International competitive bids are invited for the construction of the 500 kV Surat Thani 2-Phuket 3 (from 116 km to Phuket 3) transmission line and the 500 kV Surat Thani 2 - Phuket 3 (Phuket channel crossing section) line under the Transmission System Improvement Project in Western and Southern Regions to Enhance System Security project.