The licence was granted by OAH after a review of the design documentation.
The two power units will consist of Generation III+ VVER-1200 reactors, which is claimed to be first of its kind in the European Union.
Rosatom director general Alexey Likhachev said: “An enormous amount of work has been accomplished together with our Hungarian partners to prepare the documentation.
“The construction license for the new power units of the Hungarian NPP demonstrates firm belief in the Russian VVER-1200 technology, which has successfully passed the test of time and proved its safety and reliability.
“We are confident that the Paks II NPP will guarantee Hungary’s energy sovereignty for almost a century and bring European countries closer to achieving climate goals.”
Paks II is a turnkey project and is part of Hungarian-Russian intergovernmental agreement that was executed on 14 January 2014 to build a new nuclear power plant.
An engineering, procurement, and construction (EPC) contract was signed on 9 December in the same year.
The two units, namely five and six, have a guaranteed lifetime of 60 years, and Rosatom’s subsidiary ASE JSC is serving as the main contractor for the project.
It will be equipped with automated active and passive safety systems.
Pre-construction works are already underway at the site, and the two units are said to be in line with the Hungarian and European safety standards.
ASE JSC vice-president and Paks II NPP project director Alexander Merten said: “A number of key licences issued by the Hungarian authority, the OAH, for the nuclear power plant construction project is an important step towards the transition of the project to the construction stage of two state-of-the-art, safest possible nuclear power units with Generation III+ reactors, which will ensure Hungary’s stable and financially affordable electricity supply until the end of the century.”
Earlier this month, Rosatom’s engineering division Atomstroyexport finalised a contract with Korea Hydro and Nuclear Power to build turbine islands under the El-Dabaa NPP project in Egypt.