So far, the installed capacity of renewable energy in Datong has reached 6.9 million kilowatts, accounting for half the total installed capacity of the city's power grid.

"The importance of coal-generated electricity for Germany's energy supply has continued to grow," Destatis said.

"Australia will continue to be a trusted and stable supplier of energy and resources to our key trading partners," he said.

Australian prime minister Anthony Albanese said the country will maintain its commitment to supply LNG and thermal coal to customers.

August thermal and metallurgical coal exports from Australia's 102mn t/yr Gladstone port continued to fall.

State-owned China Energy Investment Corp is ramping up efforts to dispatch coal from production hubs such as Shaanxi and Gansu provinces to Sichuan province and Chongqing.

The upgrades, targeted to promote clean production and improve efficiency, have brought about both environmental and economic benefits.

The industry has also stepped up efforts ensuring safe mining in recent years, Sun said.