Top 41 Energy Storage startups in USA
May 05, 2026
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28
1
Funding: $4.9B
Recurrent Energy, a subsidiary of Canadian Solar Inc. (global renewable energy company) that is building one of the world's largest and most geographically diversified platforms for developing, owning and operating solar and energy storage projects. It is a leading global developer, owner and operator of solar and energy storage systems, with over 14 GW of project capacity under long-term operation and maintenance agreements.
Recurrent Energy, a subsidiary of Canadian Solar Inc. (global renewable energy company) that is building one of the world's largest and most geographically diversified platforms for developing, owning and operating solar and energy storage projects. It is a leading global developer, owner and operator of solar and energy storage systems, with over 14 GW of project capacity under long-term operation and maintenance agreements.
2
Funding: $2.9B
Eos produces zinc-based battery energy storage systems. The company's technology overcomes the limitations of traditional lithium-ion batteries paovides discharge time from 3 to 12 hours. The Eos Z3 zinc-based wet battery module includes zinc cathode, aqueous electrolyte, bipolar electrodes and polymer housing. The electrodes offer high mechanical strength, corrosion resistance and chemical stability, ensuring years of operation with virtually no degradation. Furthermore, the bipolar structure simplifies the battery's internal connections, reducing internal resistance and increasing energy conversion efficiency. The company is also developing a software platform for managing the energy storage system, which implements real-time intelligence, advanced control capabilities and AI-based analytics.
Eos produces zinc-based battery energy storage systems. The company's technology overcomes the limitations of traditional lithium-ion batteries paovides discharge time from 3 to 12 hours. The Eos Z3 zinc-based wet battery module includes zinc cathode, aqueous electrolyte, bipolar electrodes and polymer housing. The electrodes offer high mechanical strength, corrosion resistance and chemical stability, ensuring years of operation with virtually no degradation. Furthermore, the bipolar structure simplifies the battery's internal connections, reducing internal resistance and increasing energy conversion efficiency. The company is also developing a software platform for managing the energy storage system, which implements real-time intelligence, advanced control capabilities and AI-based analytics.
3
Funding: $1.6B
Form Energy develops and manufactures multi-day energy storage systems based on iron-air batteries. These batteries are capable cost-effectively store energy for 100 consecutive hours (unlike lithium-ion batteries, which can only provide energy for a few hours). The batteries are made from safe, inexpensive and abundant materials: iron, water and air. Form Energy operates its own large-scale battery manufacturing facility in West Virginia. The company also develops software for modeling renewable energy systems that take into account modern energy market.
Form Energy develops and manufactures multi-day energy storage systems based on iron-air batteries. These batteries are capable cost-effectively store energy for 100 consecutive hours (unlike lithium-ion batteries, which can only provide energy for a few hours). The batteries are made from safe, inexpensive and abundant materials: iron, water and air. Form Energy operates its own large-scale battery manufacturing facility in West Virginia. The company also develops software for modeling renewable energy systems that take into account modern energy market.
4
Funding: $737.6M
Stem develops PowerTrack - the system for managing energy storage systems and solar power plants. It continuously collects and analyzes millions of data points throughout the project lifecycle, providing comprehensive digital monitoring of operations at the asset and portfolio levels. It also leverages artificial intelligence to forecast demand and repairs, providing deep and simple analytics to help organizations automate energy cost savings and protect against tariff fluctuations. Stem also provides power plant management services - a solution for clients seeking to outsource design, procurement, commission, operation and optimize their energy storage and hybrid systems. The company manages solar assets across 200,000+ sites worldwide.
Stem develops PowerTrack - the system for managing energy storage systems and solar power plants. It continuously collects and analyzes millions of data points throughout the project lifecycle, providing comprehensive digital monitoring of operations at the asset and portfolio levels. It also leverages artificial intelligence to forecast demand and repairs, providing deep and simple analytics to help organizations automate energy cost savings and protect against tariff fluctuations. Stem also provides power plant management services - a solution for clients seeking to outsource design, procurement, commission, operation and optimize their energy storage and hybrid systems. The company manages solar assets across 200,000+ sites worldwide.
