Global Energy Storage News – August 2026
August 2026 brought another active month for the global energy storage sector, with large-scale projects entering operation, manufacturing capacity expanding, and investment reaching new markets. As renewable generation grows, Energy Storage Systems (ESS) are playing a greater role in balancing electricity networks, improving grid flexibility, and integrating variable solar and wind power.
The industry is also moving beyond conventional lithium-ion battery solutions. Grid-forming batteries, sodium-ion chemistry, compressed-air systems, and emerging long-duration technologies are broadening the range of options available to utilities and power-system operators. Readers interested in the engineering fundamentals can explore ECAICO's battery energy storage system guide.
This August update examines the month's most significant projects, market trends, manufacturing activity, and technical advances from around the world. From gigawatt-scale installations to alternative battery chemistries, the latest progress shows how storage is becoming an essential companion to renewable energy technologies in modern power systems.
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| Global energy storage developments and technology – August 2026 |
Battery Storage Projects and Global Deployment
Large-scale energy storage deployment accelerated across several markets during August 2026, with major battery systems entering commercial operation and new projects moving toward construction. From gigawatt-scale installations in China to grid-forming batteries in Australia, these developments show how utility-scale storage is becoming an increasingly important part of modern electricity networks.
1. China Connects World's Largest Single-Site Grid-Forming LFP Battery System
China connected a 1 GW / 4 GWh lithium iron phosphate battery system to the grid in Inner Mongolia on August 3. Described by local government sources as the world's largest single-site grid-forming LFP battery storage plant, the four-hour DongSu facility is designed to strengthen grid stability and support renewable-energy integration.
2. Europe's Largest Operational Battery Comes Online in Scotland
The 500 MW / 1 GWh Coalburn 1 battery energy storage system entered commercial operation in South Lanarkshire, Scotland. The two-hour lithium-ion facility is now Europe's largest operational battery and will provide flexibility and resilience while supporting greater integration of renewable generation into the UK electricity system.
3. Australia's 650 MWh Mortlake Grid-Forming Battery Begins Operations
Origin Energy began commercial operation of the 300 MW / 650 MWh Mortlake BESS in Victoria, Australia. The facility uses grid-forming inverter technology and connects through a dedicated substation to the 500 kV transmission network, enabling energy storage alongside important stability and firming services for the power system.
4. BW ESS Acquires Australia's 1 GWh Yanco Battery Project
BW ESS acquired the ready-to-build 250 MW / 1,000 MWh Yanco BESS in New South Wales. The four-hour project is expected to begin construction later in 2026, with commercial operation planned for 2028, providing firming capacity, energy arbitrage, and system-security services to Australia's National Electricity Market.
5. China Advances 3.96 GWh Compressed-Air Energy Storage Project
China's 660 MW / 3.96 GWh Jiyuan compressed-air energy storage project entered the EPC tendering stage in Henan province. The six-hour facility will use advanced adiabatic technology to recover heat generated during compression and an underground cavern to store compressed air, expanding large-scale storage beyond conventional battery systems.
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| Major global energy storage projects – August 2026 |
Energy Storage Markets, Investment and Industry Expansion
Energy storage markets gained momentum during August 2026 as investment increased, manufacturing plans advanced, and governments prepared new mechanisms to support deployment. From record financing for hybrid renewable projects to emerging battery markets in Latin America, storage investment and industry activity are increasingly shaping the global energy transition.
6. Solar-Plus-Storage Investment Reaches Record $25 Billion
Global investment in co-located solar-plus-storage projects reached a record $25 billion in the first half of 2026, according to BloombergNEF data. The total was nearly double the level recorded in the second half of 2025 and three times the investment seen during the first half of that year, with the United States and Australia leading the segment.
7. Latin America Storage Capacity Forecast to Reach 34 GW by 2035
Wood Mackenzie raised its outlook for Latin American energy storage, forecasting capacity to increase from about 2.5 GW in 2025 to 34 GW by 2035. Chile currently leads regional deployment, while Brazil, Mexico, Argentina, and the Dominican Republic are emerging as important markets as renewable curtailment and grid constraints increase demand for storage.
8. Brazil Prepares for First Battery Storage Capacity Auction
Brazil's storage industry accelerated preparations for the country's first battery capacity-reserve auction, with suppliers pursuing local manufacturing partnerships to meet domestic-content requirements. Industry estimates presented at Intersolar South America indicated potential demand of 4 GW to 5 GW, highlighting the scale that the new auction framework could unlock.
9. Battery Manufacturing Expands Ahead of Brazil's Storage Market Growth
Brazilian and international companies are also positioning themselves for a developing domestic battery supply chain. Local-content requirements and favorable financing conditions for locally manufactured equipment are encouraging new battery manufacturing investment, linking the country's emerging storage market with a broader strategy for industrial development.
