ESS Tech, Inc. (GWH) Stock Analysis and Metrics

ESS Tech

NYSE: GWH

$0.76 ▼ -0.04 (-5.32%)

At close: Jul 24, 2026 · 3:59 PM UTC

Financial Ratios

Market Cap22.34 Mn

P/E-0.35

P/S20.09

Div. Yield0.00

Revenue Growth (1y) (Qtr)-78.63

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About

ESS Tech Inc is a long duration energy storage company that focuses on iron flow battery technology. The firm was founded in 2011 and has developed a battery system that uses an electrolyte of mainly salt iron and water. Its design allows the battery to be charged and discharged for more than twenty thousand cycles with little loss of capacity according to lab tests. The company’s products are built to be safe non flammable and operable in temperatures ranging from minus fifteen degrees Celsius to fifty degrees Celsius. ESS Tech Inc aims to support the shift to zero carbon power by providing long duration storage that can improve grid reliability and enable greater use of renewable energy.

ESS Tech Inc generates revenue from the sale of its energy storage products and related services. Its main product offerings include the Energy Base system which is a modular gigawatt hour scale storage solution the Energy Warehouse and the Energy Center which are earlier generation products. The company also sells core power trains that consist of battery stacks electrolyte management and power electronics which customers can combine with tanks pumps and other balance of system parts to build custom installations. In addition ESS Tech Inc provides warranty maintenance monitoring and field service contracts for the systems it has deployed. Revenue is also derived from licensing of its proprietary technology and from engineering support provided to partners during project development.

ESS Tech Inc holds an early mover position in the long duration energy storage sector where its iron flow technology offers distinct advantages over conventional lithium ion batteries. The company’s chemistry relies on abundant inexpensive materials which reduces material cost and environmental impact while providing a non flammable safety profile. Its batteries are designed to deliver over twenty thousand cycles which translates to a long service life and low levelized cost of storage for applications that need more than eight hours of duration. Compared to lithium ion systems the ESS solution becomes more cost effective as the required storage duration increases because the energy capacity can be expanded by adding electrolyte at low marginal cost. The firm competes with large lithium ion producers such as Contemporary Amperex Technology Co Limited LG Chem Ltd Samsung Electronics Co Ltd Sungrow Power Supply Co Ltd and Tesla Inc. It also faces competition from other storage technologies including vanadium zinc bromine batteries sodium sulfur batteries compressed air hydrogen fuel cells and pumped storage hydro. ESS Tech Inc differentiates itself through its patented Proton Pump which controls hydroxide formation and stabilizes electrolyte pH and through its flexible architecture that separates power rating from energy capacity allowing customers to tailor each installation to specific use cases.

ESS Tech Inc serves utilities independent power producers and commercial and industrial end users. Behind the meter customers include data centers microgrids critical facilities and industrial sites that seek to lower electricity costs integrate renewable generation and improve energy resilience. Front of the meter customers are mainly utilities and independent power producers that deploy the systems for grid balancing peak shaving and firming of renewable output. The company has completed pilot projects with specific customers such as the Sacramento Municipal Utility District and Energy Storage Industries Asia Pacific which have purchased its Energy Warehouse and Energy Base systems for testing and early deployment.

