Great Britain is set to receive a private fleet of new mini-nuclear power plants starting in 2034. SGE SMR UK plans to deploy 14 reactors across three sites for this purpose. Together, the facilities are expected to generate 4.2 gigawatts of power and supply nearly eight million households. However, the project cannot begin until the sites, operators, financing, and permits have been finalized.
Mini-nuclear power plants are intended to secure the power supply
The project is backed by Warsaw-based SGE. The company is associated with Polish entrepreneur Michał Sołowow. Other partners involved include GE Vernova Hitachi, Samsung C&T, Laing O’Rourke, and Aecon; consequently, it is not solely a state-run project.
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The planned reactors utilize BWRX-300 technology. Each unit is designed to generate approximately 300 megawatts of electrical power, resulting in a combined fleet capacity of 4.2 gigawatts across 14 plants. However, SGE is prioritizing serial construction to accelerate planning and erection.
BWRX-300 passes key assessment
In the UK, the BWRX-300 has already reached Stage 2 of the Generic Design Assessment. Regulators identified no fundamental obstacles regarding safety, security, safeguards, or environmental protection. Nevertheless, each specific power plant requires further permits. Factors such as site selection, grid connection, and emergency planning also play a crucial role.
A key reference point exists in Canada, where Ontario Power Generation is already constructing a BWRX-300 unit in Darlington. Canadian regulators granted a construction license for the project in April 2025. Consequently, while the project provides valuable experience for the UK, it does not yet offer evidence based on long-term operation.
Mini-nuclear plants compete with Rolls-Royce program
SGE intends to finance the project privately. Even so, the consortium is seeking support through “Contracts for Difference.” This model aims to secure a stable electricity price without placing an upfront burden on taxpayers, unlike a direct construction subsidy.
In parallel, the UK is advancing the Rolls-Royce SMR program. Great British Energy – Nuclear and Rolls-Royce SMR signed a contract in April 2026, with the Wylfa site playing a central role. SGE’s additional mini-nuclear plants would therefore establish a second development pathway.
The question of location determines the pace
SGE wants to be included in the Advanced Nuclear Pipeline by November 2026. Locations and government support should also be clarified by mid-2027. This could be followed by an investment decision, detailed planning and approvals. However, the schedule remains ambitious.
Old power plant areas are considered particularly obvious. There are often network connections, industrial areas and skilled workers there. This could reduce costs and planning risks. For Great Britain, the fleet would be a signal against growing demand for electricity from industry, heat pumps and data centers. However, the plan remains an announcement as long as the most important contracts are missing.
Author: Blackout News
Sources: SGE (02.07.26) – The Guardian (02.07.26) – Interesting Engineering (03.07.26) – The Telegraph (02.07.26)