The building itself was designed to use 72% less energy than the company’s previous headquarter location. Twenty percent of annual energy is offset by the 750 kilowatts produced by rooftop and carport mounted photovoltaic systems. Water use was reduced by 30% and gray water provides for 100% of the irrigation. These techniques and systems help to make the California ISO Headquarters a leader in sustainability. These efforts and the energy efficiency of the building help to demonstrate that even large facilities can seek sustainability with enough planning and foresight.