sentences:  Later on the American company sold the mines to the Russian company United Company RUSAL, the world’s largest vertically integrated aluminum producer, that ensured stable fuel supply to Urals thermal power stations that provide electricity for RUSAL’s Urals plants.On November 29, 2007, a joint venture was established between UC RUSAL and Samruk-Energo (the energy branch of Kazakh state holding Samruk, to operate the coal mines of Bogatyr Access Komir.The rationale for this deal was the intention of the Kazakh government to return coal reserves into state ownership due to their strategic importance for Kazakhstan's electric power sector.