5
Funding: $654.2M
NineDot Energy creates innovative energy solutions that make the urban grid cleaner, more resilient and less costly. It wants to turn underused properties into community battery-farm projects.NineDot Energy is building and operating community-scale battery energy storage systems (BESS) in the New York City metropolitan area. With sites in the Bronx, Brooklyn, Queens, and Staten Island, as well as Westchester County and Long Island, NineDot Energy is helping make our local grid cleaner, more resilient, equitable and affordable. The company plans to develop and build more than 400 megawatts (MW) of clean energy systems by the end of 2026, strengthening local grid infrastructure and providing clean, reliable, and resilient power to tens of thousands of New York City homes and businesses, supporting New York State's mission to achieve 100% clean energy by 2040.
NineDot Energy creates innovative energy solutions that make the urban grid cleaner, more resilient and less costly. It wants to turn underused properties into community battery-farm projects.NineDot Energy is building and operating community-scale battery energy storage systems (BESS) in the New York City metropolitan area. With sites in the Bronx, Brooklyn, Queens, and Staten Island, as well as Westchester County and Long Island, NineDot Energy is helping make our local grid cleaner, more resilient, equitable and affordable. The company plans to develop and build more than 400 megawatts (MW) of clean energy systems by the end of 2026, strengthening local grid infrastructure and providing clean, reliable, and resilient power to tens of thousands of New York City homes and businesses, supporting New York State's mission to achieve 100% clean energy by 2040.
7
Funding: $431.2M
ESS creates long-duration energy storage (LDES) systems ideal for AI data centers, commercial and industrial facilities, utilities, microgrids and off-grid applications. They utilize an innovative iron-flow flow battery system, that uses natural elements such as iron, salt and water as electrolytes. Iron Flow technology provides unlimited cycles with zero capacity degradation over a 25-year design life. This means the batteries can be charged and discharged several times a day. ESS's gigawatt energy storage system can be deployed in months, not years. With energy storage for up to 22 hours, ESS solutions enable intermittent energy to provide baseload power. Honeywell is a major investor.
ESS creates long-duration energy storage (LDES) systems ideal for AI data centers, commercial and industrial facilities, utilities, microgrids and off-grid applications. They utilize an innovative iron-flow flow battery system, that uses natural elements such as iron, salt and water as electrolytes. Iron Flow technology provides unlimited cycles with zero capacity degradation over a 25-year design life. This means the batteries can be charged and discharged several times a day. ESS's gigawatt energy storage system can be deployed in months, not years. With energy storage for up to 22 hours, ESS solutions enable intermittent energy to provide baseload power. Honeywell is a major investor.
8
Funding: $420.1M
EnerVenue provides metal-hydrogen batteries for large-scale renewable and storage applications.
EnerVenue provides metal-hydrogen batteries for large-scale renewable and storage applications.
9
Funding: $390M
Our Next Energy is a developer of innovative energy storage solutions to expand access to sustainable power.
Our Next Energy is a developer of innovative energy storage solutions to expand access to sustainable power.
10
Funding: $360M
Powin Energy is a market leader in the manufacturing and development of energy storage technology used in stationary. Powin buys battery cells and hooks them up with proprietary software controls and ancillary equipment to produce full-fledged power plants. It competes in the upper echelons of the energy storage integration market with the likes of Tesla, Fluence and Wärtsilä.
Powin Energy is a market leader in the manufacturing and development of energy storage technology used in stationary. Powin buys battery cells and hooks them up with proprietary software controls and ancillary equipment to produce full-fledged power plants. It competes in the upper echelons of the energy storage integration market with the likes of Tesla, Fluence and Wärtsilä.
11
Funding: $357.5M
FlexGen designs and integrates storage solutions and the software platform that is enabling today’s energy transition.
FlexGen designs and integrates storage solutions and the software platform that is enabling today’s energy transition.
12
Funding: $262.6M
On.Energy is an energy storage developer that offers AI-powered energy management software and in-house analytics for grid-scale projects.
On.Energy is an energy storage developer that offers AI-powered energy management software and in-house analytics for grid-scale projects.
13
Funding: $222.6M
Ambri develops a liquid battery that will change the world of grid-scale storage systems for solar and wind energy
Ambri develops a liquid battery that will change the world of grid-scale storage systems for solar and wind energy
14
Funding: $220M
Antora Energy is electrifying heavy industry with thermal energy storage for zero-carbon heat and power.
Antora Energy is electrifying heavy industry with thermal energy storage for zero-carbon heat and power.
