The 1,400MW plant is being developed by Ratchaburi Power Company (RPCL) in which Chubu Electric Power and Toyota Tsusho are equity holders.
The loan is co-financed with Sumitomo Mitsui, Calyon, HSBC, Bangkok Bank and Krung Thai Bank.
The combined-cycle gas turbine power plant in Ratchaburi province, some 150km west of Bangkok will sell electricity to Egat under a 25-year contract.
Demand for power is growing fast in Thailand, registering an average of 7% growth over the past decade, and according to the Thai Ministry of Energy is projected to continue rising, with peak demand in 2015 forecast at 40,978MW – twice the size it was in 2004.