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What powers Doc Brown’s DeLorean by 2015 in "Back to the Future Part II"?

Back to the Future Part II publicity still
Copyright by Universal Studios and other relevant production studios and distributors. // Moviestillsdb.com
In "Back to the Future Part II," Doc Brown whisks Marty and Jennifer into the far-off future of... ten years ago, 2015, where hoverboards glide through the air and Nike makes self-lacing shoes. The DeLorean time machine is ready for action in this futuristic world, and Doc seems pretty confident about his ability to keep the flux capacitor running without any of the logistical headaches he faced back in 1985. What powers Doc Brown's DeLorean by 2015?