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David Crane, president and chief executive officer of NRG Energy, Inc. ,  looks at Solar panels above a parking lot at Arizona State University in Tempe, Arizona Tuesday June 11, 2013. (Laura Segall/ Bloomberg News)

NRG Energy makes management shifts amid sinking stock

NRG President and CEO David Crane bemoaned the “unabated selloff in our stock” earlier in November.
FILE - In this Dec. 2, 2012 file photo, smoke billows from smokestacks near Emmett, Kansas. The Environmental Protection Agency (EPA) wants to set tougher new limits on smokestack emissions from nearly two dozen states that burden downwind areas with air pollution from power plants they can't control. (AP Photo/Charlie Riedel, File)

EPA intends tougher downwind air-pollution rule in 23 states

The EPA’s proposal follows a federal appeals court ruling this summer that upheld the agency’s right to impose the clean-air standards, which block states from adding to air pollution in other localities.
The W. A. Parish power plant on Friday Sept. 5, 2014 in rural Fort Bend County, TX.  (Eric Kayne/Invision for NRG/AP Images)

Report: Texas already on path to meeting most Clean Power Plan goals

The Clean Power Plan, the final version of which was proposed in August, is intended to reduce carbon pollution from existing power by 32 percent from their 2005 levels by 2030.
EPA Administrator Gina McCarthy testifies before the House Subcommittee on Energy and Power on Capitol Hill, in Washington.  (AP Photo/Cliff Owen)

EPA set to tighten smog limits as business gears for fight

The move fulfills a long-delayed campaign promise by President Barack Obama, but sets up a fresh confrontation with Republicans already angry about the administration’s plans to curb carbon pollution from coal-fired power plants and to regulate small streams and wetlands.
Warren Buffett -- chairman, president & CEO of Berkshire Hathaway -- gestures during a 2013  interview.  (AP Photo/Nati Harnik, File)

Buffett to acquire engineering giant in $37.2 billion deal

The target company uses advanced engineering technology to make metal industrial components for jet engines and power plants as well as pipes for the oil and gas industry.
US President Barack Obama delivers remarks at a Clean Power Plan event at the White House in Washington, DC, August 3, 2015. (JIM WATSON/AFP/Getty Images)

Obama touts Clean Power Plan; opponents ready their lawsuits

President Barack Obama said the unprecedented carbon dioxide limits are the “the single most important step” America has ever taken to fight climate change.
NEWBURG, MD - JUNE 29: Two white ducks walk along the Beach at Aqualand Marina as emissions spew out of a large stack nearby at the coal-fired Morgantown Generating Station on the Potomac River on June 29, 2015 in Newburg, Maryland. Today the U.S. Supreme Court ruled against the Environmental Protection Agency's (EPA) effort to limit certain power plant emissions -- saying the agency "unreasonably" failed to consider the cost of the regulations.  (Photo by Mark Wilson/Getty Images)

Power plant operators say they’ve cut carbon emissions ahead of EPA’s Clean Power Plan

The “Benchmarking Air Emissions” report, which examined the nation’s 100 largest electric power producers, comes in advance of the final proposal of the so-called Clean Power Plan from the the Environmental Protection Agency to reduce greenhouse gas emissions from existing power plants.
(AP Photo/Matthew Brown, File)

Natural gas surpasses coal as biggest U.S. electricity source

Power companies have been installing more natural gas turbines at plants, with new regulations that restrict the emission of greenhouse gasses has added new pressure to make the switch.
(AP Photo/Matthew Brown, File)

Feds propose more safety valves for gas lines

An Associated Press investigation in 2012 uncovered more than 270 accidents dating to 1968 that could have been prevented or made less dangerous if the valves had been in place.
FILE - This Sept. 30, 2014 file photo shows the Colstrip Steam Electric Station operated by Talen Energy in southeastern Montana. Coal companies and their supporters scored a courtroom victory with a U.S. Supreme Court decision that said the Obama administration failed to take potential costs into account when it decided to regulate toxic emissions from many power plants, Monday, June 29, 2015. (AP Photo/Matthew Brown, File)

After mercury ruling, scrutiny of Obama climate rules grows

The high court’s ruling undermined Obama administration regulations targeting mercury and other hazardous air pollutants — a different set of regulations from the greenhouse gas limits that Obama is counting on to slow the effects of global warming.