Investment Thesis

▲ Bull case

ESS Tech, Inc. is positioned to capitalize on a structural shift in the energy storage market driven by the accelerating deployment of AI data centers and the growing need for grid resilience, both of which are creating sustained demand for long-duration energy storage (LDES) solutions that lithium-ion batteries cannot efficiently fulfill. The company's iron flow technology, which uses abundant and non-critical materials like iron, salt, and water, offers a 25-year design life with zero capacity degradation, making it inherently more cost-effective over the full lifecycle compared to lithium-ion systems that degrade and require frequent replacement. This technological advantage is underscored by real-world validations such as the successful commissioning of the Turlock Irrigation District solar-over-canal project and the Burbank Water and Power APPA report, both of which confirmed the technology's performance in utility environments and its suitability for grid reliability and renewable integration. These third-party validations de-risk the technology and provide a foundation for broader utility adoption, especially as regulators and grid operators prioritize resilience and domestic supply chain security amid geopolitical tensions and climate-driven grid stress.
The company's recent strategic moves — including the appointment of Drew Buckley as CEO with a background in public-market investing and capital efficiency, Randy Selesky as CCO with deep battery sector experience, and Kate Suhadolnik as CFO — reflect a deliberate leadership reset focused on execution, financial discipline, and commercial scalability. This team has already delivered tangible progress: securing a $9.9 million U.S. Air Force contract for up to 27 MWh of LDES at Clear Space Force Station in Alaska, advancing the 50 MWh Project New Horizon with SRP and Google toward 2027 delivery, and completing the VoltStorage GmbH acquisition to expand IP and talent in iron-salt battery technology. These initiatives are not isolated wins but part of a coherent strategy to build a full-spectrum, non-lithium energy storage platform, further strengthened by the Alsym Energy partnership that adds 8.5 GWh of sodium-ion capacity to address short- and medium-duration markets. Together, these moves transform ESS from a pure-play LDES provider into a diversified, American-made storage solutions provider capable of serving the entire duration curve — a unique positioning that lithium-ion-centric competitors cannot replicate without significant R&D and supply chain reconfiguration.
Financially, ESS has strengthened its balance sheet through a series of disciplined capital raises: a $40 million financing transaction in October 2025, approximately $8.6 million via its ATM program through March 2026, and a $15 million registered direct offering at a premium to market price in January 2026. As of Q1 2026, the company reported $15.5 million in unrestricted cash and $6.0 million in short-term investments, yielding $21.5 million in total liquidity — a significant improvement from prior periods — while reducing operating expenses by 33% year-over-year. This liquidity position, combined with the Wilsonville, Oregon facility's 560 MWh annual manufacturing capacity, provides the runway to execute on its Tier 1 pipeline (SRP, Google, Air Force/CTC) without immediate dilution pressure. Crucially, management has signaled patience with the ATM program, pausing sales to avoid unnecessary dilution, indicating a focus on value-accretive growth rather than desperate cash burn. This financial prudence, coupled with improving adjusted EBITDA trends (from -$71.3M in FY24 to -$44.3M in FY25), suggests the company is approaching an inflection point where operating leverage will kick in as revenue from contracted projects begins to flow in 2026–2027.
The market is likely underestimating the catalytic effect of upcoming milestones in 2026–2027, particularly the commissioning of Project New Horizon (SRP/Google) and the Clear Space Force Station deployment, which will generate the first large-scale, real-world performance data for the Energy Base platform. These projects are not merely pilot programs but de facto reference installations that could trigger follow-on orders from utilities and defense contractors seeking proven, domestically sourced LDES. Additionally, the investor relations upgrade via MZ Group engagement is designed to increase visibility among institutional investors who specialize in industrial decarbonization and infrastructure themes — a cohort that has historically undervalued early-stage industrial tech but rewards execution milestones with significant re-rating. As these projects move from contracting to delivery and commissioning, and as the company begins to recognize revenue from its backlog, the inflection in financials could be sharper than anticipated, especially if the Alsym partnership begins contributing revenue in parallel with the iron flow ramp. The combination of technological differentiation, validated deployments, strengthened leadership, and improving liquidity creates a compelling case for upside that the market has not yet priced in, particularly given the company's low float and high sensitivity to positive news flow.

