A turbine spins inside the main generating hall at the Kaprun Limberg II pumped storage power plant, operated by Verbund AG, in Kaprun, Austria, on Thursday, Sept. 13, 2018. Pumped-hydro plants like Kaprun, with 830 megawatts of capacity, can store enough power to cover almost 100,000 households for more than a week. Photographer: Akos Stiller/Bloomberg
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Energy saving LED lamp in the hands of the buyer at the store
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Portland, Oregon, USA skyline at dusk with Mt. Hood in the distance.