The State Grid Corporation of China has started construction of an ultra-high voltage alternating current project in southwest China, Science and Technology Daily reported on Sunday.

This 1,000 kilovolt power project covers four substations in Sichuan Province and Chongqing Municipality, the report noted, adding that the transformation capacity will reach 24 million kilovolt-amperes.

The project is anticipated to be operational by summer 2025, and it will elevate the maximum altitude of the ultra-high voltage transmission to more than 4,700 meters upon completion.

It will allow the transmission of more than 35 billion kilowatt-hours of clean electricity annually and will play a significant role in building a clean, low-carbon, safe and efficient energy system.

Electricity demand is predicted to grow rapidly in Sichuan and Chongqing. It is estimated that in 2025, the maximum load of the two regions will exceed 89 million kilowatts (kW) and 35.5 million kW, respectively, increasing by 10.5 and 44.31 percent compared with 2020, according to the country's National Energy Administration.