of 1 July 2010, Tatneft had 626 filling stations, of which 490 are located on the territory of the Russian Federation and 136 are located in Ukraine. In September 2007, Tatneft formed a strategic partnership with Royal Dutch Shell to develop heavy crude oil (bitumen) production in Tatarstan. It considers similar partnership with Chevron. Through its subsidiary TANEKO, Tatneft is constructing the Nizhnekamsk refinery and petrochemical complex, which it intends to commission in phases in 2009 and 2011–2012. The complex will include of refineries with the capacity of seven million tons per year, deep oil conversion plant of 3.5 million tons per year and petrochemical plant, which will produce linear alkyl benzene for production of washing materials and oil lubricants, paraxylene and terephthalic acid for production of polyester fibers (u1074), cellophane film and bottles, and polypropylene. The complex is expected to cost US$3–3.2 billion, of which $2 billion was invested in 2008, and $1–1.2 billion would be invested in 2009. Metal Mining Wire reports that in the first half of 2013, Tatneft has installed 630 gas filling stations across Russia. In Ukraine, the number of filling stations has reached 114, and Belarus has received a total of eight gas filling stations. Tatneft delivered 730,000 tons of petroleumand gas products to its filling stations. Tatneft also upgraded many of its stations to deliver diesel fuel and eco-friendly grade five gasoline, both of which have a lower negative environmental impact than traditional gasoline. As of July 2013, Tatneft is evaluating ways to install solar panels at its filling stations in an effort to save resources. In January 2022 Federal Antimonopoly Service approved the purchase by Tatneft of six oilfield service companies of "Tagras" holding: "Tagras-Khimservis", "Mekhservis-MPO", "NKT-Servis", "KRS-Servis", "TMS-Logistika" and "Tatburneft", all based in Almetyevsk. Shareholders The main shareholder is the Republic of Tatarstan through its holding company Svyazinvestneftekhim, which holds 34% of Tatneft. The Government of Tatarstan holds also a golden share in the company. Controversies Tatneft has an ongoing dispute with the Government of Ukraine over control in Ukrtatnafta, an owner of the Kremenchuk oil refinery. Ukrainian state-owned energy company Naftogaz Ukrainy owns 43.1% of shares in Ukrtatnafta, Tatneft owns 8.6% and Government of Tatarstan owns 28.8%. 18% of the shares were transferred to two offshore companies allied with Tatneft, transaction which was not recognized by Ukrainian authorities. According to the court decision, these share were handed over to Naftogaz