Mitsubishi Heavy Industries Ltd. has begun work to build a fifth thermal power generator at the Tuxpan power plant in Mexico, the company said Thursday.

The No. 5 unit will be a gas-turbine combined-cycle power plant fired by liquefied natural gas with a generating capacity of 495 mw. It is scheduled to begin operation in September 2006.

The order was awarded to MHI by a joint venture established in Mexico by Japanese companies Mitsubishi Corp. and Kyushu Electric Power Co.

The electricity generated at the plant will be entirely sold to the Federal Commission of Electricity, a Mexican public corporation.

MHI built three of the four existing units at the Tuxpan power plant.