Renewable Energy Storage: Salt Caverns as Effective Solution for Intermittent Power Supply

Researchers from Wuhan University have proposed salt caverns as a potential solution for storing renewable energy on a massive scale. The advance of energy technology has led to an increase in the contribution from renewable sources, but their intermittency and instability pose significant challenges to widespread deployment. According to the study, salt caverns can be used to construct supercapacitors and supercapatteries with a giga- to tera-watt-hour scale, mitigating the need for load levelling and power supply security.

Key Takeaways:

• The advancement of energy technology has led to a notable increase in the contribution from renewable energy sources, but their intermittency and instability present significant challenges to widespread deployment.
• Salt caverns, which offer a sealable and unmatched large space, are proposed for construction of giga- to tera-watt-hour scale supercapacitors and supercapatteries as an effective storage solution for renewable energy farms and national and international power grids.
• The potential for construction of supercapacitors and supercapatteries in salt caverns is explored, with special focus on aqueous electrolytes formed using the salty water or brine from the construction of the salt cavern and suitable electrode materials.
• Calculations and analyses are given on the prospects of construction and application of giga- to tera-watt-hour supercapacitors and supercapatteries in salt caverns.
• Foreseeable challenges of ultra-large scale electrochemical energy storage devices are discussed, along with possible solutions.
• The research proposes salt caverns as a viable solution for large-scale energy storage, ensuring power supply security and load levelling.

Statistics:

• The study aims to construct supercapacitors and supercapatteries with a giga- to tera-watt-hour scale, providing sufficient storage capacity for national and international power grids.
• Salt caverns offer a unmatched large space, exceeding the capacity of other storage facilities.
• The salty water or brine from the construction of the salt cavern can be used to form aqueous electrolytes, reducing the need for additional resources.
• The proposed supercapacitors and supercapatteries can mitigate the need for load levelling and power supply security, ensuring a stable and continuous power supply.

Sources:

• NewsRx. Studies from Wuhan University Yield New Data on Renewable Energy (Gigawatt-hour To Terawatt-hour Salt Cavern Supercapacitors and Supercapatteries). Ecology, Environment & Conservation. July 11, 2025; p 1197.
• Chemical Communications, 2025.