Japan on Tuesday issued an emergency plea for citizens, businesses and local authorities to conserve energy, warning of potential blackouts after a massive earthquake idled several power plants and unseasonably cold weather boosted demand.
As snow fell in Tokyo and the temperature dropped sharply to four degrees Celsius (39 Fahrenheit), Tokyo Electric Power Co (9501.T) said 2-3 million households could lose power after 8 p.m. (1100 GMT) at the current power usage rate.
"At this rate, we are coming closer to a state where we will have to conduct power outages similar to those that took place after the quake (last week)," said Minister of Economy, Trade and Industry (METI) Koichi Hagiuda.
At a hastily called news conference, Hagiuda called for an additional 5% or so of power savings every hour from 3 to 8 p.m., equivalent to about 2 million kilowatts per hour.
Electronics retailer Bic Camera (3048.T) said it had turned off about half of the TV sets at more than 30 of its stores in eastern Japan.
The magnitude 7.4 tremor last Wednesday off the northeastern coast - the same region devastated by an earthquake and tsunami in 2011 - temporarily cut power to about 2 million households, including hundreds of thousands in the capital, Tokyo.
Chief Cabinet Secretary Hirokazu Matsuno earlier called on residents in eastern Japan impacted by the power crisis to save energy.
"We request your cooperation ... such as by setting your thermostats at around 20 degrees Celsius (68 Fahrenheit) and switching off any unnecessary lights," Matsuno told a news conference.
He added that the request to save energy was unlikely to extend beyond Tuesday given the expected rise in temperatures and the addition of more solar power generation as the weather improves.
"I use the heater a lot so I will try to do my part to save energy," 22-year-old college student Shuntaro Ishinabe told Reuters.
Last week's earthquake left six thermal plants un-operational in Tepco and Tohoku Electric Power Co's (9506.T) coverage areas, and the damage to equipment could keep some idle for weeks or months, Hagiuda said.
Tepco said 100% of power generation capacity was forecast to be used to meet peak demand in its service area between 4-5 p.m. It had requested seven regional utilities to provide an electricity supply of up to 1.42 million kilowatts to ease the crunch.
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