The company said the 1,400-MW boiling water reactor generated 13,400 MWh more in 2021 to beat a previous production record set in 2019. It did not specify whether the figures were gross or net.
OKG said outages amounted to 26 days in 2021, which gave an annual availability factor of 92% in 2021.
Oskarshamn-3 began commercial operation in 1985 and is scheduled to continue operation until 2045. Two other older units at the site were closed in 2016 and 2017 over concerns about their economic viability.
Sweden has five more commercial reactors in operation at two other nuclear stations: two at Ringhals, and three at Forsmark.