What’s the latest funding news in the grid-scale battery storage market? (October 2026)
Whether you're building or investing in the grid-scale battery storage market, our report covers everything you need to know: the players, the money, and what's coming next.
The grid-scale battery storage market is attracting investment as electricity networks need more capacity to balance renewable generation and rising power demand.
Recent funding deals range from large infrastructure financing packages to venture rounds supporting new battery technologies and energy management software.
We reviewed 12 announced transactions through October 16, 2026, separating corporate equity from project financing, debt and provisional funding records.
And if you want to better understand this new industry, you can download our pitch covering the grid-scale battery storage market.
Insights
- The largest disclosed financing package reached $1.4 billion, but Jupiter Power used structured project financing to support ten battery installations rather than raising a conventional venture round. This distinction matters when measuring startup investment.
- Form Energy secured the largest clearly identified venture round in this selection, raising $750 million in Series G financing. Its iron-air batteries can deliver electricity for up to 100 hours, targeting multi-day grid reliability.
- Eight of the 12 selected transactions were announced in September 2026. The concentration reflects financing activity across utility-scale battery developers, storage software platforms and European battery system providers rather than one technology category.
- Corporate equity, project-level capital and mixed financing appear in the same funding headlines. GridStor's $58 million tax-equity transaction and SMT Energy's equity commitment of up to $268 million serve very different financial purposes.
- Five countries appear in the shortlist: the United States, United Kingdom, Sweden, Germany and Belgium. American companies account for several of the largest transactions, while European startups show particular activity in storage integration and optimization.
- Battery software businesses are attracting comparatively smaller early-stage investments. Furo raised a reported $4 million and Spine secured $3 million, illustrating demand for tools that improve battery dispatch, operational decisions and asset returns.
- European storage developers are combining funding instruments to accelerate construction. Tavion announced approximately $39.5 million in equity alongside separate debt, supporting three Polish battery parks with a combined capacity of 69 MW.
- Long-duration storage remains an important investment theme. Form Energy and Certain Energy are developing iron-air and manganese flow batteries, respectively, to provide electricity beyond the discharge duration of conventional lithium-ion systems.
- Second-life battery storage is creating another investment category. Rebaba raised $4.6 million to expand manufacturing based on reused electric-vehicle batteries, although its products also serve smaller commercial and distributed applications.
- Deal verification remains essential in grid-scale storage research. Thorpe Marsh Holdings has an estimated £34.6 million funding record, but its financing terms and valuation are not independently confirmed, unlike the directly announced corporate rounds.
Written by the New Market Pitch teamWe track new markets so founders and investors can move faster. About us
In our report covering the grid-scale battery storage market, you will always find fresh funding data, taken straight from our own verified funding database.
Summary table of the latest funding deals in the grid-scale battery storage market as of October 2026
We define the grid-scale battery storage market as battery systems that store electricity for grid-scale supply and balancing.
We include grid-connected battery manufacturers, system integrators, storage developers and operating platforms.
We exclude household-only batteries, electric-vehicle traction batteries and non-battery storage technologies.
The following table presents 12 recent funding announcements in chronological order, from newest to oldest, using reported or approximately converted US dollar amounts.
| Name | When | Amount in $ | Round Type | Category |
|---|---|---|---|---|
| GridStor | October 7, 2026 | $58M | Project tax equity | Utility-Scale Battery Storage Development & Operations |
| SMT Energy | September 22, 2026 | Up to $268M | Strategic corporate equity | Grid-Scale Battery Development & Asset Ownership |
| Jupiter Power | September 16, 2026 | $1,400M | Structured project financing | Utility-Scale Battery Storage & Grid Services |
| Thorpe Marsh Holdings | September 11, 2026 | Approx. $46M, estimated | Unverified capital injection | Battery Storage Project Holding Company |
| Tavion | September 10, 2026 | Approx. $39.5M equity; $58M total | Strategic equity & debt | Utility-Scale Battery Parks & Grid Flexibility |
| Spine Energy Technology | September 10, 2026 | $3M | Seed | Battery Asset Management & Decision Software |
| Furo | September 10, 2026 | $4M reported | Early-stage venture | Battery Optimization & Energy Trading Software |
| Rebaba | September 9, 2026 | $4.6M | Seed | Second-Life Battery Storage Systems |
| Octave.energy | September 4, 2026 | Approx. $11.6M combined | Series A & debt | Battery Storage Integration & Energy Management |
| Certain Energy | August 26, 2026 | Approx. $13M | Series A | Long-Duration Flow Battery Technology |
| Form Energy | August 12, 2026 | $750M | Series G | Iron-Air Batteries & Multi-Day Grid Storage |
| Frontier Power USA | August 5, 2026 | Approx. $263M | Strategic corporate equity | Utility-Scale Battery Development & Long-Duration Storage |
Funding amounts are not directly comparable because the table includes corporate equity, debt, tax equity, mixed financing and one estimated transaction. Currency conversions are indicative, and the list represents the latest identified deals in our research rather than an exhaustive global census.
