In 2006, San Francisco's Golden Gate Bridge, Highway and Transportation District, which operates the Golden Gate Bridge, made improving the energy efficiency of its facilities a top priority. Lighting in offices, shops and toll lanes were upgraded from 8 foot T12 lamps to efficient 4 foot T8 lamps, and incandescent light bulbs in offices and other facility lighting were replaced with CFLs. In addition, six HVAC units were upgraded, and water conservation upgrades were made in all facility restrooms as well as in the public restrooms. The upgrades have saved 219,000 kWh (or 14% of total power usage at the Bridge), 922,000 gallons of water and $28,000 per year. Through these actions the District has reduced CO2 emissions by 175,000 pounds.