The Mechanical Energy Storage Market was estimated at USD 12.18 billion in 2024 and is projected to grow from USD 13.15 billion in 2025 to USD 28.31 billion by 2035, exhibiting a compound annual growth rate of 7.97% during the forecast period. These systems store energy in physical form — through spinning flywheels, elevated water, compressed air, or gravity — and release it on demand, providing the flexibility that intermittent renewable generation requires. Growth is anchored in renewable energy integration, grid stability requirements, and supportive regulatory frameworks.
Report Key Statistics
Historical data spans 2019 through 2024, with 2024 as the base year. The report segments the market by technology, application, end use, storage capacity, and region.
Technology segmentation shows flywheel energy storage holding a prominent position, reflecting its established technology and efficiency for rapid energy delivery, valued at USD 1.22 billion in 2024 and expected to increase to USD 3.0 billion by 2035, distinguished by ability to deliver energy quickly and efficiently, making it particularly suited for applications requiring rapid response times, with dominance attributed to high cycle life and minimal maintenance needs. Pump hydro storage, projected to grow from USD 4.0 billion to USD 10.0 billion by 2035, is rapidly gaining traction as a more sustainable and flexible solution, witnessing significant interest due to potential for expansive scale and role in balancing renewable energy sources. Compressed air energy storage is expected to grow from USD 2.0 billion to USD 5.0 billion by 2035. Gravitational and thermal energy storage complete the distribution.
Application segmentation shows grid energy storage holding the largest share, projected to grow from USD 3.0 billion to USD 7.0 billion by 2035. Renewable energy integration stands out as a dominant application, driven by global initiatives aimed at increasing reliance on renewable sources and focusing on integration of energy storage systems with solar and wind power to stabilize supply and demand dynamics. Peak shaving is rapidly emerging due to rising concerns over electricity costs during peak demand periods. Uninterrupted power supply is an emerging application, rapidly advancing to meet increasing demand for reliable power solutions in sectors including healthcare and IT.
End-use segmentation shows utilities dominating with considerable share, with demand surging due to increasing need for grid stability, renewable energy integration, and demand response initiatives, making this segment integral to overall market dynamics. Commercial applications are rapidly gaining traction as businesses seek to optimize energy consumption and reduce costs, positioning the Commercial sector as the fastest-growing segment.
Storage capacity segmentation shows below 5 MW claiming a substantial portion of market share, appealing predominantly to smaller-scale applications particularly in residential and small commercial settings, and projected to grow from USD 3.0 billion to USD 7.0 billion by 2035. Above 20 MW is capturing attention due to increasing adoption in large-scale energy projects, reflecting a broader push towards renewable energy integration and energy security, and experiencing rapid growth driven by significant investments in renewable energy infrastructure, supportive government policies, and declining costs of energy storage technologies.
Industry Trends
Technological advancement is the first trend, with recent innovations enhancing efficiency and performance, and developments in materials and design likely to improve energy density and lifespan of storage systems, making them more attractive for various applications. Decentralization of energy systems forms the second trend, with smaller mechanical storage systems becoming more feasible, and this shift may empower local communities to manage energy needs more effectively, fostering resilience and independence.
Regulatory support and incentives is the third trend, with government policies and incentives aimed at promoting renewable energy adoption likely to bolster the market, and supportive regulations may encourage investments in storage technologies, facilitating their integration into energy systems.
Challenges
The report notes that as the world transitions toward cleaner energy sources, the integration of these systems into existing energy infrastructures is likely to enhance overall efficiency and reliability, and that the potential for these systems to provide localized energy resilience is noteworthy as they can help mitigate the impacts of grid outages and enhance energy security. Space constraints in urban areas favour smaller-scale solutions.
Future Outlook
Supportive regulatory frameworks drive growth, with governments increasingly recognizing the role of energy storage in achieving sustainability goals and enhancing grid reliability, and incentives such as tax credits, grants, and favorable policies being implemented to stimulate market growth, with certain regions having established mandates for energy storage deployment. Rising demand for renewable energy supports expansion, with the share of renewables in the energy mix projected to reach 50% by 2030, necessitating robust storage solutions.
Increasing energy security concerns influence growth, with geopolitical tensions and climate-related events threatening energy supply chains and countries seeking to enhance energy independence, and mechanical energy storage systems offering a reliable means to store excess energy generated during low-demand periods. Growing electrification of transportation reshapes the market, with the number of electric vehicles on the road projected to reach 300 million by 2030, necessitating robust energy storage solutions to support charging infrastructure. Advancements in energy storage technologies drive adoption, with improvements in flywheel technology enhancing energy density and cycle life, and development of hybrid systems combining different storage technologies gaining traction.
New opportunities lie in development of advanced flywheel energy storage systems for commercial applications, investment in hybrid mechanical storage solutions to enhance efficiency, and partnerships with renewable energy firms for integrated storage solutions.
Expert Discussion
Energy Vault has established a strong foothold through innovative approach to energy storage solutions, with unique technology utilizing gravity and kinetic energy providing a sustainable and efficient method for storing renewable energy, and focus on utilizing abundant materials and local resources reducing costs while emphasizing environmental sustainability, with proactive establishment of partnerships with key stakeholders to drive deployment and integration globally. S and C Electric Company plays a crucial role by delivering advanced technologies and solutions aimed at optimizing power delivery and storage efficiency, focusing on providing innovative energy storage systems that enhance grid stability and reliability, and leveraging extensive experience in electrical equipment and systems to create tailored solutions, with strong emphasis on research and development supporting ongoing advancements.
Recent developments include GE Vernova securing in May 2026 an order from Megha Engineering & Infrastructures for nine 150 MW pumped-storage units at India's 1.35 GW Upper Sileru hydropower plant, expected to be completed by 2030 and providing long-duration storage to balance growing solar and wind capacity. Energy Vault signed in May 2026 a strategic development agreement with South Africa's Eskom to deploy its EVx 2.0 gravity energy storage system at the Hendrina power station, starting with a 25 MW / 100 MWh system scalable up to 4 GWh across SADC countries by 2035, using coal ash as the storage medium. Siemens Energy detailed in August 2026 its Compressed Air Energy Storage solutions, distinguishing adiabatic CAES with thermal energy capture for higher efficiency from diabatic CAES, positioning CAES as a large-scale mechanical storage option for grid flexibility. Siemens Energy posted in May 2026 a master thesis project exploring high-temperature thermal energy storage integrated with a combined cycle CHP plant, investigating how thermal storage can provide long-duration energy storage by sharing the re-electrification systems of existing power plants.
Conclusion
The sector shows steady growth fundamentals. Current momentum rests on flywheel dominance and grid energy storage leadership. Emerging opportunities lie in advanced flywheel systems, hybrid storage solutions, and renewable partnerships. Technological developments in materials and design are steadily improving energy density. The long-term outlook anticipates the Mechanical Energy Storage Market reaching USD 28.31 billion by 2035, supported by renewable integration, grid stability, and energy security worldwide.
