Eos Energy Enterprises announced a $303.5 million federally guaranteed loan on Dec 3, 2024, to expand aqueous-zinc battery manufacturing in Turtle Creek, Pennsylvania. One automated line was already operating commercially.
The Department of Energy’s Loan Programs Office guarantee initially covers two manufacturing lines. Two further lines require additional programme approvals and an environmental assessment under the National Environmental Policy Act. The final financing is smaller than the earlier conditional commitment, reflecting lower projected operating costs and a separate Cerberus investment, according to Eos. The Turtle Creek expansion combines factory construction, private investment and staged federal funding. Guaranteed borrowings carry Treasury rates plus a 0.375% spread. Eos expected domestic battery-component production credits and customer tax credits for qualifying domestic-content projects.
Building the production equipment
Eos selected ACRO Automation Systems to design, develop and implement high-output manufacturing lines in August 2023. The Wisconsin company specialises in custom automated systems and brought more than 80 years of experience across industries to the partnership. The planned equipment package would contain a majority of equipment made in the United States. At that stage, Eos was still awaiting a decision on a conditional federal loan commitment.
The agreement covered the machinery needed to manufacture Z3 at greater scale. It preceded both final financing and installation of the first automated line at Turtle Creek. Eos, founded in 2008 and then headquartered in Edison, New Jersey, described its Znyth aqueous-zinc technology as serving utility, industrial and commercial storage applications lasting three to 12 hours.
The original AMAZE programme
Eos announced Project AMAZE, short for American Made Zinc Energy, on Aug 31, 2023. The planned $500 million expansion initially targeted 8 GWh of annual production capacity by 2026. A conditional loan guarantee of up to $398.6 million was expected to finance 80% of the expansion if finalised. Technical, legal and financial conditions still had to be satisfied before definitive documents and funding.
Workforce development accompanied the factory proposal. Eos had completed six listening sessions with surrounding Mon Valley communities and committed to work with the Mon Metro Chamber of Commerce on science, technology, engineering and mathematics programmes extending into high school. Its workforce partners included the University of Pittsburgh, Carnegie Mellon University, Partner4Work, the Trade Institute of Pittsburgh and the Community College of Allegheny County. The company anticipated approximately 650 additional jobs once the facility reached full operation. Both that employment forecast and the original capacity deadline belonged to the 2023 programme.
Factory testing before installation
By early May 2024, the first automated line had completed factory acceptance testing. All process stations were functioning as designed, with an initial cycle time of 12 seconds and a target of 10 seconds. Eos and ACRO then had to disassemble the equipment, transport it and install it at Turtle Creek for site acceptance testing. Commissioning remained scheduled for the second quarter.
Eos was already supplying Z3 from semi-automated production. By its May update, it had manufactured and shipped more than 110 Z3 Cubes and nearly 75,000 battery modules to five customers since late September 2023. About 95% of the shipped cubes were on foundations and beginning final customer commissioning. The manufacturing footprint was sized for the first line’s planned 1.25 GWh capacity. Eos was also investing in a proposal to add nearly another gigawatt-hour within the same footprint. Its first-quarter revenue was $6.6 million; the larger automated line was still being prepared for service.
Commercial production and the capacity ramp
Eos announced commercial production on the newly installed line on Jul 1, 2024. Commissioning included validation of mechanical processes, software integration and overall line performance. Chief executive Joe Mastrangelo put installation and commissioning at just over five weeks after factory acceptance testing. ACRO’s factory testing had taken place in Milwaukee before the equipment moved to Pennsylvania.
The next stage was a six-month ramp towards 1.25 GWh of annualised manufacturing capacity, with a further investment proposal to reach 2 GWh on the first line. Eos forecast production costs falling by nearly half at scale through better overhead absorption and variable labour utilisation. Chris Dellinger, senior director of advanced manufacturing, described development progressing from discrete manufacturing through semi-automation to the new line, alongside a new product design and Industry 4.0 integration. Those capacity and cost figures were ramp-up objectives rather than measurements of output already achieved on the announcement date.
