Right in your own home, you have the power to reduce energy demand, and when you reduce demand, you cut the amount of resources, like coal and gas, needed to make energy—that means you create less greenhouse gas emissions, which keeps air cleaner for all of us… and saves on your utility bills! Plus, reducing energy use increases our energy security.

http://www1.eere.energy.gov/consumer/tips/pdfs/energy_savers.pdf