Japan gave the money to help its companies build three such plants in Indonesia and listed it with the United Nations as climate finance, The Associated Press has found.
Japan says these plants burn coal more efficiently and are therefore cleaner than old coal plants.
However, they still emit twice as much heat-trapping carbon dioxide as plants running on natural gas. Villagers near the Cirebon plant in Indonesia also complain that stocks of shrimp, fish and green mussels have dwindled.
Japan, a top contributor of climate finance, denies any wrongdoing and has done nothing illegal, there are no rules against counting such projects as climate finance in the UN system.
"There are countries ... That cannot afford to have other methods than coal," Japanese Foreign Ministry spokeswoman Takako Ito said. "For these countries, we'd like to provide the best method of reducing carbon dioxide."
"Unabated coal has no room in the future energy system," she told AP. "Over time, what we should be seeing is a very, very clear trend of investment into clean renewable energy."
Even the newly launched Green Climate Fund, a key channel for climate finance in the future, still only has vague guidelines on how to spend the money.
Board member Jan Cedergren said he didn't believe the fund would support fossil fuels but acknowledged no decision has so far been made.
An analysis of the 300 top climate finance projects during that period showed Japan was the only country to include direct support to new coal plants.
Japan's climate finance also included a USD 15 million development loan for a plant in Indramayu, West Java, and a dozen smaller coal projects in India, Indonesia and Vietnam.
Those were identified as coal projects in documents submitted to the UN, while the larger projects in Paiton and Cirebon were not.
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