sentences:  In October 2018 Leningrad II-1 started commercial operation, and Leningrad II-2 is scheduled for start of commercial operation during 2020.Leningrad II-3 and II-4 are planned but construction has not started.In December 2019 Leningrad II-1 was integrated into the district heating system of Sosnovy Bor and the local industrial park, replacing the heating capacity of the closed RBMK-1000 units.