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Koh Samui Power: New Submarine Cable Contract Signed
· Luxy Samui
PEA signed a THB1.81 billion contract in July 2026 for a 115 kV submarine cable to reinforce Koh Samui's electricity supply.
Work to strengthen Koh Samui's electricity supply has moved forward. Kaohoon International reported on 7 July 2026 that the Provincial Electricity Authority (PEA) had signed a contract worth THB1,813,300,000 with the Interlink Consortium for a 115 kV submarine cable. The stated purpose is to replace and increase power supply capacity to Koh Samui. The contract is dated 6 July 2026 and the work is due to be delivered within 540 days.
What the contract covers
The consortium is made up of three companies in the same group: Interlink Communication (ILINK), Interlink Telecom (ITEL) and Interlink Power and Engineering (IPOWER). The report gives the voltage of the cable, the contract value and the delivery period. It does not give the route or the capacity in megawatts.
A delivery period of 540 days is roughly 18 months. Counted from the contract date, that points to the end of 2027 or early 2028. This is the contractual period reported by the source, not a confirmed completion date.
Why Samui needs more capacity
Electricity reaches Koh Samui from the mainland through cables on the seabed. In February 2025, The Nation reported that four submarine circuits were in service, at 115 kV and 33 kV, and that PEA described them as ageing and not sufficient. The same report said the island had suffered three recent blackouts and that demand was expected to reach 200 megawatts in 2025.
As a temporary measure, PEA borrowed five mobile generators from the Electricity Generating Authority of Thailand to add about 10 megawatts.
The larger 230 kV plan
The Nation's report also described a much larger project: a 230 kV undersea cable from the Khanom power station in Nakhon Si Thammarat, able to carry 200 megawatts, at a cost of 11.23 billion baht. Under the timetable given at that time, the first circuit was planned for June 2028 and the second for June 2029.
The sources we read do not explain how the 115 kV contract signed in July 2026 relates to that larger plan, and we have not found a newer official timetable for the 230 kV link. Readers should treat the 2028 and 2029 dates as the plan announced in early 2025.
What it means for villa owners
More cable capacity should make island-wide outages less likely once the work is finished, but that is still some time away. Until then, owners should plan for short cuts and voltage changes, especially in peak season when air conditioning use is highest.
- Protect pool pumps, air conditioners and electronics with surge protection.
- For larger villas, consider a backup generator or battery system and test it regularly.
- Tell guests clearly how to reach someone if the power goes off.
A dependable supply is also part of what guests compare when they choose between villas for rent in Koh Samui, so a short power cut handled well matters for reviews as much as for comfort.
