The German firm holds 54.5% interest in OKG, and wants to close two out of the three existing reactors at the facility before 2019.
While the 638MW Oskarshamn-2 reactor is likely to be closed as early as possible, decommissioning for the 473MW Oskarshamn-1 reactor has been planned between 2017 and 2019, reports Reuters.
E.on’s decision is influenced by Sweden’s plan to raise taxation for nuclear installations from August.
Fortum, which is a partner of E.on in the OKG projet, is not in favour of the proposed closure of the nuclear units. The firm wants the reactors to be operational until the end of their scheduled life.
Fortum nuclear and thermal power executive vice-president Tiina Tuomela said: "Oskarshamn 1, which is the oldest nuclear power unit in Sweden, has applied for the environmental permit to transfer to the service mode.
"Decisions on the future of Oskarshamn 1 will not be topical in the next few years, and the unit could continue its production at the current capacity level."
Oskarshamn 2 has recently been upgraded to increase its production capacity.
Tuomela said: "Considering the investments made as well as our strong expertise as a nuclear operator and a global service provider, we see that there are other measures to be taken to ensure safe and reliable production at Oskarshamn 2 until the end of its planned lifetime.
Image: The Oskarshamn power plant has three nuclear units. Photo: courtesy of OKG Aktiebolag.