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Poland’s planned first nuclear power plant is designed around three AP1000 reactors with about 3.75 GWe of combined capacity. Electricity from the plant is expected to travel first over dedicated block lines to a new substation near Choczewo, then inland on three overhead 400 kV lines. The plant is not operating: the project remains in permitting and preparatory phases, while grid infrastructure is also being planned and built in stages.
How will the reactors generate electricity?
The project-specific facts established by Poland’s Ministry of Energy are the reactor design and planned capacity: three AP1000 units totaling approximately 3.75 GWe. The ministry’s 2026 programme update describes a planned facility, not electricity already being generated.
In general, a nuclear power plant converts energy released by fission into electricity. The reactor provides heat, which is used to produce steam; the steam turns a turbine connected to an electrical generator. That is a general description of the conventional pressurized-water reactor process, not a detailed engineering specification confirmed in the Polish project materials cited here.
How will electricity reach the national grid?
Generation at the plant and delivery through the transmission network are separate steps. The planned immediate route is from the plant over dedicated block lines to a receiving substation in the Choczewo area. From there, three overhead 400 kV lines are planned to carry the electricity inland, according to PSE’s May 2026 announcement.
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In transmission planning, “power evacuation” means moving electricity away from a generating facility through grid infrastructure. It does not refer to a separate generation process.
What grid infrastructure is planned beyond Choczewo?
PSE’s Transmission Network Development Plan 2025–2034, published in December 2024, sets out a wider network programme around the planned plant. It identifies a new 400 kV EJ1 substation as the connection point for the nuclear units and describes the works in phases:
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- First unit: a 400 kV connection between EJ1 and the Choczewo substation, a new 400 kV substation west of the Tri-City, and associated lines linking these facilities with existing and planned 400 kV infrastructure.
- Second and third units: additional network work, including a new 400 kV substation in the Konin area and further 400 kV lines.
The plan describes connections toward the Tri-City and central Poland. It gives 2031 as a planned commissioning milestone for the new nuclear-area substation and sets later milestones for associated routes. Those are forecasts in PSE’s December 2024 plan, not guaranteed delivery dates; PSE also notes that system benefits may be achieved before formal completion of all listed works. The plan states connection conditions for a total of 3,720 MW, a figure distinct from the government’s approximately 3.75 GWe plant capacity.
What has happened, and what is still planned?
The government’s 2026 programme update says the European Commission approved the public-support model in December 2025. PEJ submitted a construction-permit application to the President of the National Atomic Energy Agency in March 2026. The Ministry of Energy separately reported that the application was filed on 31 March 2026 for the Lubiatowo-Kopalino project in Choczewo municipality.
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For the grid connection, PSE reported on 19 May 2026 that the Regional Directorate for Environmental Protection in Gdańsk had issued an environmental decision for the receiving substation on 15 May. The station is planned near Biebrowo in Choczewo municipality, on a site of close to 21 hectares. PSE said construction is planned to begin in 2030; that is a scheduled milestone, not evidence that construction has started.
Preparatory work at the plant site and activity on associated infrastructure were ongoing in the Ministry’s 2026 update. The cited status reports do not say that the plant has generated or supplied electricity.
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How much is the grid connection expected to cost?
PSE’s December 2024 transmission plan lists approximately PLN 4.3 billion in planned outlays for the network investments it associates with connecting the nuclear plant and carrying its power away. This is a planned investment total from that dated plan, not a final cost or a statement that the full amount has been spent.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Why do published capacity figures differ?
Polish legislation consolidated in 2024 identifies a maximum electrical capacity of up to 3,750 MWe for the first nuclear plant. The Ministry of Energy’s 2026 update describes three AP1000 reactors with approximately 3.75 GWe combined capacity. Since 1 GWe equals 1,000 MWe, these are broadly consistent descriptions of the planned plant’s scale, expressed with different units and wording.
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