UPDATE 4-U.S. sets first curbs on power plant carbon emissions
* First step in Obama's climate-change package
* New coal-fired power plants require tech to capture carbon emissions
* Coal, elec utilities see evidence of Obama's "war on coal"
* Industry also jittery over further EPA rules due in 2014
* Stock prices of U.S. coal companies fall
WASHINGTON, Sept 20 (Reuters) - The Obama administration on Friday announced first-ever regulations setting strict limits on the amount of carbon pollution that can be generated by any new U.S. power plant, which quickly sparked a backlash from supporters of the coal industry and are certain to face legal challenges.
The U.S. Environmental Protection Agency's long-awaited guidelines would make it near impossible to build coal plants without using technology to capture carbon emissions that foes say is unproven and uneconomic.
The rules, a revision of a previous attempt by the EPA to create emissions standards for fossil fuel plants, are the first step in President Barack Obama's climate change package, announced in June.
The revised rule contained a few surprises after the agency held extensive discussions with industry and environmental groups, raising concerns by industry that the EPA's new restrictions on existing power plants, due to be unveiled next year, will be tough.
But the regulations announced on Friday cover only new plants. Under the proposal, new large natural gas-fired turbines would need to meet a limit of 1,000 pounds of carbon dioxide per megawatt hour, while new small natural gas-fired turbines would need to meet a limit of 1,100 pounds of CO2 per MWh.
New coal-fired units would need to meet a limit of 1,100 pounds of CO2 per MWh but would be given "operational flexibility" to achieve those levels, the agency said.
The most efficient coal plants currently in operation emit at a rate of at least 1,800 pounds of CO2 per MWh.
In a speech at the National Press Club in Washington on Friday, EPA Administrator Gina McCarthy discussed the rationale behind the new rules, and defended Obama's climate plan, which opponents say amounts to a "war on coal."
"There needs to be a certain pathway forward for coal to be successful," she said, adding that "setting fair Clean Air Act standards does not cause the sky to fall."
Still, stocks of coal mining companies fell on Friday and most are down more than 25 percent for the year to date. Alpha Natural Resources Inc fell 6.2 percent to close at $6.22 on Friday. Peabody Energy Corp closed 3.1 percent lower at $18.16 and Arch Coal Inc dropped 5 percent to $4.74.
"Today's announcement ... is direct evidence that this Administration is trying to hold the coal industry to impossible standards," said Senator Joe Manchin, a Democrat from the coal-producing state of West Virginia.
The U.S. Chamber of Commerce, which represents more than 3 million businesses, said the EPA's strategies "will write off our huge, secure, affordable coal resources."
In her first major speech since being confirmed to the EPA's top job in July, McCarthy described her commitment to cleaner air in sometimes emotional terms, focused on the impact of pollution on public health.
"It's not just the elderly who suffer from air pollution. So do children - especially children in lower income and urban communities," she said. "If your child doesn't need an inhaler, then you are one very lucky parent."
Under the new rules, any new coal plant built in the United States would need to install technology to capture its carbon waste, known as carbon capture and storage (CCS).
That technology, which aims to prevent the release of large volumes of carbon into the atmosphere, is controversial because it is currently not yet operational on a commercial scale, an issue likely to be central to legal challenges to the EPA.
By giving coal plants seven years, rather than the 30 years proposed in 2012, to achieve an emissions rate below 1,100 lbs per MWh, the EPA is showing that it has full confidence in the nascent CCS technology.
"We now have enough information and confidence to say that a CCS option with coal meets the test of being the best system of emission reduction," David Doniger, policy director of the Natural Resources Defense Council's Climate and Clean Air Program, told Reuters.
The EPA previously issued a version of the rule last year but made changes to address potential legal weaknesses and to factor in more than 2 million public comments.
The EPA will launch a fresh public comment period after Friday's announcement.
It is due to issue a proposal to address emissions from existing power plants - which account for nearly a third of U.S. greenhouse gas emissions - by June 2014.
McCarthy, the EPA boss, said on Friday that people should not look at the proposal for new plants and then assume that the future rule for the existing fleet will be similar.
Canada, whose emissions policies are in focus as it waits for a U.S. decision on whether to approve the Keystone XL oil pipeline from Alberta to Texas, applauded the U.S. action on power plants. Joe Oliver, Natural Resources Minister, noted in a statement that Canada has already banned construction of new coal-fired electricity plants that use traditional technology.
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