XL Batteries
XL Batteries develops grid-scale, long-duration Organic Flow Battery systems using proprietary pH-neutral organic chemistry, serving data centers, utilities, and heavy industrial customers with non-flammable, low-cost storage targeting sub-$0.05/kWh.
- Company typePrivate
- Founded2019
- HeadquartersBrooklyn, United States
- Headcount11–50
- GTM typeB2B
- OfferingHardware or Manufacturing
What XL Batteries does
XL Batteries is a privately-held energy storage company developing grid-scale, long-duration Organic Flow Battery systems based on proprietary pH-neutral organic electrolyte chemistry dissolved in salt water. Founded in 2019 as a Columbia University spin-out, the company combines this patented organic chemistry with proven flow battery architecture, using globally abundant commodity chemicals and off-the-shelf components to avoid scarce or geopolitically constrained materials such as lithium and vanadium. The technology targets a levelized cost of storage under $0.05/kWh, 70%+ round-trip efficiency, a 20+ year lifespan, and non-flammable, non-toxic, non-corrosive operation. Product IP is granted in the United States and Japan with filings pending globally.
The company sells battery systems through direct enterprise sales to data center operators, utilities, and heavy industrial users. Revenue is generated via custom-engineered hardware sales with deployments ranging from demonstration-scale (333 kW) to commercial-scale (12.5 MW / 125 MWh), structured as multi-year agreements that begin with pilots and demonstration projects before scaling to commercial volumes. Named customers include Prometheus Hyperscale (multi-year hyperscale data center agreement with first commercial systems scheduled 2028-2029 at a Wyoming facility) and Stolthaven Terminals (first commercial pilot commissioned April 2025 at the Houston port). XL Batteries has raised approximately $28 million across Seed-stage rounds from Catalus Capital, Merrin Investors, Xerox Ventures, SIP Global, Myriad Venture Partners, and individual founding investors.
XL Batteries firmographics
Firmographics- Name
- XL Batteries
- Legal name
- XL Batteries, Inc.
- Website
- https://xlbatteries.com
- Company type
- Private
- Founded year
- 2019
- Operating status
- Operating
- Headcount range
- 11–50 employees
- Short description
- XL Batteries develops grid-scale, long-duration Organic Flow Battery systems using proprietary pH-neutral organic chemistry, serving data centers, utilities, and heavy industrial customers with non-flammable, low-cost storage targeting sub-$0.05/kWh.
- Ownership category
- akta.pro rank
XL Batteries industry classification
Industry- Product category
- Grid-Scale Energy Storage Systems
- NAICS
- Battery Manufacturing (33591)
- akta.pro primary industry
- Electrochemical LDES (Flow Batteries & Other Long-Duration Batteries) (EUAFADAA)
- akta.pro secondary industry
- Battery Cells (Li-ion, LFP, Sodium-ion, Lead-acid, NiMH) (IMAGAHAA)
Keywords
Where XL Batteries is headquartered
LocationHeadquarters
- HQ city
- Brooklyn
- HQ country
- United States
- HQ region
- North America
Offices2 records
Markets served
XL Batteries business model
Business model- GTM type
- B2B
- Offering type
- Hardware or Manufacturing
- Cost components
- Technology or R&D, Personnel, Supply Chain, Operations, Infrastructure, Marketing or Sales
Revenue model
- Battery System Sales: Sale of Organic Flow Battery systems to data centers, utilities, and industrial users. Revenue generated through demonstration projects, pilot deployments, and commercial-scale system sales. Systems range from 333 kW demonstration units to 12.5 MW/125 MWh commercial-scale deployments.
Go-to-market motion1 record
Distribution channels1 record
Marketing channels4 records
XL Batteries product offering
Product offeringCore offering
XL Batteries designs and sells Organic Flow Battery systems for grid-scale long-duration energy storage. The systems use proprietary, non-flammable, non-toxic, pH-neutral organic electrolytes dissolved in salt water inside a proven flow battery architecture, replacing scarce and corrosive vanadium or lithium with abundant commodity chemicals. Systems are custom-engineered for utilities, data centers, and heavy industry customers with capacities ranging from 333 kW demonstration units to multi-MW commercial-scale deployments.
Product overview
XL Batteries offers a single core product: the Organic Flow Battery, a grid-scale long-duration energy storage system. The technology combines proprietary organic chemistry with proven flow battery architecture to deliver safe, low-cost, and scalable energy storage. The system is designed for utilities, data centers, independent power producers, and heavy industry applications requiring durations from frequency regulation to multi-day storage.
Differentiator
Problem solved
Functional benefit
Products and services
- Organic Flow Battery Grid-scale long-duration energy storage system using proprietary organic chemistry dissolved in pH-neutral salt water inside a proven flow battery architecture. The non-flammable, non-toxic, non-corrosive battery delivers 70%+ round-trip efficiency, 20+ year lifespan, and a target levelized cost of storage under $0.05/kWh, with independent scaling of power output and storage capacity. Sold to utilities, data centers, and heavy industry customers in sizes ranging from 333 kW demonstration units to multi-MW commercial-scale deployments.
Quantifiable outcome
- 70%+ round-trip efficiency outperforming most energy storage solutions
- +4 more outcomes
Companies that use XL Batteries
Customer profileNamed customers2 records
Segments3 records
Ideal customer profiles3 records
XL Batteries technology and API
TechnologyTechnology focussed Yes
API detail
- Has API
- No
- API docs
- API detail
Core technology
AI maturity
App detail
Feature4 records
XL Batteries partnerships and signals
Strategic signalPartnerships
Two partnerships are on record, tiered core.
