(Repeats from SEPT 20, no changes to text)

By John Kemp

LONDON, Sept 20 (Reuters) - China's coal production has surged this year as the government seeks to improve energy security by reducing dependence on imports and amassing inventories at power plants.

Raising domestic coal output is consistent with Beijing's broader effort to indigenise supplies of critical energy sources, raw materials and technology.

Production hit a record 2,929 million tonnes in the first eight months of 2022, according to China’s National Bureau of Statistics (“Monthly output of energy products”, NBS, Sept. 16).

Mine output was up by 332 million tonnes (13%) compared with the same period in 2021 and 520 million tonnes (22%) compared with the last pre-pandemic year in 2019.

Production has been growing faster than coal-fired electricity generation as the government tries to increase fuel stocks and cut reliance on imports (https://tmsnrt.rs/3qQFZPd).

Thermal power generation, nearly all from coal, set a new record of 3,883 billion kilowatt-hours (kWh) in the first eight months of the year.

But thermal generation was up by just 10 billion kWh (0.3%) compared with 2021 and 497 billion kWh (15%) compared with 2019.

Big increases from wind farms, solar farms and, until this summer’s drought, from hydro-electric power plants have also reduced the need to burn more coal.

As a result, coal-fired generators’ share of total electricity production fell to 69% in the first eight months of 2022 from 72% in both 2021 and 2019.

This has meant an improvement in coal stocks held by power producers after they became dangerously depleted last year.

Imports of coal and lignite have also fallen to 168 million tonnes in the first eight months of 2022, from 198 million tonnes in 2022 and 220 million tonnes in 2019.

Some of the reduction is down to disruption caused by repeated lockdowns to control the coronavirus epidemic which has hit iron and steel production.

Coal imports include both high-grade coking coal for blast furnaces as well as lower-grade coal for use in power plants.

But the massive expansion in domestic output has enabled China to raise generation and rebuild stocks without having to source more fuel from exporters.

DROUGHT THREAT

Since the end of June, however, the severe drought that has hit the Yangtze basin has reversed some of these favourable trends and revived concerns about fuel security.

Low levels of hydro generation forced China to rely more heavily on coal-fired units and draw more heavily on coal supplies since the start of July.

If the drought persists, electricity supplies are likely to be especially tight during the winter peak, when hydro and solar output will be lower while heating and lighting loads will increase significantly.