He said many network-related infrastructure items will be transferred to state ownership after concessions expire, such as mass-transit trains and expressways. "This concession model is called the build-operate-transfer concession, which will operate for roughly 20-25 years before ownership transfer begins," Mr Kulit said. The ministry will soon respond to the Office of the Ombudsman. If the office is still unsatisfied with Egat's ownership structure, it can send a legal petition to the Constitutional Court for a final ruling. The ombudsman's latest move is seen as maintaining state benefits in power generation after the capture of the sector by private producers. As recently as 2005, Egat was responsible for 55% of the country's power generation. POWER PRIVATISATION Egat held a monopoly in Thailand's power generation until GDP expanded exuberantly from the late 1980s to the early 1990s.