In October 2006, a preliminary agreement for two further 1060 MWe AES-91 reactors as the second construction phase at Tianwan in Lianyungang city of Jiangsu province was signed with Russia's Atomstroyexport. Construction of units 3 & 4 was to start when both the first two units were commissioned, and hence in November 2007 a further agreement was signed by CNNC.
Preliminary approval from NDRC was received in August 2009. Construction is expected to start in October 2010, and the project is expected to cost $3.8 billion. However, in September 2009 it was reported that negotiations on the price were delaying signing of the construction contract with Jiangsu Nuclear Power Corporation and that Atomstroyexport would not act as the principal contractor, though it insists on retaining intellectual property rights. However, in October agreement was reached on fixing a price ceiling for the plant.
In August 2009 the Assets Supervision & Administration Commission announced that Phase 3 of Tianwan (units 5 & 6) would start construction in October 2010. These are likely to be AES-2006 type.