Water lines on the banks of Lake Oroville in Butte County have depleted so rapidly that the reservoir’s hydroelectric power plant may have to shut down for the first time ever, straining an already encumbered power grid during the hottest part of the summer, California officials announced Thursday.

Since 1967, the Edward Hyatt Power Plant has been a crucial source of electricity for the area and usually has the capacity to power up to 800,000 homes, pumping water from the lake through its underground facilities, according to CNN. However, water levels are currently approaching 700 feet, exacerbated by a severe drought and triple-digit temperatures.