China has significantly accelerated its development of wind and solar energy, achieving the impressive milestone of 1,200 GW of installed capacity by mid-2024, well ahead of the 2030 target initially set by President Xi Jinping. By the end of 2025, the cumulative capacity of these renewable energy sources surpassed 1,840 GW, contributing to a remarkable 47.3% of China’s overall electrical capacity. This achievement marks a pivotal moment as wind and solar energy now outpace coal and gas within the nation’s energy mix.
The Need for Energy Storage Solutions
Despite these substantial achievements, the integration of renewable energy into China’s power grid presents unique challenges. The intermittent nature of solar and wind energy necessitates efficient energy storage systems to manage fluctuations in supply. With the rapid expansion of renewables, the country is prioritizing the development of large-scale energy storage infrastructure capable of handling variable energy flows.
Pumped Hydroelectric Storage: A Smart Solution
China’s primary strategy to address these challenges centers on pumped hydroelectric storage (PHS). This technology is pivotal for large-scale energy storage, allowing the country to leverage its geographic advantages. Pumped hydro systems use surplus renewable energy to pump water into higher elevation reservoirs. When energy demand peaks, the stored water can be released back down to generate electricity efficiently.
Currently, China is undertaking more pumped hydro projects than all other nations combined. The potential for these systems is significant, especially in China’s mountainous regions, where uneven terrain can be exploited for maximum efficiency. Utilizing excess energy, water is pumped to an elevated reservoir and released during demand surges, providing a reliable energy source when needed.
Highly Efficient and Enduring Technology
Pumped hydro has been a cornerstone of energy storage for over a century, remaining one of the most efficient large-scale storage solutions available. Notably, the largest pumped hydro plant in Europe is the Cortes–La Muela complex located on the Júcar River in Valencia, Spain, exemplifying the technology’s enduring appeal.
Future Ambitions: Expanding Capacity
China is setting ambitious goals for its pumped hydro storage capacity, targeting an increase of over 100 GW in the next five years, elevating its current capacity from 59 GW. This enhanced capacity aims to form the backbone of China’s long-term energy storage strategy. Furthermore, the government is concurrently pushing for rapid advancements in battery storage technologies.
By the end of 2025, the accumulated battery storage capacity is anticipated to reach around 136 GW, marking a forty-fold increase from previous plans. While lithium-ion batteries currently dominate this sector, China is actively exploring alternative storage solutions, including sodium-ion batteries, compressed air systems, flywheels, and gravitational storage technologies.
Conclusion: A Leader in Renewable Energy
As China continues to break records in renewable energy expansion and paves the way for a sustainable energy future, its focus on developing robust energy storage solutions like pumped hydro demonstrates a proactive approach to balancing a growing energy mix. This transformation plans to solidify China’s position as a leading nation in overcoming the complexities of modern energy demands.