Most cable TV subscribers would save money if allowed to pay for only the channels they want, a Federal Communications Commission study said Thursday, reversing the agency's earlier finding that consumers wouldn't benefit.

The analysis by FCC staff provides new support for consumer groups and conservatives pushing for a pick-and-choose pricing system to replace the bundled services offered by the cable industry. Cable companies fear that would diminish their wide distribution.

The study gives added ammunition to lawmakers and regulators who see "a la carte" as a way to clean up raunchy television by giving parents more control over the channels their children watch.

"I am pleased that the commission has concluded that 'a la carte' offering could reduce consumers' cable bills by as much as 13 percent," said Sen. John McCain, R-Ariz., who plans to introduce legislation next week to create and promote use of the la carte system.

"The report confirms what I have believed for years -- if consumers are allowed to choose the channels their families view then their monthly cable bill will be less," he said.

The National Cable & Telecommunications Association, the industry's main trade group, did not immediately comment Thursday.

Currently, Congress requires cable companies to offer a basic service package that includes local broadcast stations. The companies also offer expanded basic packages that typically include bundles of cable networks such as ESPN and CNN. For HBO, Showtime and other premium services, consumer pay an additional fee.

In Thursday's report, FCC staff said its November 2004 report was wrong to conclude that the average cable household -- which watches about 17 channels -- would likely face a monthly rate increase of up to 30 percent under a la carte.

That 2004 report reasoned that a la carte would drive up cable companies' costs for equipment, customer service and marketing and that would almost certainly be passed on to subscribers.

In fact, consumers could receive as many as 20 channels without seeing an increase in bills, the FCC staff said Thursday, blaming its earlier finding on faulty data it obtained from the cable industry.

The latest report also said in most cases subscribers would save 3 percent to 13 percent on their bills under a la carte. It noted that earlier assumptions that a la carte would lead consumers to watch two hours less of TV -- and thus decrease revenue for cable TV companies and increase costs -- lacked factual support.

"In sum, many consumers could be better off," the report said.

The support for a la carte comes as many conservative groups and lawmakers on both sides of the aisle have bemoaned the amount of violent and racy programming that children are exposed to on TV.

A la carte would allow cable subscribers to pick and pay for individual channels rather than being forced to buy packages. A parent, for example, could pick Nickelodeon and the Cartoon Network -- and not have to take MTV or other channels they may find objectionable as part of a bundled package.

FCC Chairman Kevin Martin, who was named to his post by President Bush last March, has said industry leaders need to give parents more tools to help navigate the hundreds of channels on cable and satellite TV. He has previously criticized the November 2004 FCC report as flawed.

Consumer groups on Thursday cheered the latest findings.

"We think this is really going to open up a whole new debate on the benefits of letting consumers pick their own channels on cable television," said Gene Kimmelman, senior director for public policy and advocacy at Consumers Union, which publishes Consumer Reports.