Image source, Getty ImagesJapan's government has urged people in Tokyo and its surrounding area to use less electricity on Monday as the country faces a heat wave.
Demand for power is expected to be severe this afternoon according to the ministry.
People should switch off unneeded lights but still use air conditioning to stay cool.
As the temperature rises, officials have warned of a power crunch.
The ministry said in a statement on Sunday that the excess generating capacity for electricity was expected to fall to 3.7% in Tokyo and eight surrounding prefectures. The buffer is needed for stable power supply.
People were asked to turn off unnecessary lights for three hours in order to use air conditioning and hydration.
The ministry said the situation was unpredictable as temperatures climbed.
The reserve margin will fall below the minimum requirement if there is an increase in demand.
The power supply in Japan has been tight since an earthquake in the northeastern part of the country in March.
Fossil fuel plants have been closed in an effort to cut carbon dioxide emissions.
There has been a surge in demand for electricity.
The Japanese government called on households and companies to save electricity during the summer months.
The city of Isesaki, which is 85 kilometres northwest of Tokyo, had the hottest June on record.
NHK reported that 46 people had been taken to hospital for suspected heatstroke in Tokyo.
The 94-year-old man is thought to have died from the condition.
In the face of an energy crisis, Australian officials urged households in New South Wales to turn off their lights. There were restrictions on the Australian wholesale energy market.
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