
The Empire State Building is going green with $20 million worth of energy-efficient retrofits, saving $4.4 million in energy annually. The energy improvements include refurbishing existing thermopane glass windows, insulating behind radiators, updating lighting fixtures, adding controls that mix lighting with available natural light, power-saving power strips, and occupancy sensors.
Planners aim for the building, which was originally constructed in 1931, to qualify for LEED Gold status once the work is completed in 2013.