...S&P Global Ratings assigned its '##' rating to Omaha Public Power District (OPPD), Neb.'s $373.12 million senior-lien electric system revenue bonds, 2021 series A, and $55.82 million senior-lien electric system revenue refunding bonds, 2021 series B. At the same time, S&P Global Ratings affirmed its '##' rating on parity obligations, its '##-' rating on OPPD's subordinate-lien bonds, and its 'A-1+' rating on the district's commercial paper (CP). The outlook, where applicable, is stable. The senior- and subordinate-lien bonds are secured by a pledge of the net revenues of OPPD's electric system. The district had $1.7 billion of senior- and subordinate-lien bonds outstanding, and $250 million of CP at Dec. 31, 2020. In March 2021, OPPD increased its CP authorization to $350 million (from $250 million), and secured an additional $200 million line of credit, bringing total liquidity facilities to $450 million. OPPD has covenanted that it will not issue CP in excess of amounts undrawn on the...