Last summer was the joint hottest on record in Japan as extreme heatwaves fuelled by climate change engulfed many parts of the globe.

"The basic fee will be waived for four months," Tokyo Governor Yuriko Koike told reporters Tuesday, adding that households would save an average of 5,000 yen ($35).

The government aims to reduce the inflation burden on households, and encourage the use of air conditioning to prevent heatstroke.

"We hope to create an environment where Tokyo residents can live safely even in the expected heatwaves," Koike said.

Every summer, Japanese officials urge the public, especially elderly people, to seek shelter in air-conditioned rooms to avoid heatstroke.

Senior citizens made up more than 80 percent of heat-related deaths in the past five years.

Pensioners are harder hit by rising electricity bills, and some elderly Japanese believe that air conditioning is bad for health.

The Tokyo government has budgeted 36.8 billion yen to cover around 8 million households -- or a population of 14 million.

Water costs above the basic fees will be charged as usual.