LDES Startup Funding 2024-2026

What are all the funding deals in the LDES market from August 2024 to July 2026?

The table below lists every disclosed equity round raised by pure-play LDES companies between August 2024 and July 2026. We count as “pure-play” LDES companies those focused on electricity storage systems designed to discharge at rated power for at least 10 hours.

Each row shows the company, what it does, its category, the deal date, the funding stage, the round size, the region, the main investors, and the announcement source. For a wider view of how long-duration energy storage is developing, we cover it in our LDES market report.

How active has fundraising been in the LDES market?

As of July 2026, fundraising in the LDES market has been active but not broad in capital terms. Over the past 24 months, pure-play LDES companies raised 28 disclosed equity rounds and $1.57B in disclosed capital.

The market averaged 1.22 disclosed deals per month, with a median of 1 deal per month. That means the LDES market kept producing fundable companies, but not at a high monthly cadence.

Capital flow was more uneven than deal flow. The average raised per month was $68.42M, but the median was only $11.95M, which shows how large rounds distorted the monthly picture.

Removing rounds above $50M reduces disclosed capital from $1.57B to $301.88M. That means ordinary LDES funding is still a pilot, demonstration, and technical-validation market.

For more context on how this market is evolving, see our LDES market report covering long-duration storage funding.

How concentrated has fundraising been in the LDES market?

As of July 2026, fundraising in the LDES market has been highly concentrated. Over the past 24 months, the largest single round represented 25.73% of all disclosed capital, while the top 3 rounds represented 57.51%.

The top 5 rounds accounted for 73.59% of disclosed capital. The top 10 reached 88.81%, which means most of the market’s dollar story comes from a small group of companies.

Form Energy, EnerVenue, Hydrostor, Highview Power, and RayGen are not just large rows in the table. They define the capital signal in the LDES market.

This matters because market-size headlines can easily overstate broad commercialization. The LDES market looks large in aggregate, but much smaller when the largest scale-up rounds are removed.

How much of the LDES funding signal is driven by outliers?

As of July 2026, a large share of the LDES funding signal is driven by outliers. Over the past 24 months, 7 of 28 deals were above $50M, but those rounds explain most of the capital.

Only 25% of disclosed deals were megarounds above $50M. Yet without those rounds, disclosed capital falls to $301.88M, showing how much the headline total depends on a few validated platforms.

Rounds above $100M are even rarer. The dataset contains 4 such deals, representing 14.29% of all deals, but they dominate the funding narrative.

The median round size is $15.5M, compared with an average round size of $56.21M. In the LDES market, the median is a better guide to the normal company than the average.

If you want to go deeper on this concentration pattern, we cover it in our deeper analysis of the LDES market.

Which companies are driving the largest disclosed rounds in the LDES market?

As of July 2026, the largest disclosed LDES rounds are driven by a small set of companies with manufacturing, project, or commercialization pathways. Over the past 24 months, Form Energy, EnerVenue, Hydrostor, Highview Power, and RayGen created most of the market’s capital weight.

Form Energy raised the largest round, with $405M in October 2024. EnerVenue followed with $300M in March 2026, while Hydrostor raised $200M in February 2025.

Highview Power raised $171.1M in November 2025, and RayGen raised $82M in April 2025. These deals show that large checks usually attach to infrastructure credibility, production scale, or project pathways.

This is a useful reading rule for the LDES market. Duration claims matter, but investors write the biggest checks when storage duration is paired with deployability.

Is the LDES market broad with many targets, or narrow with few fundable companies?

As of July 2026, the LDES market is broad in technical experimentation but narrow in large-scale fundability. Over the past 24 months, the dataset includes 28 deals across 27 unique companies.

That looks broad at first because only Exowatt appears twice. But the capital distribution shows that most companies raised small pilot, seed, or early commercialization rounds.

Seed and Series A rounds represent 19 of 28 deals, or 67.86% of activity. They account for only 17.21% of disclosed capital, which shows how shallow the broad base still is.

Follow-on financings are the real capital engine. Companies with prior validation, strategic investors, factories, or project pipelines captured over 98% of disclosed capital in the LDES market.

Is LDES mostly an early-stage formation market or a late-stage scaling market?

As of July 2026, the LDES market is early-stage by deal count but late-stage by dollars. Over the past 24 months, Seed and Series A rounds produced 67.86% of deals, but only 17.21% of capital.

Late-stage and scale-up rounds captured $1.30B, or 82.79% of disclosed capital. That includes Series B and later rounds, plus growth equity rounds.

Series D+ is the largest stage by capital, with $487M across 2 deals. Growth Equity follows with $441.1M across 4 deals, while Series B is dominated by EnerVenue’s $300M round.

This split shows that the LDES market has many technologies being tested, but only a few companies are being financed for scale. Stage labels should be read alongside operational proof, not in isolation.

For a fuller view of stage maturity in this market, see our full market deck on LDES funding.

Which categories attract the most investor attention in LDES?

As of July 2026, Electrochemical LDES attracts the most investor attention in the LDES market. Over the past 24 months, the category raised $938.52M across 17 deals.

