pumped

In December 2020, Xi Jinping, the president of China, announced that the country he leads would reach 1,200 GW of installed wind and solar capacity by 2030. He was wrong. China reached this figure in July 2024and, therefore, no less than six years before the deadline set by the Government. At the end of 2025, the accumulated capacity of these two energy sources exceeded 1,840 GW, making them those responsible for 47.3% of China’s electrical capacity. That was the first time wind and solar energy They surpassed coal and gas in the Chinese electricity mix. However, the rapid expansion of these renewable energy sources has placed China in a scenario in which it is crucial to find a way to integrate them efficiently into the country’s energy system. Wind and solar energy have an intermittent nature, so it is essential to develop large-scale storage infrastructure and a network that is capable of managing the peaks and valleys of supply in an automated way. Pumping is the most efficient way to store energy on a large scale To solve this challenge, China has launched a strategy that proposes transforming energy storage into a national priority. One of the solutions it is deploying is installing large battery systems at a record pace. In 2025 its battery storage capacity grew by 75% compared to 2024. However, in this area its biggest bet is pumped hydroelectric storage. At the moment China has more pumping projects underway than all the other countries in the world combined. Their plan is to use excess solar and wind energy to pump water into elevated reservoirs and release it when electricity is needed. Pumped hydroelectric plants fit very well in mountainous countries because they allow you to take advantage of uneven terrain to move large masses of water between two reservoirs or deposits at different heights. China currently has more pumping projects underway than all other countries in the world combined. The excess energy can be used to pump water from the lower reservoir to the upper one using a hydraulic pump, and to recover that energy it is only necessary to let it fall back into the lower reservoir from the upper one so that it drives a hydraulic turbine. Pumped hydroelectricity has been used for more than a century, but it remains a very attractive technology. In fact, it is currently one of the energy storage systems more efficient large scale. The largest facility of its kind in Europe it is the pumped hydroelectric plant of the Cortes–La Muela complex (La Muela I + La Muela II), on the Júcar river (Valencia). If we stick to pumped hydro storage, China aims to add about 100 GW in five years compared to the current 59 GW. If it achieves its purpose, this technology will become the basis of its long-term storage system in this country. Still, the Government has also committed to more rapidly expanding battery storage. At the end of 2025 the accumulated capacity reached 136 GWwhich multiplies by 40 the level proposed by the previous five-year plan. Lithium-ion batteries clearly dominate this market, but China is investigating alternative technologiessuch as sodium-ion batteries, compressed air batteries, flywheels or gravitational storage. Image | Generated by Xataka with Gemini More information | Volt Insight Xataka | China dominates the world of renewable energy, but it has an Achilles heel: it depends on the West more than it admits