Eric Frumin (right) stands in front of his solar panels on the roof of his Brooklyn home alongside architect David Cunningham (left) and AeonSolar's Allen Frishman (center). Courtesy of Eric Frumin hide caption

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SolarReserve's Crescent Dunes Solar Energy Plant, located near Tonopah, Nev., features an array of 10,347 mirrors arranged in a circle 1.75 miles across. A 640-foot-tall tower glows when the sun's energy is concentrated and directed to the top. SolarReserve hide caption

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Solar And Wind Energy May Be Nice, But How Can We Store It?

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Nevada Solar Power Business Struggles To Keep The Lights On

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The Noor I Concentrated Solar Power plant, shown on Thursday, is the first phase of a large solar thermal power plant that is intended to supply more than a million Moroccans with electricity. Fadel Senna/AFP/Getty Images hide caption

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"Solar trees," which suspend solar panels over parking spaces in San Diego, collect electricity. Generating solar power like this is just one rung on a ladder the city will have to climb to reach 100 percent renewable energy by 2035. Clare Trageser /KPBS hide caption

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San Diego Mulls Whether To Let City, Not Utility, Buy Alternative Energy

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A SolarCity employee installs a solar panel on the roof of a home in Los Angeles in 2014. California's utilities want to pay new solar customers less for their extra electricity and to add new monthly fees. Bloomberg/Bloomberg via Getty Images hide caption

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Like Night And Day: How Two States' Utilities Approach Solar

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Wind turbines dot the landscape in Mojave, Calif. The recent extension of federal tax credits is expected to give the wind and solar energy industries a big boost. Irfan Khan/LA Times via Getty Images hide caption

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Tax Breaks, Falling Costs Are Boosting Wind And Solar

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Jim and Lyn Schneider installed solar panels and batteries because bringing grid power to their house in central Wyoming was going to cost around $80,000. Leigh Paterson/Wyoming Public Radio hide caption

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When Relying On The Sun, Energy Storage Remains Out Of Reach

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Kenyan graffiti artist Bankslave created a mural of Barack Obama. The president himself will visit Kenya on Friday. One of the president's agenda items is to promote solar power. Ben Curtis/AP hide caption

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Obama Thinks Solar Power Will Boost Kenya; Kenyans Aren't So Sure

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The Solar Impulse 2 landed in Hawaii in early July. The team behind the sun-powered airplane says it will be grounded until next spring. Solar Impulse | Revillard | Rezo/Solar Impulse | Revillard | Rezo hide caption

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A photo released by Tesla shows its new Powerwall lithium-ion battery pack mounted on the wall (left) of a garage behind one of the company's electric cars. Tesla Energy hide caption

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Tesla CEO Elon Musk Unveils Home Battery; Is $3,000 Cheap Enough?

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