The $21 billion project, which received final investment approval in 2019, is expected to be launched in 2023 and to reach full capacity of almost 20 million tonnes per year in 2026.
Russia's Sberbank said in January it had approved financing of up to 3 billion euros ($3.5 billion) for the Arctic LNG 2.
Spending on greener products including wind, solar, geothermal and hydrogen power will expand "significantly year on year," Dai said, without giving detail.
He said the next five-to-10 years would be "the window for energy transitions" and the company was working on precise timelines.