Unit 2 at India’s Kudankulam NPP in Tamil Nadu began commercial operation on 31 March, taking India's total nuclear power production capacity to 6,780MWe. The 1,000MWe achieved criticality in July 2016, was connected to the power grid in August, and reached full generation capacity in late January. The unit now begins a one-year period under the warranty of its general designer and the equipment supplier Atomstroyexport, a subsidiary of Russian state nuclear corporation Rosatom. The first two units (both AES-92 VVER-1000 reactors) were built by the Nuclear Power Corporation of India Ltd. (NPCIL), and are operated under International Atomic Energy Agency safeguards. They are supervised by Russian specialists. Russia is expected to supply enriched uranium fuel for the plant’s entire lifetime. Construction work for units 3 and 4 at Kudankulam began last October and they are expected to begin supplying power by 2022-2023. Agreement has also been reached for the construction of units 5 and 6. The construction of the Kudankulam NPP was initially agreed by the Soviet Union and India back in 1988, but the project was in frozen for some time. NPCIL and Russian state nuclear corporation Rosatom relaunched a much-delayed joint project to build the Kudankulam NPP in 2012.