your Stadium or Arena: A Guide to Understanding the Opportunities of On-Site Solar Power Generation. Furthermore, the technology behind solar panels has advanced considerably, leading to improved efficiency rates. . Sports stadiums consume massive amounts of energy, making them ideal candidates to integrate solar, wind and other renewable energy technologies that reduce operating costs and carbon footprints and help boost a team's brand as a responsible corporate citizen. Some stadium operators are already. . The Solar One Stadium in South Korea is an ultra-modern sports complex that runs almost entirely on solar power. With a capacity of 12,000 fans, the venue features a massive array of solar panels that cover the roof and generate enough energy to power the entire facility.