Thai League 1 side Port were yesterday slapped with a 2-0 loss to Police Tero for a power outage during Sunday's match at their PAT Stadium.
The decision was made by the Football Assocation of Thailand (FAT) disciplinary committee following a meeting with officials from Port and the Metropolitan Electrictiy Authority (MEA).
Port were also fined 50,000 baht and their representatives at the meeting accepted the ruling.
Port chairwoman Nualphan Lamsam earlier apologised for the incident and said the team would accept any punishment.
Big-spending Port were level 1-1 against Police Tero with two minutes to go when a power failure halted the game on Sunday night.
After more than one hour, the match was called off.
One of the Thai league rules states that if a power outage lasts more than one hour, the home team will be punished with a 2-0 defeat.
Port representative Witoon Chomchaipol told yesterday's meeting that after the incident the club checked all aspects for eight hours and concluded that the main circuit breaker went out of order.
Ahead of yesterday's meeting, the MEA sent a letter to the FAT saying that the problem occurred due to Port's fault and denied any responsibility.
Amnuay Nimmano, chairman of the FAT disciplinary committee, told reporters that Port were at fault.
"They failed to keep their equipment in good condition," Amnuay said.
"As they could not solve the problem in 60 minutes, they were handed a 2-0 loss as stipulated by the rules."
The punishment could prove costly for Port in their bid to win the Thai League 1 title. With the decision, Port dropped to fourth place with 10 points from five games, while Police Tero moved up to third with 12 points.
Leading duo True Bangkok United and Ratchaburi have 12 points from four games.
Port face another tricky assignment this weekend when they host BG Pathum, who have 10 points from four matches.
The season was suspended in March after four rounds of matches due to the Covid-19 pandemic and resumed on Saturday.
However, some matches at the weekend were postponed after Buriram United midfielder Buriram United midfielder Akbar Ismatullaev tested positive for the coronavirus.
The Uzbek player has since tested negative, according to his club.