Private financing tied to performance
Eos achieved the first four performance milestones attached to Cerberus’s strategic investment by Aug 29, 2024. Meeting those conditions allowed it to draw an additional $30 million under a delayed-draw term loan for operations and production expansion. The milestones covered the automated production line, materials cost reductions, Z3 technical performance and backlog-to-cash conversion.
The company reported cycle times below 10 seconds and performance exceeding first-pass yield targets in the high 90s. These were company-reported manufacturing results. Two further tranches, of $65 million and $40.5 million, remained conditional on performance after testing dates in October 2024 and January 2025. The financing structure released capital against successive operating tests, rather than paying the entire announced investment at the outset.
Orders, deliveries and cash at September’s close
Eos held a $588.9 million backlog at Sep 30, 2024, equivalent to approximately 2.3 GWh, alongside a $14.2 billion commercial pipeline of roughly 59 GWh. Backlog represented expected revenue from existing agreements. Pipeline included technical proposals, nonbinding quotes, letters of intent and firm commitments; it was broader than signed orders and excluded initial lead-generation projects.
A supplier delay affecting enclosures and more manual subassembly work complicated deliveries and raised labour requirements. Eos shifted expected deliveries into the first half of 2025 while working with customers on schedules. For the first nine months of 2024, revenue was $8.35 million, net loss was $417.7 million and operating cash outflow was $111.3 million. Noncash changes in derivative values contributed substantially to the loss. The net-loss figure and operating cash outflow therefore measured different financial effects. Eos’s November update reduced expected full-year revenue to approximately $15 million while keeping its stated backlog intact.
A six-hour municipal order
City Utilities of Springfield, Missouri, agreed to acquire 216 MWh of Eos storage for two sites in November 2024. The specified configuration was 36 MW for six hours. City Utilities served more than 120,000 electric customers, making the project a municipal application for the Z3 technology rather than another factory expansion.
Justin Vagnozzi, Eos’s senior vice president of global sales, described it as the company’s largest municipal order to that date and its first in Missouri. Warren Brooks, City Utilities’ vice president for electric operations, called it the utility’s largest storage investment to date. The planned batteries would support the utility’s expansion and reliability goals. City Utilities intended the storage to help maintain a planning reserve margin above 36% by 2026, alongside its wider expansion of generation capabilities.
Manufacturing beyond the battery module
Eos signed a nonbinding memorandum of understanding with Wabash on Nov 26, 2024. The proposed collaboration covered manufacturing, strategic sourcing, operational capabilities and logistics for complete battery energy storage systems. Wabash’s distribution network and manufacturing expertise were intended to help expand delivery capacity and improve system footprint density.
Wabash chief executive Brent Yeagy identified manufacturing system design, sourcing and logistics as capabilities his company could contribute. The memorandum established a framework for a potential partnership, with a definitive agreement still to be completed. It did not constitute a customer battery order. The proposal addressed how storage systems could be built and distributed around the Z3 module, alongside Eos’s own work on automated module production.
How the federal funding is staged
The December financing announcement linked the guaranteed loan to four planned automated lines and an 8 GWh annual capacity target for 2027. That later target differed from the 2026 deadline in the original AMAZE programme. The facility permits up to four tranches, with funding tied to the construction, start-up and shakedown of individual lines and subject to conditions.
- Each tranche finances 80% of eligible project costs for its associated production line.
- Initial funding was expected within 45 days to reimburse eligible expenditure already paid for the first line.
- Interest is based on Treasury rates, and the facility matures on Jun 15, 2034.
Eos employed more than 250 full-time workers at Turtle Creek at the announcement date. It expected the expansion to maintain or create up to 1,000 temporary and permanent positions. Its workforce plans included apprenticeships involving high schools and trade programmes. Employment expectations remained tied to the expansion rather than a count of additional workers already hired.
Later December commitments and disbursements
Storage for Camp Pendleton
On Dec 18, 2024, International Electric Power placed a 400 MWh standalone storage order for Marine Corps Base Camp Pendleton in San Diego County. The project had partial support from the California Energy Commission’s Long Duration Energy Storage Program. Deliveries were expected to begin in 2025, and the order included a down payment.
