What are the latest funding news in the LDES market? (July 2026)
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In our LDES market deck, you will find everything you need to understand the market
The LDES market kept attracting capital in 2025 and 2026, but the money was not spread evenly across technologies.
Large rounds went mostly to commercial scale-up companies, while earlier rounds supported flow battery chemistry, iron-air systems, and gravity storage pilots.
Recent funding also showed a clear link between long-duration electricity storage, data-center power demand, and grid resilience.
And if you want to better understand this new industry, you can download our pitch covering the LDES market.
Insights
- The 12 latest LDES funding deals totaled roughly $644M, but EnerVenue and Highview Power alone represented about 73% of disclosed capital
- Electrochemical storage dominated the latest LDES market funding news, with eight of 12 companies working on flow, metal-hydrogen, iron-flow, or iron-air systems
- Europe was the most active region by company count, while the largest single round went to EnerVenue’s manufacturing expansion across the U.S. and China
- Data-center power demand became a visible funding driver, especially for CMBlu Energy and Exowatt, where long-duration storage is positioned as dispatchable baseload support
- Flow battery innovation remained highly fragmented, with organic, sulfur-based, iron-flow, aqueous organic, and membrane-free approaches all raising capital
- Several qualifying LDES companies were still before full commercialization, which shows investors are funding technical validation as well as infrastructure deployment
- The strict 10-hour discharge filter removes some companies marketed as long-duration storage, making the LDES market smaller but more comparable
- Public and strategic investors played a visible role, suggesting LDES funding is tied to energy security, grid planning, and industrial policy as much as venture returns
As this chart shows, and as featured in our LDES market deck, search interest in long-duration energy storage has been rising steadily
Summary table of the latest funding deals in the LDES market as of July 2026
We define the LDES market as electricity storage systems designed to discharge at rated power for at least 10 hours.
We include grid-connected and behind-the-meter assets whose primary function is shifting electricity over 10+ hours to multi-day timescales, across electrochemical, mechanical, thermal-to-power, and chemical storage technologies.
We exclude short-duration storage under 10 hours, demand response, and fuel or heat value chains that are not procured and operated as an electricity storage system.
You can also read our detailed analysis to understand how funding activity in the LDES market has evolved over the last few years.
We also have a quarter-by-quarter analysis of funding activity in the market here.
Finally, you can check our complete list of fundraising deals for the LDES market (we update this list every quarter) as well as our ranking of the most funded startups.
| Name | When | Amount in $ | Round Type | Category |
|---|---|---|---|---|
| CMBlu Energy | 30 April 2026 | ~$58.6M | Series C initial close | Organic Flow Battery & Utility-Scale LDES |
| EnerVenue | 31 March 2026 | $300.0M | Series B extension | Metal-Hydrogen Battery & Stationary Storage |
| Sinergy Flow | 25 February 2026 | ~$8.25M | Late seed | Sulfur Flow Battery & Grid Storage |
| ESS Tech | 30 January 2026 | $15.0M | Registered direct offering | Iron Flow Battery & Utility Storage |
| Meine Electric | 22 January 2026 | $0.75M | Pre-seed | Iron-Air Battery & Grid Storage |
| Kodiaq Technologies | 10 December 2025 | ~$1.1M | Early funding | Organic Electrolytes & Flow Battery Materials |
| Exowatt | 12 November 2025 | $50.0M | Series A extension | Thermal-to-Power Storage & Data-Center Power |
| Highview Power | 11 November 2025 | ~$171.1M | Project and growth capital | Liquid-Air Energy Storage & Grid Infrastructure |
| Quino Energy | 10 November 2025 | $10.0M, plus $6.0M option | Series A | Organic Flow Battery & Electrolyte Production |
| Flux XII | 3 November 2025 | $3.95M | Seed | Aqueous Organic Flow Battery & Grid Materials |
| Sizable Energy | 22 October 2025 | $8.0M | Seed | Offshore Gravity Storage & Pumped Hydro |
| Unbound Potential | 19 September 2025 | ~$16.9M package | Pre-seed package | Membrane-Free Redox Flow Battery & Stationary Storage |
All the latest funding deals during in the LDES market as of July 2026
CMBlu Energy raised about $58.6M in April 2026
When was it?
The deal was announced on 30 April 2026.
Who are they?
CMBlu Energy builds non-lithium SolidFlow batteries for 10+ hour dispatchable electricity storage.
Geographical focus?
CMBlu Energy is focused on Germany and Europe first, with global utility, industrial, and data-center ambitions.
Why do we include them in the LDES market?
CMBlu Energy qualifies because SolidFlow batteries are designed for ten hours or more of dispatchable electricity, in the organic flow battery category.
What is the company stage?
CMBlu Energy is at growth and commercial scale-up stage, with large customer frameworks and industrial deployment plans.
How much did they raise?
CMBlu Energy raised €50M, which is about $58.6M.
What round is it?
The financing was the initial close of a Series C round.
