China's power grid faces a formidable challenge each summer as soaring temperatures and humidity drive electricity demand to unprecedented heights. However, the 2026 summer peak has been met with greater confidence, thanks to a combination of innovative solutions and technological advancements. Here's a deep dive into how China's grid is powering through this demanding season, with a focus on long-distance power transmission, energy storage, and the role of renewable energy.
Long-Distance Power Transmission: The Hami-Chongqing Line
One of the key players in China's summer power strategy is the Hami-Chongqing transmission line, a 2,260-kilometer energy artery utilizing ultra-high-voltage (UHV) technology. This line, which came into operation in June 2025, is a game-changer for Chongqing, a megacity with a population of over 30 million, known for its scorching summers. The Hami-Chongqing line transmits electricity generated in Hami, Xinjiang, to Chongqing, with a significant 70% of the power coming from clean energy sources.
Shuai Hong, deputy chief engineer of the power dispatch and control center, emphasizes the line's importance: "This is our strongest source of confidence in coping with summer peak demand." The line can transmit up to 6 million kilowatts at peak, covering approximately one-fifth of Chongqing's maximum power load. UHV technology, with its high voltage levels, ensures minimal energy loss over long distances, making it ideal for China's energy landscape.
In the past, Chongqing's industrial producers and businesses had to scale back operations during peak summers due to power shortages. However, the Hami-Chongqing line has transformed this. Chongqing Wang Cheng Technology Co., Ltd., an automotive and machinery components manufacturer, now operates its 100+ smart production lines at full capacity without the need to frontload production or rush orders. This flexibility is a direct result of the reliable power supply from Xinjiang.
Balancing Supply and Demand: Energy Storage and Virtual Power Plants
Meeting the summer peak isn't just about bringing in more power; it's also about balancing supply and demand in real-time. Energy storage facilities have played a crucial role in this regard. In Shandong Province, for instance, energy storage facilities were utilized to provide backup power during peak demand. On August 3, a coordinated dispatch of 172 energy storage power stations across the province discharged simultaneously, peaking at 11.98 million kilowatts, equivalent to the grid power load of Jinan, the capital city of Shandong.
New-type energy storage facilities, with their rapid response and flexibility, are key to managing peak loads and smoothing renewable power generation fluctuations. They can absorb surplus renewable electricity during the day and discharge it during evening peak periods. As of July, Shandong had 14.41 million kilowatts of installed new-type energy storage capacity.
The Rise of Renewable Energy
Renewable energy is playing an increasingly vital role in powering China's national grid. By the end of 2025, renewable energy accounted for over 60% of China's total installed power generation capacity. A national plan for renewable energy development during the 15th Five-Year Plan period (2026-2030) aims to further strengthen this role. The 'solar-wind relay' in Beijing is a prime example, where solar power from Qinghai Province and wind power from Heilongjiang Province are combined to meet the city's daytime and nighttime demand.
Consumer Flexibility: Vehicle-to-Grid (V2G) Technology
China's grid is also turning to consumers for flexibility. Vehicle-to-grid (V2G) technology allows electric vehicles to soak up surplus power during off-peak hours and return it to the grid when demand rises. Wuhan, the capital city of Hubei Province, has been piloting a V2G pricing mechanism since July 1. Eligible electric vehicles and private charging piles can feed electricity back into the grid, earning owners additional income while helping to balance peak loads.
In conclusion, China's power grid is navigating the summer peak with a combination of long-distance power transmission, energy storage, and the integration of renewable energy. These measures not only ensure a stable power supply but also demonstrate a commitment to innovation and sustainability. As China continues to invest in these technologies, it sets an example for the world in managing the challenges of peak demand while transitioning to a cleaner energy future.