All the latest funding deals in the grid-scale battery storage market as of October 2026
GridStor secured $58 million in project tax equity financing in October 2026
When was it?
GridStor announced the $58 million financing transaction on October 7, 2026.
Who are they?
GridStor develops, owns and operates utility-scale battery storage facilities that supply electricity when grid demand is high.
Geographical focus?
GridStor operates in the United States, developing battery projects in electricity markets including Texas, Arizona and Colorado.
Why do we include them in the grid-scale battery storage market?
GridStor directly develops and operates grid-connected battery energy storage systems, making it a clear example of the utility-scale battery developer and operator category.
What is the company stage?
GridStor is an established commercial operator with operating battery assets and additional projects under construction or development.
How much did they raise?
GridStor secured $58 million in project-level tax equity financing for a Texas battery project, rather than unrestricted corporate investment.
What round is it?
The transaction was structured as a partnership-flip tax-equity investment arranged by Foss & Company through its investment fund, with Western Alliance Bank backing.
Why did they raise?
GridStor used the financing to support its approximately 150 MW / 300 MWh Gunnar Reliability Project in Hidalgo County and monetize investment tax credits ahead of operation.
SMT Energy announced an equity partnership worth up to $268 million in September 2026
When was it?
SMT Energy announced the equity partnership on September 22, 2026.
Who are they?
SMT Energy develops, owns and operates battery storage installations while using software to optimize charging, electricity sales and asset returns.
Geographical focus?
SMT Energy operates in the United States, with a focus on Texas and other electricity markets offering opportunities for large-scale storage.
Why do we include them in the grid-scale battery storage market?
SMT Energy specializes in developing and operating grid-connected battery assets, placing the business in the utility-scale storage development and ownership category.
What is the company stage?
SMT Energy is a growth-stage storage operator with operating assets and a pipeline of additional developments.
How much did they raise?
SMT Energy agreed on a parent-company equity partnership of up to $268 million with Climate Adaptive Infrastructure, although the full amount was not necessarily disbursed immediately.
What round is it?
The transaction was a strategic corporate equity partnership rather than a conventional numbered venture round.
Why did they raise?
SMT Energy secured the partnership to accelerate battery project development, construction and ownership across the United States, using corporate equity alongside project-level financing.
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Jupiter Power announced $1.4 billion in battery project financing in September 2026
When was it?
Jupiter Power announced the financing package on September 16, 2026, following transactions that closed between April and July.
Who are they?
Jupiter Power develops and operates large battery storage installations that deliver electricity and grid-balancing services to wholesale power markets.
Geographical focus?
Jupiter Power focuses on the United States, with the announced financing supporting battery projects in Texas and Michigan.
Why do we include them in the grid-scale battery storage market?
Jupiter Power is a dedicated utility-scale battery developer and operator whose systems provide grid flexibility, electricity trading and energy storage services.
What is the company stage?
Jupiter Power is an established infrastructure growth company with operational projects, construction activity and a substantial development pipeline.
How much did they raise?
Jupiter Power secured approximately $1.4 billion across four financing transactions supporting ten battery projects totaling around 3.6 GWh of storage capacity.
What round is it?
The financing combined senior secured project debt, tax-equity bridge loans and an investment-grade private placement, rather than a conventional corporate equity round.
Why did they raise?
Jupiter Power arranged the financing to develop and build additional battery assets and expand its ability to provide reliable electricity and grid services.
Thorpe Marsh Holdings was reported to have secured approximately $46 million in September 2026
When was it?
Thorpe Marsh Holdings appeared in a funding report dated September 11, 2026, although the precise transaction terms remain unverified.
Who are they?
Thorpe Marsh Holdings is a holding company associated with a major battery storage development at a former power station site in South Yorkshire.
Geographical focus?
Thorpe Marsh Holdings is based in the United Kingdom and is linked to the Thorpe Marsh battery development in South Yorkshire.
Why do we include them in the grid-scale battery storage market?
Thorpe Marsh Holdings is connected to an infrastructure project designed to store and release electricity into the UK grid, placing it in the battery project holding-company category.
What is the company stage?
Thorpe Marsh Holdings is associated with an infrastructure project in the construction and development stage rather than a conventional technology startup.
How much did they raise?
Thorpe Marsh Holdings was reported to have raised approximately £34.6 million, or around $46 million, but the figure comes from a database estimate and remains provisional.
What round is it?
The reported transaction was described as a private capital injection, with no independently confirmed venture-round designation or disclosed financing structure.
Why did they raise?
