ESS Tech Inc. (NYSE: GWH)

ESS Tech Inc. (NYSE: GWH) develops and manufactures iron flow long-duration energy storage systems designed to provide reliable baseload power. As a manufacturer of iron-based flow batteries, the company targets applications in AI data centers and utility-scale grid support.

Introduction

Founded in 2011 and headquartered in Wilsonville, Oregon, ESS Tech Inc. specializes in sustainable, safe, and cost-effective long-duration energy storage. Its proprietary iron flow technology utilizes readily available iron, salt, and water to deliver flexible storage solutions with up to 22 hours of duration and zero capacity degradation over a 25-year design life. ESS Tech aims to support global decarbonization by integrating intermittent renewable resources into constant power applications.

Corporate Structure

ESS Tech employs between 201 and 500 people, leveraging expertise in electrochemistry, fuel cells, advanced materials, and renewable energy systems. The leadership team consists of executives with backgrounds in engineering and product management who develop strategy and oversee research and development. The company operates manufacturing facilities in the United States and has expanded its market presence into Europe and the Asia-Pacific region through strategic partnerships.

Iron flow battery by Brett Jordan

Recent Developments and News

In June 2025, ESS Tech announced the acquisition of unanticipated capital, allowing the company to avoid a planned workforce reduction and potential shutdown of its Wilsonville, Oregon manufacturing facility. Interim CEO Kelly Goodman stated that this funding supports the transition to its gigawatt-scale Energy Base solution, which decouples power and energy capacity while providing up to 22 hours of storage.
Earlier milestones include:

• January 2025: Launch of the Energy Base product line.
• December 2024: The first Energy Center solution received IEEE 693 seismic resilience rating.
• 2023: Honeywell investment and the initiation of a global collaboration to advance iron flow battery adoption.

Financial and Strategic Analysis

As of July 22, 2025, ESS Tech shares closed at $1.9450, reflecting a 24.68% increase on a volume of 234,411 shares traded. Key financial metrics from Yahoo Finance (as of Q2 2025) are as follows:

• Market capitalization: $12.95 million
• Enterprise value: $1.44 million
• Revenue (ttm): $4.16 million
• Net income (ttm): –$85.94 million (EPS –$7.25)
• Price/Sales: 3.06
• Price/Book: 1.07
• Total cash: $12.8 million
• Total debt/equity: 10.7%

The company maintains a focused balance sheet but continues to report net losses as it scales production. Strategic initiatives include shifting manufacturing toward the Energy Base, a modular system eligible for Inflation Reduction Act production tax credits, and managing operating expenses to extend cash runway.

Market Position and Industry Context

Global demand for long-duration energy storage is influenced by projections that electricity usage from AI data centers will increase by 165% by 2030 and that 8 TW of storage capacity will be necessary by 2040 to meet clean energy goals. ESS Tech’s iron flow systems are noted for their lower lifecycle carbon footprint and safe chemical composition—attributes that may offer advantages over lithium-ion alternatives in certain large-scale, long-duration applications. The U.S. market benefits from domestic sourcing requirements, while expansions in Europe and the Asia-Pacific address new grid reliability needs. Competition includes other developers of flow batteries and emerging storage technologies, while ESS Tech’s 25-year design life and zero degradation cycle profile position it within a specific market niche for durable, long-term storage solutions.

tl;dr

On July 22, 2025, ESS Tech shares increased by 24.68% to $1.9450 after the company secured unexpected capital in June to avoid a manufacturing facility shutdown and to progress its Energy Base rollout. With up to 22 hours of iron flow storage and eligibility for production tax credits, ESS Tech aims to cater to the growing demand from AI data centers and support grid decarbonization targets through 2040. The current focus is on extending cash runway, scaling manufacturing capacity, and converting a developing project pipeline into revenue.