ESS Tech, Inc. is positioned to capitalize on a structural shift in the energy storage market driven by the accelerating deployment of AI data centers and the growing need for grid resilience, both of which are creating sustained demand for long-duration energy storage (LDES) solutions that lithium-ion batteries cannot efficiently fulfill. The company's iron flow technology, which uses abundant and non-critical materials like iron, salt, and water, offers a 25-year design life with zero capacity degradation, making it inherently more cost-effective over the full lifecycle compared to lithium-ion systems that degrade and require frequent replacement. This technological advantage is underscored by real-world validations such as the successful commissioning of the Turlock Irrigation District solar-over-canal project and the Burbank Water and Power APPA report, both of which confirmed the technology's performance in utility environments and its suitability for grid reliability and renewable integration. These third-party validations de-risk the technology and provide a foundation for broader utility adoption, especially as regulators and grid operators prioritize resilience and domestic supply chain security amid geopolitical tensions and climate-driven grid stress.
The company's recent strategic moves — including the appointment of Drew Buckley as CEO with a background in public-market investing and capital efficiency, Randy Selesky as CCO with deep battery sector experience, and Kate Suhadolnik as CFO — reflect a deliberate leadership reset focused on execution, financial discipline, and commercial scalability. This team has already delivered tangible progress: securing a $9.9 million U.S. Air Force contract for up to 27 MWh of LDES at Clear Space Force Station in Alaska, advancing the 50 MWh Project New Horizon with SRP and Google toward 2027 delivery, and completing the VoltStorage GmbH acquisition to expand IP and talent in iron-salt battery technology. These initiatives are not isolated wins but part of a coherent strategy to build a full-spectrum, non-lithium energy storage platform, further strengthened by the Alsym Energy partnership that adds 8.5 GWh of sodium-ion capacity to address short- and medium-duration markets. Together, these moves transform ESS from a pure-play LDES provider into a diversified, American-made storage solutions provider capable of serving the entire duration curve — a unique positioning that lithium-ion-centric competitors cannot replicate without significant R&D and supply chain reconfiguration.
Financially, ESS has strengthened its balance sheet through a series of disciplined capital raises: a $40 million financing transaction in October 2025, approximately $8.6 million via its ATM program through March 2026, and a $15 million registered direct offering at a premium to market price in January 2026. As of Q1 2026, the company reported $15.5 million in unrestricted cash and $6.0 million in short-term investments, yielding $21.5 million in total liquidity — a significant improvement from prior periods — while reducing operating expenses by 33% year-over-year. This liquidity position, combined with the Wilsonville, Oregon facility's 560 MWh annual manufacturing capacity, provides the runway to execute on its Tier 1 pipeline (SRP, Google, Air Force/CTC) without immediate dilution pressure. Crucially, management has signaled patience with the ATM program, pausing sales to avoid unnecessary dilution, indicating a focus on value-accretive growth rather than desperate cash burn. This financial prudence, coupled with improving adjusted EBITDA trends (from -$71.3M in FY24 to -$44.3M in FY25), suggests the company is approaching an inflection point where operating leverage will kick in as revenue from contracted projects begins to flow in 2026–2027.
The market is likely underestimating the catalytic effect of upcoming milestones in 2026–2027, particularly the commissioning of Project New Horizon (SRP/Google) and the Clear Space Force Station deployment, which will generate the first large-scale, real-world performance data for the Energy Base platform. These projects are not merely pilot programs but de facto reference installations that could trigger follow-on orders from utilities and defense contractors seeking proven, domestically sourced LDES. Additionally, the investor relations upgrade via MZ Group engagement is designed to increase visibility among institutional investors who specialize in industrial decarbonization and infrastructure themes — a cohort that has historically undervalued early-stage industrial tech but rewards execution milestones with significant re-rating. As these projects move from contracting to delivery and commissioning, and as the company begins to recognize revenue from its backlog, the inflection in financials could be sharper than anticipated, especially if the Alsym partnership begins contributing revenue in parallel with the iron flow ramp. The combination of technological differentiation, validated deployments, strengthened leadership, and improving liquidity creates a compelling case for upside that the market has not yet priced in, particularly given the company's low float and high sensitivity to positive news flow.

