"In line with its pathway to net-zero, Japan will end new construction of domestic unabated coal power plants, while securing a stable energy supply," Kishida said.
The pledge comes as energy-scarce Japan grapples with balancing its carbon emission reduction target of 46% by 2030 from 2013 levels with its increased reliance on fossil fuels after suspending many of its nuclear power plants following the Fukushima nuclear disaster.
The pledge is in line with the commitments of the Group of Seven (G7) developed nations - chaired by Japan this year - to put a stop to unabated coal-fired power generation projects as soon as possible.
Fossil fuels accounted for 71% of Japan's electricity in 2022, and total emissions have increased by 19% in the past 20 years, according to a report from think tank Ember.
A Japanese foreign ministry official said the pledge will not apply to coal power plants that are currently under construction, as they are being build in line with pre-existing plans. Japan will also try to decrease its reliance on currently operational coal plants, he said, without elaborating further.
The official, who declined to be named, said Japan may build abated coal power plants should the technology emerge.
About 25% of Japan's electricity was generated by nuclear power in 2010, a year before a giant earthquake and tsunami caused a triple-core meltdown at the Fukushima nuclear power plant and initially displaced some 470,000 people.
Japan has since taken many of its nuclear power plants offline amid public concerns over nuclear safety and has dialled up its reliance on fossil fuels, mainly from coal and natural gas. Japan now gets about 5% of its energy from nuclear power.
In 2022, Japan was more reliant on fossil fuels than the United States at 60% and China at 64%, though it was behind India, which relied on coal and gas to generate some 77% of its electricity, the Ember report said.
Japan's top utility JERA wants to reduce emissions from its existing coal-fired power plants by adding ammonia to co-firing - a process it has begun at one of the plants in 2021 and which is to be expanded around next March.