Why did they raise?
CMBlu Energy raised to scale non-lithium long-duration storage for AI data centers, utilities, and mission-critical baseload power.
EnerVenue raised $300M in March 2026
When was it?
The deal was announced on 31 March 2026.
Who are they?
EnerVenue builds aqueous metal-hydrogen battery systems for large-scale stationary electricity storage.
Geographical focus?
EnerVenue is expanding from the U.S. into China, Asia-Pacific, the Middle East, and Europe.
Why do we include them in the LDES market?
EnerVenue qualifies because its metal-hydrogen batteries target long-duration stationary electricity storage for grid and commercial customers.
What is the company stage?
EnerVenue is at growth and manufacturing scale-up stage, with capital going into factory capacity and commercialization.
How much did they raise?
EnerVenue raised $300.0M in this financing.
What round is it?
The financing was reported as a Series B extension or Series B+ preferred stock financing.
Why did they raise?
EnerVenue raised to scale manufacturing, build supply chains, fund R&D, and expand deployments globally.
This chart, included in our LDES market deck, compares the main business model options for long-duration energy storage developers
Sinergy Flow raised about $8.25M in February 2026
When was it?
The deal was announced on 25 February 2026.
Who are they?
Sinergy Flow develops sulfur-based redox flow batteries for low-cost stationary electricity storage.
Geographical focus?
Sinergy Flow is focused on Italy and Europe first, especially utility-scale and standalone grid storage.
Why do we include them in the LDES market?
Sinergy Flow qualifies because its sulfur flow battery is purpose-built for long-duration electricity storage.
What is the company stage?
Sinergy Flow is at MVP and industrial validation stage, moving from proof of technology toward larger commercial validation.
How much did they raise?
Sinergy Flow raised €7M, which is about $8.25M.
What round is it?
The financing was a late seed round.
Why did they raise?
Sinergy Flow raised to industrialize the technology, expand the team, validate larger systems, and prepare for market entry.
ESS Tech raised $15M in January 2026
When was it?
The transaction closed on 30 January 2026.
Who are they?
ESS Tech manufactures iron-flow battery systems for commercial and utility-scale storage.
Geographical focus?
ESS Tech is mainly focused on the U.S., with utility, commercial, and industrial customers.
Why do we include them in the LDES market?
ESS Tech qualifies because iron-flow batteries are its core long-duration electricity storage product.
What is the company stage?
ESS Tech is a public growth-stage manufacturer, but still in a capital-intensive scale-up phase.
How much did they raise?
ESS Tech raised $15.0M in gross proceeds.
What round is it?
The financing was a registered direct offering, not a venture round.
Why did they raise?
ESS Tech raised to fund working capital and general corporate purposes.
This chart, included in our LDES market deck, looks at Form Energy’s strategy in long-duration energy storage
Meine Electric raised $0.75M in January 2026
When was it?
The deal was announced on 22 January 2026.
Who are they?
Meine Electric develops iron-air batteries for grid and commercial long-duration storage.
Geographical focus?
Meine Electric is focused on India and APAC first, with grid and commercial-industrial storage as its core market.
Why do we include them in the LDES market?
Meine Electric qualifies because its iron-air technology targets 16 to 24 hours of electricity storage.
What is the company stage?
Meine Electric is at pre-product and pilot-ready prototype stage, moving from lab prototypes toward grid-connected systems.
How much did they raise?
Meine Electric raised $0.75M.
What round is it?
The financing was a pre-seed round.
Why did they raise?
Meine Electric raised to build a multi-kilowatt prototype and move toward pilot iron-air battery systems.
Kodiaq Technologies raised about $1.1M in December 2025
When was it?
The round was completed on 10 December 2025 and reported on 16 December 2025.
Who are they?
Kodiaq Technologies develops organic electrolytes that can improve metal-free flow batteries.
Geographical focus?
Kodiaq Technologies is focused on the UK and Europe first.
Why do we include them in the LDES market?
Kodiaq Technologies qualifies because its electrolyte technology is designed to enable scalable long-duration flow battery systems.
What is the company stage?
Kodiaq Technologies is at MVP and pilot stage, moving from lab validation toward pilot projects.
How much did they raise?
Kodiaq Technologies raised £850k, which is about $1.1M.
What round is it?
The financing was an early funding round with pre-seed characteristics.
Why did they raise?
Kodiaq Technologies raised to scale organic electrolyte development, support pilots, and prepare for broader commercialization.
In our LDES market deck, we identify pain points entrepreneurs should prioritize
Exowatt raised $50M in November 2025
When was it?
The deal was announced on 12 November 2025.
Who are they?
Exowatt builds dispatchable solar-thermal systems that store heat and convert it back into electricity.
Geographical focus?
Exowatt is focused on the U.S., especially AI data centers and high-load industrial customers.
Why do we include them in the LDES market?
Exowatt qualifies because the P3 system stores energy thermally and delivers electricity for behind-the-meter customers.
