Sweden

R4 nuclear reactor— 132 MW Nuclear

NuclearVerified: Feb 2026

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The R4 nuclear reactor stands as the 65th largest power generation facility in Sweden, contributing a capacity of 132 MW to the national energy mix. It is ranked 8th among Sweden's 10 nuclear plants, highlighting its role in a sector that dominates the country's energy landscape, with nuclear power accounting for a significant portion of Sweden's total capacity of 44,575 MW. With its commissioning date in 1980, this facility operates under stringent safety and efficiency standards, underscoring the advanced technology utilized in Swedish nuclear energy generation. Located in proximity to several other power facilities, including the Idbaksverket biomass plant and various hydroelectric plants like Fors and Lango, R4 is part of a diverse energy cluster that enhances the stability and reliability of the local grid. This interconnectedness is vital in a country where the energy policy heavily emphasizes low-carbon sources, with nuclear playing a central role. R4's contribution, while modest at around 0.30% of the national capacity, aligns with Sweden's ambitious climate goals. As the country aims to transition away from fossil fuels, the continued operation and potential upgrades of R4 will be pivotal in maintaining energy security and meeting growing demand. Furthermore, as Sweden explores innovations in nuclear technology, R4 may serve as a foundation for future developments in the nuclear sector, reinforcing Sweden's commitment to sustainable energy practices and ensuring a cleaner environment for generations to come.