Exelon Energy says it has finished upgrading equipment at a northern Illinois nuclear plant.
A power failure at the Byron Generating Station caused a reactor to shut down two months ago. The company says it has replaced electrical insulators in the switchyards that help move power to and from the reactors at the site. Insulators are protective equipment that help regulate the flow of electricity. Exelon says Unit 1 was taken offline last week while upgrades were finished, and Unit 2 upgrades were finished over the weekend. Both units are back online at full power and generating electricity.