South Korea's state-run electricity distributor issued a power shortage alert Tuesday due to a surge in electricity consumption caused by high temperatures, the second such move in as many days.
The Korea Power Exchange issued an initial warning at 11:20 a.m. after the country's electricity reserve dropped to below 4 million kilowatts.
The company later upgraded the warning to its third-highest level of "attention," which is triggered when the reserve level drops to between 2 million and 3 million kilowatts. The second-highest warning of "caution" is issued when the reserve falls to less than 2 million kilowatts.
If the electricity reserve runs out, it may cause a nationwide blackout, which could take weeks or months to repair, according to the Ministry of Knowledge Economy that handles the country's energy affairs.