▼ Bear case

ESS Tech, Inc. continues to operate with significant fundamental flaws that the market may be ignoring, most notably its persistent inability to generate meaningful revenue despite years of development and multiple commercial announcements. In Q1 2026, total revenue was only $128,000 — a figure that represents a 79% decline from the same quarter in 2025 and is effectively negligible relative to the company's operating expenses of $6.7 million. Even for the full year 2025, revenue was just $1.583 million, while operating expenses reached $29.7 million, resulting in a gross loss of $27.672 million. This disconnect between expensive commercial pilots (like the 50 MWh SRP project) and actual revenue generation suggests that the company may be struggling to convert technology validation into paying customer contracts at scale, or that its pricing model is uncompetitive against falling lithium-ion costs and established incumbents. The market may be mistaking contract announcements and press releases for actual commercial traction, when in reality, the company has yet to demonstrate a repeatable, profitable sales cycle.
The company's reliance on non-GAAP metrics like Adjusted EBITDA obscures the severity of its underlying financial deterioration, as GAAP net losses remain substantial and worsening in absolute terms despite improvements in the adjusted figure. In FY25, GAAP net loss was $63.44 million, and in Q1 2026, it was $15.922 million — both figures reflecting real economic erosion of shareholder value. The improvement in Adjusted EBITDA (from -$71.333M to -$44.285M year-over-year) is largely driven by reducing stock-based compensation (down from $11.575M to $5.434M) and lower interest expense, not by operational profitability or revenue growth. This suggests that the company is managing its losses through accounting choices and cost-cutting rather than building a sustainable business. Furthermore, the $15 million registered direct offering at a premium and the $40 million financing transaction, while improving liquidity, have significantly increased share count — from 11.9 million shares outstanding at the end of 2024 to 27.9 million by Q1 2026 — implying substantial dilution that will require far higher future earnings just to maintain flat per-share value.
ESS remains deeply dependent on external capital to survive, and its ability to raise funds on favorable terms is far from guaranteed, especially as macroeconomic conditions tighten and investor appetite for speculative, pre-revenue industrial tech wanes. The company's history of losses, lack of profitability, and early-stage commercialization status are repeatedly cited in its own forward-looking statements as material risks, yet the recent leadership changes and capital raises may be creating a false sense of security among investors. The promissory note with YA II PN, though partially repaid, still leaves $5.6 million outstanding as of December 2025, and the company's financing obligations (current and non-current) totaled over $18 million as of Q1 2026 — a significant burden for a firm generating negligible revenue. If the expected projects (SRP, Google, Air Force) face delays — which is common in utility and defense contracting — or if the Alsym partnership fails to yield near-term revenue, the company could quickly burn through its $21.5 million Q1 2026 liquidity position, forcing another dilutive raise or worse. The reliance on government contracts (like the $9.9 million AFRL award) also introduces political and budgetary risk, as defense spending is subject to annual appropriations and shifting priorities.
Technological and competitive risks are material and underappreciated: the iron flow battery technology, while promising in lab and pilot settings, has not been proven at the scale or duration necessary to displace lithium-ion in mainstream grid applications, and the company admits its products are in the "early stage of commercialization" with aspects "not having been fully field tested." The VoltStorage acquisition, while intended to enhance flexibility, integrates a technology (iron-salt) that is less mature than ESS's core iron flow platform and may divert focus or resources without guaranteed synergies. Meanwhile, the Alsym partnership, though strategically intriguing, adds complexity and execution risk — integrating a wholly different battery chemistry (sodium-ion) with different manufacturing, supply chain, and performance characteristics — into a company that has yet to master its own core technology at scale. Lithium-ion prices continue to fall, and new entrants in LDES (such as Form Energy, Invinity, and others) are advancing rapidly with their own chemistries and significant backing. ESS's American-made, non-lithium advantage may be eroded if competitors achieve similar domestic sourcing or if tariffs and supply chain policies shift. Without a clear, defensible cost or performance edge at scale, the company risks being trapped in a cycle of pilot projects and grants without ever achieving meaningful commercial velocity or profitability.

