U.S.-based energy storage solutions provider Eos Energy Enterprises reported revenue of $58 million in the fourth quarter (Q4) of 2025, up 699.6% year-over-year (YoY) from $7.25 million in the previous year.

The revenue, however, fell short of analysts’ estimate of $95.7 million.

The company attributed the revenue growth to subassembly automation, which represented an inflection point in its manufacturing strategy. It expanded available capacity, improved product consistency and quality, and enhanced labor productivity, ultimately lowering overall unit costs.

The company’s loss narrowed by 55% to $120.45 million in the quarter from$260.23 million in the same period the previous year.

Eos attributed the loss to one isolated supplier’s non-performance, the automated bipolar production’s inability to hit quality targets, taking longer than expected, and its battery line downtime running well above industry norms.

Earnings per share for the quarter decreased 62% to negative $0.84, from negative $2.20 the previous year, but missed analysts’ estimates of $0.54.

On the outlook for 2026, Joe Mastrangelo, Chief Executive Officer at Eos, said, “For 2026, we expect $300 million to come from backlogs, and the $400 million is tied to some of the bigger projects, as they go through the normal approval processes with the grid operators, where our customers will be installing projects. We feel confident that we’ll begin shipping Indensity in the second half of this year. And that’s how we will go from $300 million to $400 million.”

Full Year 2025

Eos Energy’s revenue of $114.203 million in 2025 increased 631.8% from $15.61 million in 2024.

The company’s net loss increased by 41% YoY, from $685.87 million to $969.65 million.

EBITDA loss also increased by 43.5% YoY to $932.18 million from $649.73 million in 2024.

The company’s reported earnings per share increased by 47% for the year, rising to negative $6.69 from negative $4.55 the previous year.

Eos ended the year with a backlog of $701.5 million, booking over $240 million in new orders in the fourth quarter across eight customers and nine projects representing nearly 1.1 GWh of contracted volume. Demand was broad based across commercial and industrial, distributed generation portfolios, and large front of the meter utility scale projects.

Operational Highlights

In 2025, Eos achieved 2 GWh of annualized production capacity through continued automation, subassembly integration, and manufacturing process optimization.

The company launched Eos Indensity, a next-generation stackable energy storage architecture engineered to deliver up to 1 GWh of storage per acre, or roughly four times the density of many incumbent battery technologies.

Indensity applies spatial intelligence configurations to provide both horizontal and vertical site layouts, enhancing site flexibility, safety, and adaptability to meet diverse load profiles. It is a product that the company has co-developed at its Edison test facility.

The company’s active data center pipeline grew by more than 40%. Many of these opportunities are specifically designed for the Indensity solution.

In the fourth quarter, the company signed a 50-MWh master supply agreement with a Midwest developer to deliver projects supported by Commonwealth Edison’s Distributed Generation rebate program. This program provides a $ 250/kWh incentive for new energy storage systems. It has already executed the first purchase order under this agreement, with delivery scheduled for later this year.

Eos Energy also signed two initial projects for systems to be installed at hotels in Florida with a developer that has a pipeline of additional projects, and it expects additional projects to materialize over the next 12 to 18 months.

It also secured an order from a global power company that is a focused renewable and energy storage platform to deliver a Z3 system for installation at a national lab for integration testing.

Eos reported a record revenue of $30.51 million in Q3 2025, a 3,500% YoY increase from $854,000.