CHICAGO — The Omaha Public Power District is set to come to market Wednesday and Thursday with $500 million of revenue bonds, marking its largest borrowing to date.

The sale comes as the OPPD, one of the highest-rated utilities in the country, faces a major challenge tied to its nuclear plant. The Fort Calhoun Nuclear Station is about to enter its second year of an extended outage that is projected to cost more than $200 million as well as weaken the utility’s liquidity, raise its operating costs, and force it to increase the amount of debt in its $1.6 billion capital plan.

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