Castle peak ‘A’ Power Station comprises four 350-MW generators and four 50-MW gas turbine units, switchgear houses, control and administration blocks and ancillary buildings for which Kumagai constructed the services, roads, cooling water culverts, building and architectural works and all associated works.  Site formation started in late 1978 and the first 350-MW unit was commissioned and put into service in March 1982.  The fourth unit went on-stream at the end of 1984.

Castle Peak ‘B’ Power Station comprises four 660-MW generators and other buildings and features similar to those in the ‘A’ Station but on a larger scale for which Kumagai carried out the same works they performed for the ‘A’ Station together with the supply and erection of the structural steelwork (some 50,000 tonnes). Work commenced in May 1982 and the first unit went on-stream in December 1985.