The Colorado mountain town was already more than 75 percent along in its goal and achieved the full transition Thursday when it signed a contract with a wholesale energy provider.

The goal of 100 percent renewable energy was stated in the city's Canary Initiative that was launched 10 years ago.

Burlington, Vermont  and Greensburg, Kansas  were the first two cities to go to 100 percent renewable energy.

Read more about renewable energy here.

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Waymo autonomous vehicles operate across 65 square miles inside I-285 and have been involved in six incidents with Atlanta Public School buses since May. Waymo issued a recall because of their cars briefly stopping or slowing down before continuing forward while a bus was stopped and flashing its lights. (Courtesy of Atlanta Public Schools)

Credit: Courtesy of Atlanta Public Schools