ESS Tech, Inc. continues to operate with significant fundamental flaws that the market may be ignoring, most notably its persistent inability to generate meaningful revenue despite years of development and multiple commercial announcements. In Q1 2026, total revenue was only $128,000 — a figure that represents a 79% decline from the same quarter in 2025 and is effectively negligible relative to the company's operating expenses of $6.7 million. Even for the full year 2025, revenue was just $1.583 million, while operating expenses reached $29.7 million, resulting in a gross loss of $27.672 million. This disconnect between expensive commercial pilots (like the 50 MWh SRP project) and actual revenue generation suggests that the company may be struggling to convert technology validation into paying customer contracts at scale, or that its pricing model is uncompetitive against falling lithium-ion costs and established incumbents. The market may be mistaking contract announcements and press releases for actual commercial traction, when in reality, the company has yet to demonstrate a repeatable, profitable sales cycle.
The company's reliance on non-GAAP metrics like Adjusted EBITDA obscures the severity of its underlying financial deterioration, as GAAP net losses remain substantial and worsening in absolute terms despite improvements in the adjusted figure. In FY25, GAAP net loss was $63.44 million, and in Q1 2026, it was $15.922 million — both figures reflecting real economic erosion of shareholder value. The improvement in Adjusted EBITDA (from -$71.333M to -$44.285M year-over-year) is largely driven by reducing stock-based compensation (down from $11.575M to $5.434M) and lower interest expense, not by operational profitability or revenue growth. This suggests that the company is managing its losses through accounting choices and cost-cutting rather than building a sustainable business. Furthermore, the $15 million registered direct offering at a premium and the $40 million financing transaction, while improving liquidity, have significantly increased share count — from 11.9 million shares outstanding at the end of 2024 to 27.9 million by Q1 2026 — implying substantial dilution that will require far higher future earnings just to maintain flat per-share value.
ESS remains deeply dependent on external capital to survive, and its ability to raise funds on favorable terms is far from guaranteed, especially as macroeconomic conditions tighten and investor appetite for speculative, pre-revenue industrial tech wanes. The company's history of losses, lack of profitability, and early-stage commercialization status are repeatedly cited in its own forward-looking statements as material risks, yet the recent leadership changes and capital raises may be creating a false sense of security among investors. The promissory note with YA II PN, though partially repaid, still leaves $5.6 million outstanding as of December 2025, and the company's financing obligations (current and non-current) totaled over $18 million as of Q1 2026 — a significant burden for a firm generating negligible revenue. If the expected projects (SRP, Google, Air Force) face delays — which is common in utility and defense contracting — or if the Alsym partnership fails to yield near-term revenue, the company could quickly burn through its $21.5 million Q1 2026 liquidity position, forcing another dilutive raise or worse. The reliance on government contracts (like the $9.9 million AFRL award) also introduces political and budgetary risk, as defense spending is subject to annual appropriations and shifting priorities.
Technological and competitive risks are material and underappreciated: the iron flow battery technology, while promising in lab and pilot settings, has not been proven at the scale or duration necessary to displace lithium-ion in mainstream grid applications, and the company admits its products are in the "early stage of commercialization" with aspects "not having been fully field tested." The VoltStorage acquisition, while intended to enhance flexibility, integrates a technology (iron-salt) that is less mature than ESS's core iron flow platform and may divert focus or resources without guaranteed synergies. Meanwhile, the Alsym partnership, though strategically intriguing, adds complexity and execution risk — integrating a wholly different battery chemistry (sodium-ion) with different manufacturing, supply chain, and performance characteristics — into a company that has yet to master its own core technology at scale. Lithium-ion prices continue to fall, and new entrants in LDES (such as Form Energy, Invinity, and others) are advancing rapidly with their own chemistries and significant backing. ESS's American-made, non-lithium advantage may be eroded if competitors achieve similar domestic sourcing or if tariffs and supply chain policies shift. Without a clear, defensible cost or performance edge at scale, the company risks being trapped in a cycle of pilot projects and grants without ever achieving meaningful commercial velocity or profitability.

Concentration Risk Benchmark Breakdown of Revenue (2025)

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Investment Thesis

Product and Service Breakdown of Revenue (2025)

Concentration Risk Benchmark Breakdown of Revenue (2025)

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Investment Thesis

Product and Service Breakdown of Revenue (2025)

Concentration Risk Benchmark Breakdown of Revenue (2025)

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