Trump said he'll bring engery prices down by 50% within a year if he's elected. Fact or fantasy?

The US is producing record amounts of fossil fuels right now, but he's going to open up more federal lands to drilling and fracking, and he says that'll cut engery prices by 50% within a year.

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50% cheaper would bring down costs lower than they were than at any time during Trump's term.
Trump said he'll bring engery prices down by 50% within a year if he's elected. Fact or fantasy?
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