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The Jewel of Atlantis is the power source that ran the city Atlantis. Scrooge McDuck went on an adventure to find it in the DuckTales (2017) episode, Woo-oo! where he found and brought it back home with him to Duckburg for McDuck Water and Electric. According to Scrooge, The Jewel of Atlantis has enough energy to power Duckburg for 50 years and doesn't produce harmful waste.