China's power supply has remained stable through the peak summer period with no demand-response measures triggered, as the grid faces surging demand amid sustained temperatures and rising economic activity, the National Energy Administration (NEA) said lately.

The country's power load set new records three times since early July, peaking at 1.55 TW on July 14, up about 45 GW from last year's high, Liu Mingyang, deputy head of the NEA's power department, told a press briefing on the same day.

Since June, power grids in eastern, central and northeast China set load records seven times, while 15 provincial grids including Liaoning, Jiangsu, Hubei and Sichuan logged 32 record highs cumulatively.

The load increase came as a large-scale subtropical high-pressure system brought prolonged high temperatures to much of the country, coinciding with the end of the plum rain season in southern regions. Strong economic activity added to the demand pressure.

Despite the surge in demand, power supply conditions have remained broadly stable nationwide, the NEA said.

China added about 400 GW of new power generation capacity in June compared with the same month last year, including 110 GW of supporting and regulating capacity from hydropower, gas-fired and coal-fired plants.

The new Shanxi-Anhui ultra-high-voltage direct current transmission project also came online, bringing the number of operational UHV lines to 46 with total west-to-east power transmission capacity exceeding 340 GW.

Coal and natural gas supplies have been sufficient this summer, with coal inventories at grid-dispatched power plants sufficient for more than 30 days of consumption, a historically sound level.

The administration said it had handled emergencies including typhoon damage and shipping lane disruptions, ensuring stable power supply to Guangdong, Hainan and Zhejiang.

Looking ahead, if widespread sustained high temperatures persist, peak national power load could reach around 1.6 TW, up 90 GW from last year, with overall supply-demand balance expected to hold.

Provinces including Guangdong, Anhui, Henan, Sichuan and Chongqing have implemented tailored supply measures to manage periods of tight supply, the administration said.