to a repository in Zheleznogorsk, Krasnoyarsk Krai during 2001 and 2002. In 2008, officials at the power plant announced their intention to use CONSTOR storage casks for this purpose. Prior to the shutdown of units 3 and 4, Kozloduy NPP produced 44% of Bulgaria's electricity supply; as of March 2006, Bulgaria exported about 14% of its electricity production. Pressure to restart In January 2009, during the 2008 Bulgarian energy crisis, Bulgaria's president Georgi Parvanov suggested that Unit 3 be restarted. However, this was never pursued as an option. In principle, under the conditions of its Accession Treaty Bulgaria could request temporary derogation from its commitments in the event of serious economic difficulties arising within the first three years of membership in the union. Units 5 and 6 Units 5 and 6 are VVER-1000 reactors, construction of which finished in 1987 and 1991 respectively. By 2017 Unit 5 was to be upgraded to reach a capacity of 1,100 MWe, as part of a programme to extend the life of the unit by 30 years. In 2021 an alternative secondary fuel supply agreement was made with Westinghouse Electric Company, for supply diversification. On 30 December 2022, an agreement was made with Framatome to supply fuel and fuel assemblies for Unit 6 of the Bulgarian Nuclear Power Plant. Ownership Kozloduy Nuclear Power Plant is a subsidiary of Bulgarian Energy Holding EAD. Future expansion In 2012 Bulgaria's government decided to start the construction of a new reactor in Kozloduy after it gave up on the construction of what was supposed to be the country's second nuclear power plant in Belene. Thus, the Bulgarian government decided to install in Kozloduy the 1000 MW reactor that the Russian state company Atomstroyexport already produced for the Belene NPP. The Belene Nuclear Power Plant project was terminated in late March 2012. In October 2013, the Ministry of Environment and Water approved the environmental impact assessment report on the investment proposal for Unit 7, thereby giving a green light for its construction. A month later it was announced that construction of the reactor could begin in 2019 if full approval is granted by the Council of Ministers in 2014. The Bulgarian Energy Holding (short BEH) propose to construct a Westinghouse AP1000. Negotiations between the BEH and Westinghouse already started. In 2013 the Austrian Environment Agency prepared a report on the Bulgarian Ministry for the Environment's Environmental Impact Assessment (EIA)