15
Funding: $130.1M
Nanoramic Laboratories is an industry-leading energy storage technology company & materials solutions innovator for Neocarbonix™ electrodes
Nanoramic Laboratories is an industry-leading energy storage technology company & materials solutions innovator for Neocarbonix™ electrodes
16
Funding: $108.5M
Alphabet Spin-Off Malta uses a heat pump to store electricity in hot molten salts and cold antifreeze liquid, then uses a heat engine to convert the energy back to electricity for the grid; electricity goes in and electricity goes out.
Alphabet Spin-Off Malta uses a heat pump to store electricity in hot molten salts and cold antifreeze liquid, then uses a heat engine to convert the energy back to electricity for the grid; electricity goes in and electricity goes out.
17
Funding: $85.2M
Ion Storage Systems is focused on developing the most energy dense, safest batteries that can be deployed in any environment. Breakthroughs in solid state battery technology have led to a battery that meets the mission critical needs for the defense and aerospace industries; and safer more efficient for consumer electronics and electric vehicles.
Ion Storage Systems is focused on developing the most energy dense, safest batteries that can be deployed in any environment. Breakthroughs in solid state battery technology have led to a battery that meets the mission critical needs for the defense and aerospace industries; and safer more efficient for consumer electronics and electric vehicles.
18
Funding: $65M
Peak Energy is a pioneering firm that is industrializing sodium-ion to expedite the shift to renewable energy.
Peak Energy is a pioneering firm that is industrializing sodium-ion to expedite the shift to renewable energy.
19
Funding: $35.8M
Yotta is developing modular energy storage device designed to reduce cost & expand development of energy storage & solar micro-grids.
Yotta is developing modular energy storage device designed to reduce cost & expand development of energy storage & solar micro-grids.
20
Funding: $31.3M
Quidnet Energy develops long-duration geomechanical energy storage systems. This new form of underground pumped-storage hydroelectric power generation utilizes existing natural resources. Each module is manufactured using traditional drilling processes and standardized hydromechanical energy conversion components. The modules operate within a closed-loop water system designed to prevent energy loss through evaporation. When excess power is available, it is used to pump water from a pond into a borehole, maintaining it under pressure. The borehole is then closed, maintaining the stored energy under pressure for as long as needed. When power is needed, the borehole is opened, allowing the pressurized water to pass through a turbine to generate electricity and return to the pond for the next cycle.
Quidnet Energy develops long-duration geomechanical energy storage systems. This new form of underground pumped-storage hydroelectric power generation utilizes existing natural resources. Each module is manufactured using traditional drilling processes and standardized hydromechanical energy conversion components. The modules operate within a closed-loop water system designed to prevent energy loss through evaporation. When excess power is available, it is used to pump water from a pond into a borehole, maintaining it under pressure. The borehole is then closed, maintaining the stored energy under pressure for as long as needed. When power is needed, the borehole is opened, allowing the pressurized water to pass through a turbine to generate electricity and return to the pond for the next cycle.
21
Funding: $31.2M
Noon Energy is creating multi-day energy storage systems based on reversible solid oxide fuel cells. The system consists of power unit, charging tank (which converts electricity into a carbon-based storage medium, releasing oxygen into the air) and discharging tank (which extracts oxygen from the air to convert the stored energy back into electricity). The company has already demonstrated its battery operating for thousands of hours and claims that the system can operate in discharge mode for up to 200 hours at maximum power. The battery's compact design, according to the company, is 20-200 times smaller in area than other LDES technologies, citing flow batteries and pumped hydroelectric power plants as examples. Noon Energy also claims it uses only about 1% of the critical materials compared to lithium-ion batteries.
Noon Energy is creating multi-day energy storage systems based on reversible solid oxide fuel cells. The system consists of power unit, charging tank (which converts electricity into a carbon-based storage medium, releasing oxygen into the air) and discharging tank (which extracts oxygen from the air to convert the stored energy back into electricity). The company has already demonstrated its battery operating for thousands of hours and claims that the system can operate in discharge mode for up to 200 hours at maximum power. The battery's compact design, according to the company, is 20-200 times smaller in area than other LDES technologies, citing flow batteries and pumped hydroelectric power plants as examples. Noon Energy also claims it uses only about 1% of the critical materials compared to lithium-ion batteries.
22
Funding: $29.3M
GoodPeak is a utility-scale battery energy storage platform that offers energy storage development pipeline.
GoodPeak is a utility-scale battery energy storage platform that offers energy storage development pipeline.
23
Funding: $24.3M
Quino Energy manufactures batteries that uses specially designed reactants called quinones that are dissolved in water.
