[2] In January 1965, the Eastern Nebraska Public Power District was merged into OPPD, adding four counties to its service area.

In September 1973, OPPD's Fort Calhoun Nuclear Generating Station entered commercial service.

In 1996, OPPD purchased a rail line running from Lincoln to Nebraska City from BNSF Railway.

In December 2019, the board of the Omaha Public Power District voted to commit to net-zero emissions by 2050.

[8] OPPD operates other generating stations in North Omaha, Nebraska City, Valley, Elkhorn and in Cass County; coal, natural gas, oil, wind turbines, solar, and landfill gas are used to generate electricity at their power plants.