SACRAMENTO, Calif. — Power-hungry TVs will be banned from store shelves in California after state regulators adopted a first-in-the nation mandate to lower electricity demand.

On a unanimous vote, the California Energy Commission on Wednesday required all new televisions up to 58 inches to be more energy efficient beginning in 2011. The requirement will be tougher in 2013, and only a quarter of all TVs on the market currently meet that standard.

The California Energy Commission estimates that TVs account for about 10 percent of a home's electricity use. The concern is that the energy draw will rise by as much as 8 percent a year as consumers buy larger televisions, add more to their homes and watch them more often.

Commissioners say energy efficiency standards are the cheapest and easiest way to conserve electricity.

Some manufacturers say implementing a power standard will cripple innovation, limit choice and harm California retailers because consumers could simply buy TVs out of state or order them online.

The standards would apply to all TVs up to 58 inches, allowing increasing power use for larger TVs.

For example, all new 42-inch television sets must use less than 183 watts by 2011 and less than 116 watts by 2013.

A 42-inch Hitachi plasma TV sold in 2007 uses 313 watts, while a 42-inch Sharp liquid-crystal display, or LCD, TV draws 232 watts, according to Energy Commission research. LCDs now account for about 90 percent of the 4 million TVs sold in California annually.

Industry representatives have said the standards would force manufacturers to make TVs that have poorer picture quality and fewer features than those sold elsewhere in the U.S. California previously set efficiency requirements for other household appliances.

Utilities and environmental groups say the TV standards should head off steep increases in home electricity use and rising electric bills. An energy-efficient TV would save a household about $30 a year per set in lowered electricity costs. If all 35 million TVs watched in the state were replaced with more efficient sets, Californians would save $8.1 billion over 10 years, according to the Energy Commission report.

The standard also could help California meet the goals of its 2006 global warming law, which calls for the state to cut greenhouse gases 25 percent by 2020.