On-site energy generation is achieved through photovoltaic arrays on the various rooftops, as well as through a wind turbine tower at the north façade. This façade was specifically designed to accelerate the wind and optimize energy production, as well as to celebrate the use of on-site renewables in support of SFPUC’s mission. Ned Kahn’s Firefly art installation on the face of the wind tower further celebrates the potential of wind as a natural resource, as clear polycarbonate panels flicker in the wind and trigger the flickering of tiny LED lights at night.