sector will expand further after the ongoing construction of the Hrazdan thermal plant's new and even more powerful Fifth Unit. Russia's Gazprom monopoly acquired the incomplete facility in 2006 as part of a complex agreement with the Armenian government that raised its controlling stake in the Armenian gas distribution network to a commanding 80 percent. The Russian giant pledged to spend more than $200 million on finishing its protracted construction by 2011. The new Yerevan and Hrazdan TPP facilities will pave the way for large-scale Armenian imports of natural gas from neighboring Iran through a pipeline constructed in late 2008. Armenia began receiving modest amounts of Iranian gas in May 2009. With Russian gas essentially meeting its domestic needs, it is expected that the bulk of that gas will be converted into electricity and exported to the Islamic Republic. In late December 2010, the Armenian Energy Ministry announced that the fifth block of the Hrazdan thermal power plant will go online by April 2011. Although construction on the fifth block began in the late 1980s, the Armenian government tried to unsuccessfully finish it in the late 1990s. The current project is part of a 2006 deal between Gazprom and the Armenian government, in which Gazprom acquired the incomplete facility and increased its stake in Armenia's gas distribution network, in turn pledging to spend $200 million in completing the project by 2011. Hydro Hydropower plants have an established capacity of 1,038 MW. The economically justified hydropower potential of Armenia is around 3.600 GWh/year. From this amount, 1.500 GWh/year (or about 42% of economically justified hydropower potential) has been developed already. Armenia has nine hydroelectric power plants which together accounted for one third of its domestic electricity generation. The plants are grouped along two cascades: the Sevan–Hrazdan Cascade and the Vorotan Cascade. The following table lists the details of each cascade: Planned projects Though both Iran and Armenia have long discussed opening a 140 MW, joint hydro power plant on the Artak’s River – Meghri HPP (also known as the Araks Hydro Power Plant) – by mid-2021, the project had not begun construction. Coupled with the 60 MW Loriberd HPP, these projects would add a cumulative generation of 1,012 million kWh/year. The Meghri Hydro Power Plant is a joint Armenian-Iranian project slated to be constructed on the Araks River near Armenia's southern border town of Meghri. In 2010, the energy ministers of