Reactors at Forsmark
Forsmark 1
Current power
0
/ 1,103 MW
Vattenfall AB
Mellansvensk Kraftgrupp AB
Sydkraft Nuclear Power AB
Message details
Forsmark 2
Current power
1,113
/ 1,121 MW
Vattenfall AB
Mellansvensk Kraftgrupp AB
Sydkraft Nuclear Power AB
Forsmark 3
Current power
1,140
/ 1,172 MW
Vattenfall AB
Mellansvensk Kraftgrupp AB
Sydkraft Nuclear Power AB
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About Forsmark nuclear power plant
Forsmark nuclear power plant lies on the Uppland coast in Östhammar municipality, about 150 km north of Stockholm, and is Sweden's largest nuclear plant. The three boiling water reactors Forsmark 1, 2 and 3 were commissioned in 1980, 1981 and 1985 and together generate around one sixth of Sweden's electricity.
Forsmark nuclear power plant, situated in Östhammar, Uppsala län, operates three boiling water reactors (BWR). As Sweden's largest nuclear facility, Forsmark provides significant electricity generation capacity to central and northern Sweden. Forsmark 1 was commissioned in 1980, followed by Forsmark 2 (1981) and Forsmark 3 (1985), making the facility one of Sweden's most established nuclear power plants.
Forsmark at a glance
- Location
- Östhammar, Uppsala län, Sweden
- Type
- Boiling Water Reactors (BWR)
- Operators
- Vattenfall AB, Mellansvensk Kraftgrupp AB, Sydkraft Nuclear Power AB
Frequently asked questions about Forsmark
How many reactors does Forsmark have?
Three boiling water reactors: Forsmark 1 (1,103 MW), Forsmark 2 (1,121 MW) and Forsmark 3 (1,172 MW), with a combined capacity of nearly 3,400 MW.
Who owns and operates Forsmark?
Forsmarks Kraftgrupp AB is owned by Vattenfall (66%), Mellansvensk Kraftgrupp (25.5%) and Uniper through Sydkraft Nuclear Power (8.5%). Vattenfall operates the plant.
Why is a Forsmark reactor offline?
Each reactor is normally shut down for a few weeks a year for refuelling and maintenance, usually in summer. Unplanned outages are published by the operator as UMM messages on Nord Pool and shown on the reactor card.
What happens to the nuclear waste at Forsmark?
Forsmark hosts SFR, the final repository for short-lived radioactive waste. The spent fuel repository for Sweden's used nuclear fuel, approved by the government in 2022, is also being built here.
Other nuclear power plants
Ringhals nuclear power plant
Ringhals nuclear power plant, located in Varberg, Hallands län, operates two pressurized water reactors (PWR). Ringhals 3 and Ringhals 4 are among Sweden's most powerful reactors, with a combined capacity of 2,200 MW. These Westinghouse-designed PWRs provide reliable baseload power to southern Sweden.
Varberg, Hallands län, Sweden
Pressurized Water Reactors (PWR)
Vattenfall AB, Sydkraft Nuclear Power AB
Oskarshamn nuclear power plant
Oskarshamn nuclear power plant, located in Oskarshamn, Kalmar län, operates one boiling water reactor (BWR). Oskarshamn 3 is Sweden's most powerful single reactor unit, with a capacity of 1,450 MW. This reactor plays a vital role in supplying electricity to southeastern Sweden.
Oskarshamn, Kalmar län, Sweden
Boiling Water Reactor (BWR)
Uniper SE, Fortum Sweden AB
Data sources and reliability
All power data presented on this page comes directly from official operators. Data related to maintenance and outages comes from the Nord Pool UMM platform (Urgent Market Messages), a European platform for sharing information about maintenance and outages on the power grid. This ensures accurate, up-to-date information about Sweden's nuclear power generation.
Data sources include Vattenfall AB, OKG (Oskarshamn Kraftgrupp), and the Nord Pool UMM Platform, providing comprehensive coverage of all Swedish nuclear reactors.