Consumer advocates took to the streets of Phoenix recently to protest against an Arizona utility's efforts to bill customers using a so-called "demand charge." If approved, Arizona Public Service would be the first utility in the country to place most of its residential customers on that kind of rate plan. Will Stone/KJZZ hide caption

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Will Stone/KJZZ

Uber But For Energy: Utility Surge Pricing Threatens Summer Cool

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Logger Greg Hemmerich and his crew feed low-value trees into a wood chipper, before bringing the chips to ReEnergy Holdings' biomass plant in Lyonsdale, N.Y. David Sommerstein/NCPR hide caption

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David Sommerstein/NCPR

Is Burning Trees Still Green? Some Experts Now Question Biomass

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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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Courtesy of Eric Frumin

One of the sites for the Department of Energy's Strategic Petroleum Reserve lies within salt caverns 2,000 feet below the ground near Freeport, Texas. Jeff Brady/NPR hide caption

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Jeff Brady/NPR

Low Oil Prices Fuel Reconsideration Of Petroleum Reserves

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U.S. Energy Secretary Ernest Moniz takes part in a press conference at the end of the 2015 meeting of the International Energy Agency Governing Board on Nov. 18, 2015 in Paris. ERIC PIERMONT/AFP/Getty Images hide caption

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ERIC PIERMONT/AFP/Getty Images

Energy Secretary Ernest Moniz Says Government Can Help Clean Energy Innovation

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Akhararat W/iStockphoto.com

Nevada Solar Power Business Struggles To Keep The Lights On

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Rob Oberg delivers oil to a home in south central Vermont. He works for Keyser Energy in Proctor, Vt., which provides heating fuel to about 5,000 customers. Nina Keck/Vermont Public Radio hide caption

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Nina Keck/Vermont Public Radio

Homeowners Who Played The Odds On Oil Heating Costs Lose Out

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The Heartland Biogas facility in Weld County, Colo., is one of the country's largest waste treatment plants that converts methane to natural gas. Rebecca Jacobson/Inside Energy hide caption

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Rebecca Jacobson/Inside Energy

From Poop To Power: Colorado Explores New Sources Of Renewable Energy

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The University of Toronto's solar-powered pond aerator could help fish farmers in Bangladesh earn up to $250 of extra income a year. Courtesy of Powering Agriculture and University of Toronto hide caption

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Courtesy of Powering Agriculture and University of Toronto

Coal fires burn early in the morning in January 2014 at a privately owned coal mine in India's Jharkand state, making the air dense with noxious smoke and dust. Forty percent of India's mineral wealth lies in Jharkhand. Johnny Haglund hide caption

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Johnny Haglund

India's Quandary: Climate Change And Coal

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A coal-bed methane well sits abandoned in a pool of water outside Gillette, Wyo. It's more expensive than it looks to clean up. Stephanie Joyce/Wyoming Public Radio hide caption

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Stephanie Joyce/Wyoming Public Radio

With Abandoned Gas Wells, States Are Left With The Cleanup Bill

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The first foundation jacket installed by Deepwater Wind in the nation's first offshore wind farm construction project is seen next to a construction crane on Monday, on the waters of the Atlantic Ocean off Block Island, R.I. Stephan Savoia/AP hide caption

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Stephan Savoia/AP

Winds Of Change? Rhode Island Hopes For First Offshore Wind Farm

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PREPA's Central Palo Seco power station in San Juan, Puerto Rico. The utility's bondholders want to raise rates. That's a challenge when the median income is about half that of Mississippi, yet the U.S. territory's energy costs are among the highest in the nation. Alvin Baez-Hernandez/Reuters/Landov hide caption

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Alvin Baez-Hernandez/Reuters/Landov

Power Problems: Puerto Rico's Electric Utility Faces Crippling Debt

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