The order was Eos’s second agreement and third project with IEP, following a delivery to an IEP project in Texas earlier in 2024. The planned installation used Z3 Cubes. Eos described the cubes as nonflammable and requiring no cooling systems, with associated noise and operating-cost benefits. These product characteristics were company claims. The Camp Pendleton announcement described a contracted future deployment; it did not give evidence that the full 400 MWh installation had entered service.
Integrating controls with FlexGen
Eos and FlexGen signed a joint development agreement announced on Dec 19, 2024. They intended to combine Z3 batteries with FlexGen’s HybridOS energy management system, together with a domestic inverter and transformer package. The proposed integrated solution was aimed at utilities, independent power producers and energy consumers seeking grid-scale or behind-the-meter storage.
The partners identified more than 50 GWh of combined addressable pipeline opportunities. That figure was a joint commercial opportunity, rather than an additional order placed with Eos. Their development work sought to simplify procurement, integration and operation of complete storage projects. FlexGen contributed its energy management software, remote operations capabilities and lifecycle services; Eos contributed the battery technology. The agreement concerned developing and commercialising an integrated offering, with its anticipated customer and operating benefits still prospective.
The first loan payment
Eos received the first $68.3 million advance under the federal loan facility in December 2024. The payment covered 80% of eligible costs incurred to that stage at the Mon Valley Works expansion, including both capital expenditure and project-associated operating expenses. It was the maximum advance permitted under the programme at that point.
Chief financial officer Nathan Kroeker described the payment as supporting further manufacturing expansion and procurement of the second line. He also described the first automated line as operational since June 2024. The first-funding announcement dated Dec 19 thus records money received, distinct from the earlier announcement of the overall guaranteed facility.
A search for another manufacturing location
On Dec 20, 2024, Eos began a search for an additional facility outside Mon Valley Works. Known provisionally as Factory 2 Works, the proposed site would add capacity beyond the Mon Valley expansion under AMAZE. At the same time, Eos was still finalising procurement, construction and implementation schedules for its second production line.
The search criteria included infrastructure near customers, skilled labour and economic incentives. Eos expected replicable production lines and locations closer to demand to support logistics and expansion. Those expectations described its site-selection strategy. The announcement launched a location search and did not identify a selected property, completed building or operating factory.
Software development in 2025
Eos launched DawnOS on Sep 8, 2025, adding a proprietary battery management, software, controls and analytics platform for Z3 systems. Its state-of-charge functions track available energy, state-of-health functions identify and correct battery-string imbalances, and state-of-energy algorithms estimate site-wide energy capacity for dispatch. Distributed controls operate down to individual modules, with automated balancing within strings and between strings in cubes. Chief technology officer Francis Richey connected the development to customer feedback and field operating experience. Pranesh Rao, senior vice president of storage system engineering, described a control system customised to Eos chemistry and applications. Eos planned DawnOS for all new projects and integration into selected existing projects. The company described the platform as domestically developed and hosted, with no external cloud dependency. Those security-related statements were Eos’s product claims. The platform’s monitoring and balancing functions formed a later product-development stage alongside the earlier manufacturing investment.
A further Pennsylvania expansion announced in 2025
Eos announced a $352.9 million investment in October 2025 to expand manufacturing and relocate its headquarters from New Jersey. The plan included leasing an existing 432,000-square-foot building in Marshall Township for additional production lines. A 40,000-square-foot headquarters at Nova Place on Pittsburgh’s North Shore was planned for the latter half of 2026, supporting DawnOS and corporate operations. The project anticipated 735 new jobs and retention of 265 positions. Pennsylvania’s $22 million funding proposal combined a $10 million Pennsylvania First grant and $12 million through the Redevelopment Assistance Capital Program, including $3 million previously awarded in 2022. Allegheny County committed another $2 million. University partnerships, particularly with Carnegie Mellon, would support robotics, computing and engineering skills. These were the investment, employment and relocation plans announced on Oct 21, 2025; their announcement did not establish that the new premises and additional lines were already operating.
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