A transatlantic partnership



Coupling two existing mature technologies

The European Nuclear Cogeneration Industrial Initiative (NC2I) and the US Next Generation Nuclear Plant (NGNP) Industrial Alliance have been collaborating since 2014 on the design and regulatory framework of the first modern commercial High Temperature Gas-cooled Reactor (HTGR).

From 2017 to 2020, NC2I and NGNP carried out the GEMINI+ project together with an international consortium to demonstrate high temperature nuclear cogeneration with HTGR technology. 


In continuity of the GEMINI+ project, the GEMINI 4.0 project was launched in June 2022 to demonstrate that the GEMINI+ system can provide a global solution for the competitive and safe decarbonisation of industrial activities.


An international agreement

The initiative provides the means to combine the best engineering talents, knowledge and experience from Europe and the US, and reduce the costs of design and licensing.

An industrial application

With nuclear cogeneration an HTGR plant can be co-located in new or existing industrial facilities to produce electricity, process heat and steam, replacing fossil fuels.

A safe technology

With its unique design, HTGRs are intrinsically safe. They do not require any emergency power sources, cooling water nor operator intervention to prevent core damage and significant radioactivity release.

EU projects

Based on the system developed in GEMINI+, GEMINI 4.0 aims to pave the way for the safety demonstration and deployment of high temperature industrial nuclear cogeneration.

The GEMINI Initiative

GEMINI is a transatlantic partnership for which Europe and the US are mutualising their resources and efforts to accelerate the development of HTGRs.

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GEMINI Vision Document

In December 2014 NC2I and the NGNP Industry Alliance published a Vision Document on the GEMINI initiative. It set the basis for a successful transatlantic partnership to accelerate the development of improved, intrinsically safe and versatile nuclear energy technology.


Focus on


EUROPAIRS was a European FP7 project, which set the foundations for the establishment of NC2I. It defined the boundary operational conditions for nuclear cogeneration and established a technical roadmap for the timely development and demonstration of HTRs.

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Who we are

Nuclear Cogeneration Industrial Initiative (NC2I)

Established in 2011 as one of the three pillars of the European Sustainable Nuclear Energy Technology Platform (SNETP), the European Nuclear Cogeneration Industrial Initiative (NC2I) aims to demonstrate an innovative and competitive energy solution for the low-carbon generation of heat and electricity produced by nuclear energy. NC2I counts 9 members: AGH University, AREVA, Centrum vyzkumu Rez (CVR), Fortum, JRC, NCBJ, NRG,  Preussen Elektra and Prochem.

NGNP Industry Alliance

Created in response to the 2005 US Energy Policy Act, the Next Generation Nuclear Plant (NGNP) Industry Alliance is an international consortium promoting the development of a commercial HTGR technology. It gathers industry-leading members including potential end-users, nuclear operators, industrial suppliers and nuclear technology companies: AREVA, Dow Chemical Company, Petroleum Technology Alliance Canada, Westinghouse Electric Company…