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![Fans for air conditioners are installed outside a building in Namdaemun, central Seoul, on Thursday. Power reserves dropped to this year's lowest due to the rising electricity demand driven by the heat wave. The electricity power reserve ratio, which indicates how much electricity can be supplied compared to the demand, fell to 12.2 percent Tuesday, according to Korea Power Exchange's data released Thursday.[YONHAP]](https://image.koreajoongangdaily.com/10661746.jpg?imageId=10661746&width=240&height=184&format=webp&format=jpg)