Anticipating power shortages due to its closed quake-hit nuclear plant and a surge in air conditioner use during the current heat wave, Tokyo Electric Power Co. said Wednesday that it had resorted to emergency supply-adjustment measures for the first time in 17 years.

Tokyo Electric said it expects to save between 150,000 and 200,000 kw by reducing the power specifically to 23 large-lot industrial customers between 1 and 5 p.m.

Under the terms of its contracts with 1,250 large-lot customers, including factories and offices, Tepco can temporarily curb the power supply when it cannot meet demand.