OMAHA, Neb. (AP) — Managers have urged a utility district board to cease operating its nuclear power plant near Omaha by the end of the year.

President and CEO Tim Burke told directors of the Omaha Public Power District at their meeting Thursday that operation of the Fort Calhoun Nuclear Station “is not financially sustainable.” He told the board an analysis included consideration of market conditions and the economies of scale.

The utility serves more than 310,000 customers in 13 counties in southeastern Nebraska.

Board Chairman Mick Mines asked in April for a report on potential scenarios regarding the district’s future power resources and told senior managers to provide recommendations. The board is expected to vote on the recommendations at its June 16 meeting.