The reported funding appears connected to the corporate and investment structure supporting the Thorpe Marsh battery storage project, although its specific use has not been independently confirmed.
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Tavion raised approximately $39.5 million in equity during September 2026
When was it?
Tavion announced its new financing package on September 10, 2026.
Who are they?
Tavion is a Swedish energy company developing, owning and operating large battery parks that provide flexibility to European electricity grids.
Geographical focus?
Tavion is based in Sweden and is beginning commercial development in Poland, with ambitions to expand across European electricity markets.
Why do we include them in the grid-scale battery storage market?
Tavion directly develops and owns utility-scale battery facilities, making the company a dedicated battery storage developer and independent power producer.
What is the company stage?
Tavion is in early commercial growth, moving its initial battery developments toward construction while building a broader European project pipeline.
How much did they raise?
Tavion secured €34 million in equity, approximately $39.5 million, alongside €16 million in separate debt financing, creating a combined package of approximately $58 million.
What round is it?
The transaction was an oversubscribed strategic equity financing led by Leitmotif and Oberon Capital Management, with participation from BackingMinds and Course Corrected VC, alongside separate debt.
Why did they raise?
Tavion raised the capital to begin building three battery parks in Poland totaling 69 MW and advance its wider 1.7 GW project pipeline.
Spine Energy Technology secured $3 million in seed financing in September 2026
When was it?
Spine Energy Technology announced its seed financing on September 10, 2026.
Who are they?
Spine Energy Technology develops software that helps energy asset managers monitor battery performance, assess risk and automate operational decisions.
Geographical focus?
Spine Energy Technology is based in the United Kingdom and initially serves British battery asset managers, with plans for international expansion.
Why do we include them in the grid-scale battery storage market?
Spine Energy Technology initially focuses on grid-scale battery portfolio management, although its broader renewable-energy ambitions make its exclusive battery market exposure less certain.
What is the company stage?
Spine Energy Technology is in the early commercial stage, with a live software product, initial revenue and customers managing utility-scale battery portfolios.
How much did they raise?
Spine Energy Technology raised $3 million from two UK family offices and existing investors.
What round is it?
The financing was a seed round co-led by two unnamed family offices based in the United Kingdom.
Why did they raise?
Spine Energy Technology raised funding to develop its decision-engine platform, expand engineering resources and serve more renewable asset managers.
In our document detailing everything you need to know about grid-scale battery storage, we always try to gather several sources and make estimates that make sense, so you can work with solid numbers.
Furo secured a reported $4 million in funding in September 2026
When was it?
Furo's financing was reported on September 10, 2026, with company announcements also appearing on September 11.
Who are they?
Furo develops software that predicts electricity prices and automatically controls industrial battery charging, discharging and energy trading.
Geographical focus?
Furo is based in Munich, Germany, and targets European commercial and industrial battery storage markets.
Why do we include them in the grid-scale battery storage market?
Furo provides dedicated battery optimization and energy-management software for grid-connected industrial storage systems, although its installations are not necessarily utility-scale.
What is the company stage?
Furo is in early commercial growth, with deployed software and enterprise customers including Deutsche Bahn.
How much did they raise?
Furo reported $4 million in financing, although a German-language announcement described €4 million, leaving the original currency inconsistent across announcements.
What round is it?
The financing was an early-stage venture round led by TQ Ventures, with Neo, Sandberg Bernthal Venture Partners and CDTM Venture Capital participating.
Why did they raise?
Furo secured the investment to improve its battery optimization platform, recruit engineers and expand into additional European electricity markets.
Rebaba raised $4.6 million in seed funding in September 2026
When was it?
Rebaba announced its funding round on September 9, 2026.
Who are they?
Rebaba manufactures stationary energy storage systems using repurposed electric-vehicle batteries and its own battery management technology.
Geographical focus?
Rebaba operates from Sweden and is expanding its commercial presence across Europe, including Germany, Austria, Switzerland and France.
Why do we include them in the grid-scale battery storage market?
Rebaba manufactures stationary batteries that can support grid flexibility, although its residential and smaller commercial products make its grid-scale specialization less certain.
What is the company stage?
Rebaba is in seed-stage commercial expansion, with deployed storage systems and plans to increase manufacturing capacity.
How much did they raise?
Rebaba raised $4.6 million, equivalent to approximately SEK 44.1 million, in an oversubscribed financing round.
What round is it?
The seed round was led by Sistafund alongside EIT Urban Mobility, with participation from existing shareholders and additional European investors.
Why did they raise?
Rebaba secured the funding to increase annual production capacity at its Stockholm CircularHub to 40 MWh, recruit employees and establish more European manufacturing facilities.
Our report covering the grid-scale battery storage market gets updated several times a month, so you always get the latest view of where things stand.
Octave.energy secured approximately $11.6 million in combined financing in September 2026
When was it?