Electrochemical LDES represents 59.64% of disclosed capital and 60.71% of disclosed deals. Its leadership comes from breadth of company creation, not only from one unusually large round.

Mechanical Storage Systems rank second by capital, with $385.12M across 4 deals. Hydrostor and Highview Power give the category most of its weight.

Thermal Storage Power ranks third, with $227.7M across 5 deals. RedoxBlox, RayGen, Fourth Power, and Exowatt show that thermal-to-power storage is financeable when framed as dispatchable electricity infrastructure.

Which categories attract disproportionately large checks in the LDES market?

As of July 2026, Mechanical Storage Systems attract disproportionately large checks in the LDES market. Over the past 24 months, they represented 14.29% of deals but 24.47% of capital.

The category’s capital-share to deal-share ratio is 1.71, the highest in the dataset. That means mechanical storage companies raised larger checks than their deal count would suggest.

Electrochemical LDES sits near parity, with a ratio of 0.98. It leads the market overall, but its funding strength comes from breadth, not unusually high dollars per deal.

Thermal Storage Power has a ratio of 0.81, while Behind Meter LDES is 0.31 and Chemical Storage Power is 0.09. The LDES market still gives larger checks to categories with clearer grid, project, or infrastructure pathways.

Which geographies matter most for fundraising in the LDES market?

As of July 2026, North America matters most for fundraising in the LDES market. Over the past 24 months, the region raised $1.16B, equal to 73.62% of all disclosed capital.

North America also led by deal count, with 15 of 28 disclosed rounds. Its average deal size was $77.24M, while its median deal size was $20M.

Europe ranked second by capital, with $262.16M across 5 deals. Asia-Pacific ranked third by capital, with $152.93M across 8 deals.

The regional split is not only about activity. North America has stronger access to late-stage climate capital and manufacturing-scale financing, while Asia-Pacific shows stronger company formation than scale-up depth.

For more geography detail, explore our market report on LDES regional funding.

Is the LDES opportunity set broad or concentrated in one hub?

As of July 2026, the LDES opportunity set is concentrated in a few funding hubs rather than broadly global. Over the past 24 months, North America, Europe, and Asia-Pacific accounted for every disclosed deal in the dataset.

North America dominated capital with 73.62% of disclosed dollars. Europe followed with 16.66%, and Asia-Pacific contributed 9.72%.

Asia-Pacific is more important by deal count than by dollars. It produced 28.57% of deals but less than 10% of capital, which suggests a stronger formation market than scale-up financing market.

Latin America, the Middle East, and Africa had no retained disclosed pure-play LDES equity rounds in this dataset. That does not prove lack of demand, but it does show where public pure-play equity formation is currently visible.

Is LDES a market of small experiments or scaled financings?

As of July 2026, the LDES market is both a market of small experiments and scaled financings. Over the past 24 months, 16 deals were between $5M and $50M, while 7 deals were above $50M.

The size distribution shows a barbell structure. There were 4 deals below $5M, 12 deals from $5M to $20M, 5 deals from $20M to $50M, and 7 deals above $50M.

The missing middle matters. Only 5 deals sit in the $20M to $50M range, which suggests a difficult transition from pilot validation to deployment-scale financing.

The median round size of $15.5M is more representative than the $56.21M average. Most LDES companies raise technical proof capital, while a few validated platforms raise factory or infrastructure capital.

If you want to understand that scale-up gap better, read our LDES market report covering funding stages and round sizes.

Which technologies look most fragmented inside the LDES market?

As of July 2026, flow batteries look especially fragmented inside the LDES market. Over the past 24 months, the dataset includes vanadium, organic, aqueous, zinc-bromine, sulfur, iron-flow, and membrane-free designs.

This fragmentation is not necessarily negative. It shows that investors are still sampling multiple chemistries rather than converging around a single winning architecture.

Iron-based storage also appears across several forms. Form Energy, ESS Tech, Meine Electric, and FeX Energy all raised, but their round sizes range from $750K to $405M.

That spread shows why materials abundance alone is not enough. In the LDES market, manufacturing readiness, customer demand, and deployment credibility matter more than chemistry claims alone.

Who are the investors that appear the most in LDES fundraising?

As of July 2026, repeat investors in the LDES market are visible but limited. Over the past 24 months, only 6 named investors appeared in more than one disclosed deal.

Breakthrough Energy Ventures appears most often, with 3 deals across Form Energy, RedoxBlox, and Fourth Power. That makes it the clearest multi-company investor in the disclosed dataset.

Prelude Ventures appeared in 2 deals, backing Form Energy and RedoxBlox. The Grantham Foundation also appeared in 2 deals, backing Allegro Energy and Flux XII.

MVP Ventures and 8090 Industries appeared in both Exowatt rounds. Antares Ventures appeared in Sthyr Energy and FeX Energy, making it another investor with exposure across more than one LDES company.

One important caveat is that round announcements usually disclose total round size, not individual check size. Investor participation should therefore be read as deal presence, not exact capital committed.

Who is the author of this content?

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