- Prometheus HyperscalecoreMulti-year agreement to deploy on-site long-duration Organic Flow Battery systems at Prometheus hyperscale data centers. First phase: 333 kW demonstration-scale system in 2027 at Wyoming facility. Followed by two 12.5 MW/125 MWh commercial-scale systems in 2028 and 2029. Partnership validates XL's technology for AI data center applications and positions the company for large-scale commercial deployment.
- Stolthaven TerminalscoreDevelopment partnership for industrial-scale flow battery electricity storage capability. Successfully commissioned first commercial Organic Flow Battery through paid pilot project. Partnership explores applications in port and industrial sector, supporting Stolthaven's carbon neutrality goals and potential decarbonization of surrounding areas.
Scale indicators5 records
Recent moves8 records
Expansion highlights6 records
XL Batteries competitors and assessment
Company assessmentDirect peers
- ESS Inc. ESS Inc. is a direct competitor developing iron flow battery technology for long-duration grid-scale energy storage. It targets the same utility, data center, and industrial customer segments with a similar flow-battery architecture, and is publicly traded (NYSE: GWH), serving as a key comparable for XL Batteries' commercial trajectory.
- Invinity Energy Systems: Invinity is a leading vanadium flow battery manufacturer focused on commercial and industrial long-duration storage. It competes head-to-head with XL in utility-scale and behind-the-meter applications, with similar product architecture and overlapping customer base.
- Quino Energy: Quino Energy is the most technologically analogous peer, developing organic flow battery chemistry for grid-scale storage. Like XL, it uses organic (non-vanadium) electrolytes and targets long-duration applications, making it a near-direct technology substitute.
- CMBlu Energy: CMBlu Energy is a German developer of organic flow battery technology using polymer-based electrolytes. It directly competes with XL on the same value proposition: safe, low-cost, long-duration storage without scarce metals, targeting utility and industrial customers globally.
- Largo Clean Energy: Largo Clean Energy, a division of Largo Resources, supplies vanadium redox flow battery systems for long-duration storage. It targets the same utility and commercial customers as XL and represents the incumbent chemistry approach that XL's organic alternative is seeking to displace.
- Redflow: Redflow is an Australia-based flow battery company using zinc-bromide chemistry for commercial and industrial storage. It competes with XL for behind-the-meter and remote industrial customers with similar modular flow-battery architecture.
- Enerox GmbH (CellCube): Enerox manufactures CellCube vanadium redox flow battery systems for commercial and industrial customers in Europe and globally. It serves the same long-duration storage customer segments as XL with a comparable containerized system delivery model.
Broad incumbents
- Sumitomo Electric Industries: Sumitomo Electric is a large industrial conglomerate with a long-running vanadium redox flow battery business for utility-scale storage. As a much larger incumbent, it offers overlapping capability but as part of a diversified portfolio rather than a dedicated LDES play.
- Lockheed Martin (GridStar Energy): Lockheed Martin's GridStar Energy storage product is a flow battery offering for grid applications. As a defense-prime incumbent with significant R&D resources, it overlaps with XL on grid storage offerings but operates as a small part of a much broader enterprise.
Market position
Strengths5 records
Weaknesses5 records
Competitive moat3 records
Key risks6 records
Key highlights7 records
Customer concentration
XL Batteries social profiles
Digital presenceXL Batteries financial estimates
Financial estimateRevenue estimate
Valuation estimate
XL Batteries leadership team
Management profileNumber of profiles
Profiles10 records
XL Batteries funding detail
Funding detailFunding overview
Funding rounds6 records
Investors6 records
Funding detail is available on the Subscription and Enterprise plan.Contact sales →
XL Batteries M&A and investment
M&A and investmentM&A
Investments
M&A and investment is available on the Subscription and Enterprise plan.Contact sales →
Frequently asked questions about XL Batteries
What does XL Batteries do?
XL Batteries designs and sells Organic Flow Battery systems for grid-scale long-duration energy storage. The systems use proprietary, non-flammable, non-toxic, pH-neutral organic electrolytes dissolved in salt water inside a proven flow battery architecture, replacing scarce and corrosive vanadium or lithium with abundant commodity chemicals. Systems are custom-engineered for utilities, data centers, and heavy industry customers with capacities ranging from 333 kW demonstration units to multi-MW commercial-scale deployments.
Is XL Batteries a public or private company?
XL Batteries is a private company. It is classified as venture growth investor backed and is currently operating.
When was XL Batteries founded?
XL Batteries was founded in 2019. It employs 11 to 50 people.
Where is XL Batteries based?
XL Batteries is headquartered in Brooklyn, United States, in the North America region.
How does XL Batteries make money?
One revenue line is on record: battery System Sales.
Who are XL Batteries's main competitors?
Direct peers on record are ESS Inc., Invinity Energy Systems, Quino Energy, CMBlu Energy, Largo Clean Energy, Redflow and Enerox GmbH (CellCube). Broad incumbents are Sumitomo Electric Industries and Lockheed Martin (GridStar Energy).
Does XL Batteries have an API?
No public API is recorded for XL Batteries.
What industry is XL Batteries in?
XL Batteries's product category is Grid-Scale Energy Storage Systems. Its primary akta.pro industry code is EUAFADAA, Electrochemical LDES (Flow Batteries & Other Long-Duration Batteries), with a secondary code of IMAGAHAA, Battery Cells (Li-ion, LFP, Sodium-ion, Lead-acid, NiMH). Its NAICS code is 33591.