The city of Las Vegas has saved a minimum of $5 million annually since shifting to renewable sources. Last week, Las Vegas reached its decade-long goal of fully powering the city with renewable energy, making it the biggest city in the U.S. to do so.

Las Vegas is among a few cities in the entire world that boast 100% power generation from green sources, City Manager Carolyn Goodman told reporters at the City Hall last Monday.
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The city reached the goal thanks to the opening of Boulder Solar 1, a 100-megawatt solar plant created to supply Las Vegas with clean energy sources. Now, the city’s government buildings, streetlights, and parks are fueled by renewable energy.

Since work began on the project in 2008, they’ve reduced energy emissions by thirty percent, the Las Vegas Review-Journal reports. They’ve also infuenced many casinos—MGM Resorts, Wynn, and Las Vegas Sands—to announce plans to utilize significantly more renewable energy sources.

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The city invested over $40 million in the project over the years. They’ve since installed solar panels on city buildings and have saved a minimum of $5 million on energy annually. By the end of 2017, the city plans on receiving power from the Hoover Dam, a hydroelectric power source, for the first time in history.