This Tuesday, April 4, 2017 photo shows, the thermal energy storage tank at the University of Nebraska-Lincoln's City Campus, in Lincoln, Neb. (Francis Gardler /The Journal-Star via AP)
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This Tuesday, April 4, 2017 photo shows, the thermal energy storage tank at the University of Nebraska-Lincoln's City Campus, in Lincoln, Neb. (Francis Gardler /The Journal-Star via AP)
