A senior trade ministry official said that to increase the sales of the plants, which would cost around $3.1 billion apiece, funding from the state-owned Japan Bank for International Cooperation would help.

Futoshi Usui, a Tokyo-based analyst at Credit Suisse, said: “The government’s marketing campaign will be a big plus for Mitsubishi Heavy in the competition to capture the market for ‘green technology.”

Japan is planning to finance a clean-coal plant to be operated by ZeroGen, which is owned by Queensland state government, informed an official.

Hideo Ikuno, a Tokyo-based spokesman for Mitsubishi Heavy, said: “We would welcome the government’s backing if any and it’s aimed at boosting exports of Japan’s technologies.”

Ikuno also said that the Integrated Gasification Combined Cycle (IGCC) that turns coal into gas can tape and store 90% of carbon dioxide emitted from the coal-fired power stations.