Octave.energy's funding announcement was publicly reported on September 4, 2026.
Who are they?
Octave.energy supplies battery storage systems and energy-management software that help businesses reduce electricity costs and participate in flexibility markets.
Geographical focus?
Octave.energy is based in Belgium and is expanding into the Netherlands, France and Germany.
Why do we include them in the grid-scale battery storage market?
Octave.energy integrates grid-connected batteries with operating software, placing the company in the battery system integration and energy-management category, primarily for commercial and industrial customers.
What is the company stage?
Octave.energy is in profitable commercial growth, with an established customer base and operational battery installations.
How much did they raise?
Octave.energy secured €10 million, approximately $11.6 million, through a combination of equity and flexible debt, without a disclosed split between the instruments.
What round is it?
The transaction was described as Series A financing led by SPDG Growth, with imec.istart, BNP Paribas Fortis and KBC participating in the combined financing.
Why did they raise?
Octave.energy raised the capital to establish teams in additional European markets and further develop its integrated battery storage and energy-management systems.
Certain Energy raised approximately $13 million in Series A funding in August 2026
When was it?
Certain Energy announced its Series A financing on August 26, 2026.
Who are they?
Certain Energy, formerly RFC Power, develops manganese-based flow batteries designed to store electricity for extended periods and support grid stability.
Geographical focus?
Certain Energy is based in the United Kingdom and plans an initial MWh-scale demonstration in India, with longer-term international commercial ambitions.
Why do we include them in the grid-scale battery storage market?
Certain Energy develops batteries specifically for long-duration grid storage, placing the business in the advanced flow-battery manufacturing category.
What is the company stage?
Certain Energy is at the pre-commercial scale-up stage, preparing its technology for grid-connected demonstration and future manufacturing.
How much did they raise?
Certain Energy secured £10 million, equivalent to approximately $13 million depending on the exchange rate used.
What round is it?
The Series A round was led by the British Business Bank, with participation from Centrica, Ceres Power Holdings and Temasek Trust's Catalytic Capital for Climate and Health.
Why did they raise?
Certain Energy raised the funding to develop its first MWh-class grid-connected system, expand research facilities in the United Kingdom and establish a manufacturing supply chain.
In our research about grid batteries, we look at what the winners do differently, so you can learn from the best instead of guessing.
Form Energy secured $750 million in Series G financing in August 2026
When was it?
Form Energy announced its Series G round on August 12, 2026.
Who are they?
Form Energy manufactures iron-air battery systems designed to supply electricity for up to 100 hours, helping grids manage extended supply shortages.
Geographical focus?
Form Energy is headquartered in the United States and is expanding manufacturing in West Virginia while pursuing commercial deployments with utility and energy customers.
Why do we include them in the grid-scale battery storage market?
Form Energy develops battery technology specifically for multi-day electricity storage, making it a dedicated long-duration grid-scale battery manufacturer.
What is the company stage?
Form Energy is scaling industrial manufacturing and entering broader commercial deployment, moving beyond technology demonstration toward large-volume battery production.
How much did they raise?
Form Energy raised $750 million, bringing its cumulative reported equity funding to more than $2 billion.
What round is it?
The Series G financing was led by T. Rowe Price, with investors including Sequoia Capital, Janus Henderson, Franklin Templeton, PEAK6 Investments and returning institutional backers.
Why did they raise?
Form Energy secured the capital to expand manufacturing capacity at its Form 1 factory in West Virginia and accelerate commercial deployment of long-duration iron-air batteries.
Frontier Power USA completed approximately $263 million in equity financing in August 2026
When was it?
Frontier Power USA publicly announced the completed financing on August 5, 2026.
Who are they?
Frontier Power USA develops utility-scale battery projects and helps move installations through engineering, financing, procurement and construction preparation.
Geographical focus?
Frontier Power USA operates in the United States, developing battery infrastructure in high-demand domestic electricity markets.
Why do we include them in the grid-scale battery storage market?
Frontier Power USA focuses on developing and financing utility-scale battery installations, particularly long-duration storage projects, placing it in the battery infrastructure development category.
What is the company stage?
Frontier Power USA is a growth-stage infrastructure development platform with late-stage battery projects progressing toward construction.
How much did they raise?
Frontier Power USA announced approximately $263 million in equity financing, consisting of $100 million from Cerberus-affiliated investors, about $113 million from Eos Energy Enterprises and $50 million from Hudson Bay.
What round is it?
The financing was a strategic corporate equity transaction backed by institutional and industrial investors rather than a numbered venture capital round.
Why did they raise?
Frontier Power USA secured the investment to advance construction-ready battery developments, including its 800 MWh Blanquilla project, and accelerate deployment of long-duration storage infrastructure.
Written by the New Market Pitch teamWe track new markets so founders and investors can move faster. About us
