The State of California Franchise Tax Board cut their energy use by 11% from 2007 to 2008. Their long-term commitment to energy efficiency has included many projects including solar panel installation in 2002, extensive lighting upgrades in 2005, and improved roof insulation in 2006 which reduced peak cooling demands by up to 15%. In 2007, the Tax Board replaced their chillers and qualified for SMUD rebates for being 20% more efficient than Title 24 standards. Currently, the Tax Board is continuing its efforts, installing a waterside economizer and an automatic air conditioning control system, and implementing a server virtualization project which is expected to cut 1,813 tons of carbon per year.