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Some of the 300,000 computer-controlled mirrors, each about 7 feet high and 10 feet wide, reflect sunlight to boilers that sit on 459-foot towers. The sun's power is used to heat water in the boilers' tubes and make steam, which in turn drives turbines to create electricity Tuesday, Feb. 11, 2014 in Primm, Nev. The Ivanpah Solar Electric Generating System, sprawling across roughly 5 square miles of federal land near the California-Nevada border, will be opened formally Thursday after years of regulatory and legal tangles. (AP Photo/Chris Carlson)

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Some of the 300,000 computer-controlled mirrors, each about 7 feet high and 10 feet wide, reflect sunlight to boilers that sit on 459-foot towers. The sun's power is used to heat water in the boilers' tubes and make steam, which in turn drives turbines to create electricity Tuesday, Feb. 11, 2014 in Primm, Nev. The Ivanpah Solar Electric Generating System, sprawling across roughly 5 square miles of federal land near the California-Nevada border, will be opened formally Thursday after years of regulatory and legal tangles. (AP Photo/Chris Carlson)

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Some of the 300,000 computer-controlled mirrors, each about 7 feet high and 10 feet wide, reflect sunlight to boilers that sit on 459-foot towers. The sun's power is used to heat water in the boilers' tubes and make steam, which in turn drives turbines to create electricity Tuesday, Feb. 11, 2014 in Primm, Nev. The Ivanpah Solar Electric Generating System, sprawling across roughly 5 square miles of federal land near the California-Nevada border, will be opened formally Thursday after years of regulatory and legal tangles. (AP Photo/Chris Carlson)

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Some of the 300,000 computer-controlled mirrors, each about 7 feet high and 10 feet wide, reflect sunlight to boilers that sit on 459-foot towers. The sun's power is used to heat water in the boilers' tubes and make steam, which in turn drives turbines to create electricity Tuesday, Feb. 11, 2014 in Primm, Nev. The Ivanpah Solar Electric Generating System, sprawling across roughly 5 square miles of federal land near the California-Nevada border, will be opened formally Thursday after years of regulatory and legal tangles. (AP Photo/Chris Carlson) **FILE**

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FILE - In this Aug. 2, 2011 file photo, Lake Travis levels approach record lows as the heat and record drought are taking its toll on the Highland Lakes, near Austin, Texas. The impacts of record-breaking heat and years of low or no rainfall can be felt years after the dry spell passes, and Texas is now struggling with some of the worst impacts of a historic one-year drought that crippled the state’s lakes, agriculture and water supplies. More than 50 percent of Texas remains in drought despite more consistent rainfall in the past two years, climatologists said. (AP Photo/Austin American Statesman, Ralph Barrera, File) AUSTIN CHRONICLE OUT, COMMUNITY IMPACT OUT, MAGS OUT; NO SALES; INTERNET AND TV MUST CREDIT PHOTOGRAPHER AND STATESMAN.COM

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FILE - In this Aug 3, 2011 file photo, Texas State Park police officer Thomas Bigham walks across the cracked lake bed of O.C. Fisher Lake, in San Angelo, Texas. The impacts of record-breaking heat and years of low or no rainfall can be felt years after the dry spell passes, and Texas is now struggling with some of the worst impacts of a historic one-year drought that crippled the state’s lakes, agriculture and water supplies. More than 50 percent of Texas remains in drought despite more consistent rainfall in the past two years, climatologists said. (AP Photo/Tony Gutierrez, File)

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Ice and snow cover Main Street at the Statehouse in Columbia, S.C., early Wednesday, Feb. 12, 2014. Gov. Nikki Haley again declared a state of emergency as emergency officials worried that as much as an inch of ice accumulating on trees and power lines Wednesday into Thursday could knock out powers to thousands, especially in the Midlands. (AP Photo/Mary Ann Chastain)

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Ice and snow cover Interstate 26, early Wednesday, Feb. 12, 2014, in Columbia, S.C. Gov. Nikki Haley again declared a state of emergency as emergency officials worried that as much as an inch of ice accumulating on trees and power lines Wednesday into Thursday could knock out powers to thousands, especially in the Midlands. (AP Photo/Mary Ann Chastain)

