Power Cuts on Koh Phangan: Why They Happen and What to Do

Power Cuts on Koh Phangan: How the Island Is Wired, and What to Do When the Lights Go Out

Nobody plans a holiday around the electricity supply. But if you are here long enough, the lights will go out at some point — usually for twenty minutes in the afternoon, occasionally for most of a day — and it is worth knowing in advance which parts of your life stop with them.

This is the short, practical version: where the power comes from, how bad it gets, what actually breaks, and the small amount of preparation that turns an outage into a non-event.

Where the electricity comes from

Koh Phangan does not generate most of its own power. Neither does Koh Samui, which has no power plant of its own. The supply arrives from the mainland — from the Khanom area in Nakhon Si Thammarat — through high-voltage cables laid under the sea, and the same supply chain feeds both islands.

That is a very efficient arrangement most of the time, and a single point of failure the rest. In 2012 a section of high-voltage cable failed and Samui and Phangan went dark for three days; tourists left the islands in numbers, petrol was shipped over to keep generators running at essential facilities, and the Provincial Electricity Authority issued a public apology. Years later a naval vessel's anchor damaged the 115 kV undersea cable and blacked out both islands again.

Those are the famous events, not the normal ones. They are worth knowing about because they explain why islanders treat a flicker at 2pm with more patience than you might.

The supply is being strengthened. EGAT is building two new 230 kV submarine circuits, around 50 km in total, from Khanom to a new substation on Samui, with construction starting in 2026, the first circuit due in 2028 and the second in 2029. The project includes real-time monitoring of the cables and fibre-optic fault location, so faults can be found quickly rather than hunted for. It is a Samui project on paper, but Phangan sits downstream of the same mainland link, so it matters here too.

In the meantime: expect the occasional cut, and do not expect the grid to become flawless before 2028.

What a cut on Phangan is actually like

Most outages are short and local — a substation or a line on one side of the island. Planned maintenance cuts happen too, usually in daylight hours and usually announced locally in Thai beforehand. If you are staying somewhere with a Thai host or manager, they will normally know before you do, so it is a reasonable thing to ask about at check-in.

What stops working, roughly in the order you notice it:

Water. This is the one that surprises people. Most properties here pump water from a tank or a well, and no power means no pump. Showers and toilets may run for a few minutes on whatever pressure is left, then stop. If a cut is announced, fill a bucket and a couple of bottles.
Wifi. Even if the fibre line is fine, the router and the box on the wall are not. Mobile data usually keeps working for a while, though it can slow down as everyone switches to it at once.
Fans and air conditioning. In March and April, an afternoon without a fan is the part you will feel. A hilltop with cross-breeze copes; a sealed room in Thong Sala does not.
Card machines and ATMs. Small places go cash-only or close. This is a good argument for keeping a few thousand baht in the room rather than relying on QR payments; there is more on that in our journal.
Fuel pumps. Petrol stations with electric pumps shut. The roadside bottle sellers do not, which is one of the few times they are worth the mark-up.

Traffic lights and street lighting are not much of an issue here — there are very few of either. Riding a scooter on unlit interior roads after dark during an outage is a different matter, and not a good idea.

Plugs, voltage and the things that break

Thailand runs on 220 V at 50 Hz. Sockets usually take flat pins (types A and B) and round two-pin European plugs (type C), often in the same hybrid socket. UK three-pin plugs will not fit and neither will Australian ones, so bring an adapter; most European and US chargers plug straight in. Check your charger says 100–240 V before you plug in anything from a 110 V country.

The real risk is not the everyday supply, it is the return. Power coming back after a cut, and lightning during a storm, are what kills routers, fridges and the occasional laptop charger. During a thunderstorm, unplugging a laptop rather than leaving it charging is a two-second habit worth having. Many longer-term residents run a surge protector on anything expensive.

Solar, batteries and what "off-grid" really means

A lot of the newer houses in the island's interior run solar with battery storage, and a growing number of hotels keep a generator. This is why two guests can have completely different experiences of the same outage: one loses the pump and the wifi, the other notices nothing until someone mentions it.

Ask specifically, because the words are used loosely. "Solar-powered" can mean anything from panels feeding the grid during the day to a full battery bank that carries the house overnight. The questions that matter are whether there is battery storage, whether the water pump is on it, and whether the internet router is.

Our own house is one of the solar ones — built on a granite hilltop above Maduawan with panels, batteries and harvested rainwater, partly for the environmental arithmetic and partly because the interior of the island is not the place to be dependent on a single line. When the grid goes down in Thong Sala, the practical consequence up here is usually that the ice takes longer to make.

The short list

Three things, and you can stop thinking about it:

A head torch or a decent phone torch, plus a charged power bank.
Enough cash for a day.
A five-litre water bottle in the kitchen, refilled whenever you pass a station.

None of this is a reason to hesitate about coming. Koh Phangan's electricity is far more reliable than its reputation suggests, and the worst outages of the last fifteen years are documented events rather than weekly ones. It is simply an island at the end of a cable, and it helps to travel like you know that.