While grills are not known for energy efficiency, Energy Star qualified commercial griddles are available.
Only thermostatically-controlled griddles may qualify for Energy Star ratings. Single- and double-sided commercial gas griddles must have a cooking energy efficiency of more than 38 percent and a normalized idle energy rate of less than 2,650 Btu per hour per foot.
Energy Star energy efficiency requirements for single- and double-sided commercial electric griddles require a cooking energy efficiency of more than 70 percent and a normalized idle energy rate of less than 320 watts per foot.
There have been some innovations to help increase the energy efficiencies of grills. Water pans can help redirect heat, while cast iron grates can help improve unit performance without increasing Btu ratings.