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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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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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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The Two-Way

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

With a sleek surface and a depth of only about 7 inches, the Powerwall can be mounted on a garage wall or another surface, indoors or outside.

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Leo Thompson stands in front of his isolated home, where he has lived for 35 years, on the Navajo Nation reservation. Like an estimated 18,000 Navajos homes, his his isn't connected to the electrical grid — it's a half-mile from the nearest line — and until recently Thompson used a generator for power. Ibby Caputo for NPR hide caption

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Renewable energy sources — such as the Eolo wind park about 75 miles south of the Nicaraguan capital, Managua — generate about half of the country's electricity. Officials predict that figure could rise to 80 percent within years. Inti Ocon/AFP/Getty Images hide caption

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Without horsepower, they rely on human power: Mother and daughter-in-law Sheela and Sunita Devi shred sugarcane into feed. Ibrahim Malik for NPR hide caption

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Elizabeth Ebinger in Maplewood, N.J., bought her solar panels, while neighbor Tim Roebuck signed a 20-year lease. Both are happy with the approach they took, and both are saving money on energy bills. Jeff Brady/NPR hide caption

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A worker installs solar panels atop a government building in Lakewood, Colo. The industry has added more than 80,000 jobs since 2010, according to The Solar Foundation. John Moore/Getty Images hide caption

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Solar energy panels on a roof in Marshfield, Mass. Stephan Savoia/AP hide caption

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Vera Cole is president of the Mid-Atlantic Renewable Energy Association, a group arguing against proposed rules in Pennsylvania that would put stricter limits on how much grid-connected solar power homeowners can produce on their property. Jeff Brady /NPR hide caption

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Solar Advocates Fight Utilities Over Grid Access

Across the country the solar industry is battling utilities over the financial details of feeding electricity from renewable resources back into the power grid.

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