# Temelín Nuclear Power Plant development

> Developing situation record from CLSTR: https://clstr.news/situations/temeln-nuclear-power-plant-development
> Updated: 2026-10-29T08:19:51.000Z. Sources: 7. Developments: 2.

The Temelín Nuclear Power Station is undergoing various infrastructure and expansion developments managed by ČEZ. 

In October 2026, ČEZ advanced plans for a new small modular reactor (SMR) project by submitting Environmental Impact Assessment documentation to the Czech Ministry of the Environment. This project involves installing a 470-megawatt Rolls-Royce SMR technology reactor, with the goal of having the unit operational by the mid-2030s. The company is also considering additional SMR sites in Dětmarovice and Tušimice.

Concurrently, ČEZ is investing hundreds of millions of Czech koruna to replace shunt transformers at the plant to ensure long-term operational stability for up to 80 years. The replacement of five new units is scheduled to occur during planned fuel replacement outages in 2027 and 2028. These new components will feature advanced real-time diagnostics and improved voltage regulation to support critical systems.

## Timeline

### 2026-10-29: Temelín Nuclear Power Plant to replace key transformers

Temelín Nuclear Power Plant will invest hundreds of millions of koruna to replace key transformers, ensuring reliable internal power and supporting the plant's long-term goal of 80 years of operation.

7 sources. https://clstr.news/cluster/temeln-nuclear-power-plant-to-replace-key-transformers

### 2026-10-12: ČEZ advances Temelín SMR project with environmental filing

ČEZ has submitted environmental documentation for a new 470MW Rolls-Royce SMR at the Temelín Nuclear Power Station, with results expected by the end of next year.

6 sources. https://clstr.news/cluster/ez-advances-temeln-smr-project-with-environmental-filing

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Cite as: Temelín Nuclear Power Plant development. CLSTR, https://clstr.news/situations/temeln-nuclear-power-plant-development