The Fort Calhoun nuclear power plant reached full operational power Thursday after being shut down for more than 2 1/2 years.
It took a week to restart the plant after the Omaha Public Power District received permission from the U.S. Nuclear Regulatory Commission to restore power last Tuesday, said Jeff Hanson, an OPPD spokesman.
Serious safety violations were discovered at the plant following a routine shutdown in April 2011 and flooding that summer. Federal officials monitored the facility and kept it offline until it met government regulations.
The plant about 20 miles north of Omaha underwent significant upgrades so it could run through 2033 under its operating license, OPPD President Gary Gates has said.
The utility spent more than $180 million on repairs and corrected 450 concerns. Workers were paid at least $14 million in overtime and supplemental compensation this year to get the plant running by the end of 2013.
Crews didn't run into any major problems when restart procedures began Dec. 18, Hanson said.
The utility was able to sync the plant to the power grid over the weekend, and the plant reached 100 percent power about 4 p.m. Thursday.
The 478-megawatt plant can now power more than 350,000 residential customers at their average usage rate, Hanson said.