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| Global energy storage market and investment developments – August 2026 |
Energy Storage Technology and Next-Generation Solutions
Energy storage research continued to advance during August 2026, with new battery chemistries and material designs targeting higher energy density, improved durability, greater safety, and longer storage duration. Sodium-ion technology attracted particular attention, while research into ultra-long-duration storage demonstrated how future systems could complement conventional lithium-ion batteries in renewable-energy networks.
10. Sodium-Ion Pouch Cell Reaches 206 Wh/kg Energy Density
Researchers reported a sodium-ion pouch cell achieving an energy density of 206 Wh/kg using an iron-mediated strategy to improve reversible lattice-oxygen redox in the cathode. The cell retained 87.8% of its capacity after 100 cycles, demonstrating progress toward higher-energy sodium-ion batteries while addressing structural instability associated with oxygen-redox reactions.
11. Sodium-Ion Technology Demonstrates 97.9% Round-Trip Efficiency
Independent testing of UNIGRID's sodium chromium oxide cells measured at least 97.9% cell-level round-trip energy efficiency, while company cycle testing reported more than 1,000 full-depth-of-discharge cycles with over 99% capacity retained. UNIGRID and Syntropic Power also announced plans to deploy 1 GWh of sodium-ion energy storage systems during 2027.
12. Crystal-Grain Design Improves Sodium-Ion Battery Durability
Researchers demonstrated a new approach to improving sodium-ion cathodes by reshaping their internal crystal grains rather than changing the basic chemistry. The optimized material retained 96.7% of its capacity after 300 cycles at 5 C, showing how microstructural engineering can reduce internal stress and suppress cracking during repeated charging and discharging.
13. UK Launches £28 Million Ultra-Long-Duration Energy Storage Challenge
The UK launched a £28 million Ultra-Long-Duration Energy Storage Challenge to support technologies capable of storing clean energy for more than 100 hours. The program will focus on advanced electrochemical storage and underground hydrogen systems, targeting technologies that could eventually provide multi-day flexibility for electricity networks with high renewable-energy penetration.
Technology Note – Iron-Air Batteries Target 100-Hour Storage
The Faraday Institution also launched approximately £1.4 million of research funding for its UltraStore iron-air program. Up to five 18-month research projects will investigate iron-air electrochemical storage, with the program targeting a single-cell prototype capable of approximately 100 hours of discharge for future low-cost, long-duration applications.
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| Next-generation battery and long-duration energy storage developments – August 2026 |
Related Articles
- Energy Storage Update – July 2026
- Wind Energy Update – August 2026
- Solar Energy Update – August 2026
Summary
August 2026 highlighted the continuing expansion of the global energy storage industry, with major projects entering operation, new gigawatt-hour developments advancing toward construction, and investment supporting wider deployment. Grid-forming batteries, growing manufacturing activity, and emerging storage markets demonstrated how rapidly storage is becoming integrated into modern electricity systems.
At the same time, advances in next-generation storage technologies showed that the sector is expanding beyond conventional lithium-ion batteries. Sodium-ion development, compressed-air energy storage, and ultra-long-duration technologies are creating new options for different grid requirements, reinforcing energy storage as a key technology for integrating renewable generation and improving future power-system flexibility.
Frequently Asked Questions
1. What were the major energy storage developments in August 2026?
August 2026 saw several major storage developments, including the commissioning of large grid-scale battery systems, new gigawatt-hour projects moving toward construction, growing investment in solar-plus-storage, and continued progress in sodium-ion and long-duration energy storage technologies.
2. Why are grid-forming battery systems important for renewable energy?
Grid-forming battery systems can help establish and stabilize voltage and frequency rather than simply following an existing grid signal. This capability becomes increasingly valuable as power systems integrate more inverter-based renewable generation, such as solar and wind, and rely less on conventional synchronous generators.
3. Are sodium-ion batteries becoming a practical alternative to lithium-ion batteries?
Sodium-ion technology is advancing rapidly, with August 2026 research demonstrating improvements in energy density, efficiency, and cycle performance. Although lithium-ion remains dominant, sodium-ion batteries could become increasingly attractive for stationary storage where material availability, cost, safety, and long-term supply-chain resilience are important considerations.
4. Why is long-duration energy storage important for future power grids?
Long-duration energy storage can store surplus electricity for many hours or even several days and release it when renewable generation is low. Technologies such as compressed-air and iron-air storage could complement shorter-duration batteries, helping electricity networks manage extended renewable-energy fluctuations and improve overall grid flexibility.