CHICAGO — Moody's Investors Service last week downgraded nearly $1.9 billion of debt issued by Omaha Public Power District amid the district's ongoing problems with its nuclear plant.

Moody's lowered its rating on the district's $1.5 billion of senior-lien debt to Aa2 from Aa1 and $374 million of subordinate-lien bonds to Aa3 from Aa2. The outlook is stable.

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