A provincial capital in southwest China has dimmed outdoor advertisements, subway lighting and building signs to save energy, official announcements said, as the area battles a power crunch triggered by record-high temperatures.

The mercury has soared beyond 40 degrees Celsius (104 Fahrenheit) in Sichuan province this week, fuelling massive demand for air conditioning and drying up reservoirs in a region reliant on dams for most of its electricity.

Factories including a joint venture with Japanese car giant Toyota in provincial capital Chengdu have been forced to halt work, while millions in another city Dazhou grappled with rolling power cuts.

"Hot and muggy weather has caused the city's electricity supply for production and daily life to be pushed to its limit," Chengdu's urban management authorities said in a notice on social media Thursday.

Faced with a "most severe situation", the city -- home to over 20 million people -- ordered landscape illumination and outdoor advertising lights to be switched off in notices issued Tuesday, the statement said.

Building name signs will also be darkened.

The Chengdu metro said in a video on China's Twitter-like platform Weibo that it would also turn off advertisement lights and "optimise" the temperature in stations to save energy.

Photos circulating on Weibo showed dimmed lights on metro platforms, walkways and in malls, with commuters walking in partial darkness.

The searing heat is also drying up the critical Yangtze River, with water flow on its main trunk about 50 percent lower than the average over the last five years, state media outlet China News Service reported Thursday.

Sichuan's power woes could have ripple effects on the wider Chinese economy -- the province is a key supplier of energy generated by hydropower to eastern industrial powerhouses including Jiangsu and Zhejiang.

China is battling extreme weather on several fronts, with 23 people killed and eight still missing after a flash flood in the northwest of the country on Thursday sparked by torrential rains.

Weather authorities in the eastern Jiangsu province warned drivers of tyre puncture risks on Friday as the surface temperature of some roads was poised to hit 68 degrees Celsius.

The China Meteorological Administration earlier said the nation was going through its longest period of sustained high temperatures since records began in 1961.

Scientists say extreme weather across the world has become more frequent due to climate change and that urgent global cooperation is needed to slow an impending disaster.

The world's two largest greenhouse gas emitters are the United States and China.

But this month Beijing announced it was freezing its cooperation with Washington on global warming in protest at a visit by US House Speaker Nancy Pelosi to Taiwan.

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Five million in southwest China face power cuts in heatwave
Beijing (AFP) Aug 17, 2022
More than five million people in southwest China were facing rolling power cuts Wednesday as a heatwave creates an electricity supply crunch that has forced factories to stop work. Temperatures across Sichuan province have surpassed 40 degrees Celsius (104 Fahrenheit) in recent days, causing demand for air conditioning to spike. The region also relies heavily on dams to generate its electricity but the heat has caused reservoirs to dry up, exacerbating the energy shortage. A local power comp ... read more