Quino Energy manufactures batteries that uses specially designed reactants called quinones that are dissolved in water.
24
Funding: $18.1M
Enact’s platform enables remote design, sales proposals and project management for solar storage, as well as improve end-customer engagement
Enact’s platform enables remote design, sales proposals and project management for solar storage, as well as improve end-customer engagement
25
Funding: $17M
Sage combines innovative approaches to heat harvesting with modern oilfield expertise and methodologies to enable geothermal energy anywhere in the world
Sage combines innovative approaches to heat harvesting with modern oilfield expertise and methodologies to enable geothermal energy anywhere in the world
26
Funding: $14M
Tyba was founded to improve energy storage modeling and operating methods, enabling developers, owners, and operators to optimize their assets and realize greater returns.
Tyba was founded to improve energy storage modeling and operating methods, enabling developers, owners, and operators to optimize their assets and realize greater returns.
27
Funding: $11.6M
By engineering a new way to use CO2, and store energy, OCOchem’s technology helps solve the dual challenges of carbon emissions and large-scale zero-carbon energy storage for customers interested in reducing their carbon footprint, energy storage costs, or both.
By engineering a new way to use CO2, and store energy, OCOchem’s technology helps solve the dual challenges of carbon emissions and large-scale zero-carbon energy storage for customers interested in reducing their carbon footprint, energy storage costs, or both.
28
Funding: $10.6M
RePurpose Energy reuses electric vehicle batteries to create lower-cost, more sustainable "second life" solar energy storage systems.
RePurpose Energy reuses electric vehicle batteries to create lower-cost, more sustainable "second life" solar energy storage systems.
29
Advanced Rail Energy Storage (ARES) provides a deployable solution for grid-scale energy storage. ARES mission is to enable the electric grid to integrate unprecedented amounts of clean, environmentally responsible, renewable energy while maintaining the reliable electric service necessary to power growth and prosperity.
30
Funding: $10M
Synop helps turn electric school buses into battery backups for a stressed grid via AI-based, single-platform management service
Synop helps turn electric school buses into battery backups for a stressed grid via AI-based, single-platform management service
31
Funding: $8.5M
Cache Energy is developing energy storage technology that is non-toxic, non-flammable, and a fire retardant for easy transportation.
Cache Energy is developing energy storage technology that is non-toxic, non-flammable, and a fire retardant for easy transportation.
32
Funding: $4.2M
Jolt Energy develops and engineers industry-changing, sustainable energy-storage technologies.
Jolt Energy develops and engineers industry-changing, sustainable energy-storage technologies.
33
Funding: $4.1M
Renewell Energy created a mechatronic conversion system called Artemis Prime as an energy storage solution. This "fancy regenerative winch" aims to take inactive oil and gas wells that leak pollutants and use them for energy storage.
Renewell Energy created a mechatronic conversion system called Artemis Prime as an energy storage solution. This "fancy regenerative winch" aims to take inactive oil and gas wells that leak pollutants and use them for energy storage.
34
Funding: $3.5M
B2U Storage Solutions manufactures battery energy storage systems while unlocking the potential of second life EV Batteries
B2U Storage Solutions manufactures battery energy storage systems while unlocking the potential of second life EV Batteries
36
Funding: $750K
EarthEn, is a grid-scale energy storage solution. The technology can provide short-term — 6 to 8 hours — and long-term — over 100 hours — storage. The EarthEn pods provide a cheaper alternative and are built using 3D printing.
EarthEn, is a grid-scale energy storage solution. The technology can provide short-term — 6 to 8 hours — and long-term — over 100 hours — storage. The EarthEn pods provide a cheaper alternative and are built using 3D printing.
38
Funding: $350K
Dragon Q Energy is developing the world's biggest and safest batteries through the use of pressurization, an angle no one else is taking that provides a vast number of added benefits including power output and cycle life. The technology is not limited to a single battery chemistry, benefits can be seen across current and anticipated chemistries.
Dragon Q Energy is developing the world's biggest and safest batteries through the use of pressurization, an angle no one else is taking that provides a vast number of added benefits including power output and cycle life. The technology is not limited to a single battery chemistry, benefits can be seen across current and anticipated chemistries.
40
PolyJoule offers a less expensive and longer-lasting alternative to lithium-ion batteries for storing electricity from intermittent sources like wind and solar. It's a new type of battery made from electrically conductive polymers—basically plastic.
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