By Brendan Sasso - 09/13/11 07:47 PM EDT
Feinstein urged companies including AT&T, Comcast, Cox, DirecTV, Dish Network, TimeWarner Cable and Verizon to phase out their energy inefficient equipment and begin offering models with power-saving modes.
"An industry initiative to distribute boxes that use electricity when necessary would greatly benefit consumers, and it could have a substantial impact on energy use almost immediately," she wrote.
She warned that if the companies did not voluntary follow her advice, the government might step in and force them to provide the energy-efficient devices.
"If such an initiative does not materialize, the Federal government will have an obligation to regulate the efficiency of these boxes in the interest of American consumers," she wrote.