What is the company stage?
Exowatt is at growth and early commercial scale-up stage, with manufacturing expansion and customer deployments underway.
How much did they raise?
Exowatt raised $50.0M in additional funding.
What round is it?
The financing was an extension to the company’s April 2025 Series A.
Why did they raise?
Exowatt raised to scale U.S. manufacturing and accelerate P3 deployments for AI-era power demand.
Highview Power raised about $171.1M in November 2025
When was it?
The deal was announced on 11 November 2025.
Who are they?
Highview Power develops liquid-air energy storage projects for grid-scale electricity storage.
Geographical focus?
Highview Power is focused on the UK, especially Scotland and England.
Why do we include them in the LDES market?
Highview Power qualifies because liquid-air plants can store electricity and return it as grid-scale power over long durations.
What is the company stage?
Highview Power is at project deployment and infrastructure scale-up stage, with large UK LDES facilities moving toward construction.
How much did they raise?
Highview Power raised £130M, which is about $171.1M.
What round is it?
The financing was project and growth capital.
Why did they raise?
Highview Power raised to fund phase one of the Hunterston 3.2 GWh long-duration energy storage facility.
This market map, featured in our LDES market deck, highlights top companies and startups in the LDES market
Quino Energy raised $10M in November 2025
When was it?
The deal was announced on 10 November 2025.
Who are they?
Quino Energy develops water-based organic flow battery electrolytes for mid-duration and long-duration storage.
Geographical focus?
Quino Energy is U.S.-focused first, with global commercialization plans through Atri Energy Transition.
Why do we include them in the LDES market?
Quino Energy qualifies because its organic flow battery chemistry targets 8 to 24+ hour storage, including qualifying 10+ hour deployments.
What is the company stage?
Quino Energy is at pilot and early commercialization stage, scaling electrolyte production and field demonstrations.
How much did they raise?
Quino Energy raised $10.0M, with an option for an additional $6.0M.
What round is it?
The financing was a Series A round.
Why did they raise?
Quino Energy raised to expand electrolyte production and demonstrate the chemistry in real-world field pilots.
Flux XII raised $3.95M in November 2025
When was it?
The press release was dated 3 November 2025 and reported by funding publications shortly after.
Who are they?
Flux XII develops aqueous organic flow battery materials and modules for grid-scale energy storage.
Geographical focus?
Flux XII is focused on the U.S., targeting utilities, grid developers, data centers, and large electricity users.
Why do we include them in the LDES market?
Flux XII qualifies because its aqueous organic flow battery platform is built for long-duration grid storage.
What is the company stage?
Flux XII is at MVP and prototype stage, with scaled materials production and kilowatt-scale prototypes under testing.
How much did they raise?
Flux XII raised $3.95M.
What round is it?
The financing was a seed round.
Why did they raise?
Flux XII raised to scale electrolyte and membrane production, test prototypes, and design a containerized battery system.
This chart, included in our LDES market deck, illustrates yearly funding for LDES startups
Sizable Energy raised $8M in October 2025
When was it?
The deal was announced on 22 October 2025.
Who are they?
Sizable Energy develops offshore pumped-hydro-style storage using gravity, ocean depth, and dense brine.
Geographical focus?
Sizable Energy is focused on Italy and the Mediterranean first, with broader global project ambitions.
Why do we include them in the LDES market?
Sizable Energy qualifies because its ocean-based gravity system is designed for large-scale, long-duration electricity storage.
What is the company stage?
Sizable Energy is at seed and sea-trial validation stage, after wave-basin testing and before commercial deployment.
How much did they raise?
Sizable Energy raised $8.0M.
What round is it?
The financing was a seed or early-stage round.
Why did they raise?
Sizable Energy raised to move from wave-basin validation to sea trials and accelerate commercialization.
Unbound Potential raised about $16.9M in September 2025
When was it?
The financing was announced on 19 September 2025.
Who are they?
Unbound Potential develops membrane-free redox flow batteries for stationary storage.
Geographical focus?
Unbound Potential is focused on Switzerland and Europe first.
Why do we include them in the LDES market?
Unbound Potential qualifies because its membrane-free redox flow battery platform is built for stationary long-duration electricity storage.
What is the company stage?
Unbound Potential is at pre-seed and pilot-development stage, with capital intended to prove scalability in initial pilots.
How much did they raise?
Unbound Potential raised a €14.4M package, which is about $16.9M.
What round is it?
The financing was a pre-seed funding package, including investment and non-dilutive grants.
Why did they raise?
Unbound Potential raised to accelerate membrane-free flow battery development and demonstrate scalability in pilot projects.
Related blog posts
- How strong is fundraising in the LDES market right now?
- What is the latest news in the LDES market?
- What is the real size of the LDES market?
- How funding activity has evolved in the LDES market
- What are the fundraising trends in the LDES market?
- A complete list of funding deals in the LDES market
- The startups that have raised the most funding in the LDES market
