Solar Power Plants Generate Far Less Electricity than Predicted
(p. B1) Some costly high-tech solar power projects aren't living up to promises their backers made about how much electricity they could generate.
Solar-thermal technology, which uses mirrors to capture the sun's rays, was once heralded as the advance that would overtake old fashioned solar panel farms. But a series of missteps and technical difficulties threatens to make newfangled solar-thermal technology obsolete.
The $2.2 billion Ivanpah solar power project in California's Mojave Desert is supposed to be generating more than a million megawatt-hours of electricity each year. But 15 months after starting up, the plant is producing just 40% of that, according to data from the U.S. Energy Department.
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One big miscalculation was that the power plant requires far more steam to run smoothly and efficiently than originally thought, according to a document filed with the California Energy Commission. Instead of ramping up the plant each day before sunrise by burning one hour's worth of natural gas to generate steam, Ivanpah needs more than four times that much help from fossil fuels to get the plant humming every morning. Another unexpected problem: not enough sun. Weather predictions for the area underestimated the amount of cloud cover that has blanketed Ivanpah since it went into service in 2013.
Ivanpah isn't the only new solar-thermal project struggling to energize the grid. A large mirror-powered plant built in Arizona almost two years ago by Abengoa SA of Spain has also had its share of hiccups. Designed to deliver a million megawatt hours of power annually, the plant is putting out roughly half that, federal data show.
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(Note: the online version of the story has the date June 12, 2015, and has the title "High-Tech Solar Projects Fail to Deliver.")