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In the path of a storm: Traffic crawls along a slick roadway Wednesday in Charlotte, N.C. The winter storm that coated swaths of the South in ice and snow is poised to bring traffic problems and power outages to the D.C. region. Story, A12. (Associated Press photographs)

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Gov. Jerry Brown talks about the politics of California’s drought in a brief visit to the 47th Annual World Ag Expo Wednesday, Feb. 12, 2014, in Tulare, Calif. Brown’s visit followed his emergency drought declaration in January and comes before President Barack Obama’s visit to the region planned for Friday. At left is Karen Ross, secretary of the California Department of Food and Agriculture. (AP Photo/Scott Smith)

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A road sign reads: "Serious Drought Help Save Water" on Interstate 5 in Los Angeles Wednesday, Feb. 12, 2014. Calif. Gov. Jerry Brown has formally proclaimed California in drought emergency, calling on Republicans and Democrats in Congress to compromise on legislation to help the state's drought-stricken agricultural heartland. (AP Photo/Damian Dovarganes)

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This undated photo provided by the U.S. Fish and Wildlife Service shows Modoc suckers, found only in desert creeks of southern Oregon and Northern California. The service has proposed taking the tiny fish off the endangered species list, saying it has recovered enough to no longer need protection. The U.S. Fish and Wildlife Service said the Modoc sucker no longer is in danger of extinction, after nearly 30 years of recovery efforts, Wednesday, Feb. 12, 2014. (AP Photo/U.S. Fish and Wildlife Service)

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This undated photo provided by the U.S. Fish and Wildlife Service shows a Modoc sucker, found only in desert creeks of southern Oregon and Northern California. The service has proposed taking the tiny fish off the endangered species list, saying it has recovered enough to no longer need protection. Recovery efforts have focused on stopping overgrazing on public and private lands and fencing livestock out of creeks. (AP Photo/U.S. Fish and Wildlife Service)

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A university worker plows the parking lot outside the Dean E. Smith Center at the University of North Carolina in Chapel Hill, N.C., Wednesday, Feb. 12, 2014 prior to a basketball game between Duke and North Carolina. A major winter slammed into North Carolina Wednesday, turning homebound commutes that typically take minutes into hours-long ordeals as traffic slowed to a slippery slog and threatening to leave many areas dark because of power outages. (AP Photo/Gerry Broome)

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Pedestrians maneuver a stairway outside the Dean E. Smith Center at the University of North Carolina prior to a basketball game between North Carolina and Duke in Chapel Hill, N.C., Wednesday, Feb. 12, 2014. (AP Photo/Gerry Broome) ** FILE **

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Vehicles travel north on Interstate 85 on Wednesday, Feb. 12, 2014, in Greenville, S.C. A second winter storm in two weeks pummeled South Carolina on Wednesday, cutting power to tens of thousands and prompting Gov. Nikki Haley to ask President Barack Obama to declare the state a federal disaster area. (AP Photo/Rainier Ehrhardt)

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Heavy ice brings down pine trees in downtown Augusta, Ga., during a winter storm on Wednesday, Feb. 12, 2014. Across the South, winter-weary residents woke up Wednesday to a region encased in ice, snow and freezing rain, with forecasters warning that the worst of the potentially "catastrophic" storm is yet to come. (AP Photo/The Augusta Chronicle, Jon-Michael Sullivan)

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FILE - In this Dec. 5, 2012 file photo, a sewer cover is seen along the shore of Lake Champlain in Burlington, Vt. In a hearing Wednesday, Feb. 12, 2014, Vermont Environmental Conservation Commissioner David Mears outlined a proposal where the state would enhance water quality rules to limit non-wastewater runoff into Lake Champlain. (AP Photo/Toby Talbot, File)

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A Georgia Department of Transportation sign warns drivers of winter weather as they travel a bleak section of Highway 141 on Wednesday, Feb. 12, 2014, in Norcross, Ga. The scene is the opposite of what drivers experienced two weeks ago when every major artery of metropolitan Atlanta was clogged during the last winter storm. (AP Photo/John Amis)

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A man waves while walking along the center of Clayton Street on Wednesday, Feb. 12, 2014, in Athens, Ga. A combination of sleet, snow and freezing rain was expected to coat power lines and tree branches with more than an inch of ice between Atlanta and Augusta. (AP Photo/Athens Banner-Herald, AJ Reynolds) MAGS OUT; TV OUT: MANDATORY CREDIT