Eos Energy announces $350M expansion including Pittsburgh HQ for zinc battery operation

Economic development officials have pledged $24 million in public money toward a major expansion of zinc battery company Eos Energy, which plans to add hundreds of jobs and relocate its headquarters to Pittsburgh.

The investment from Pennsylvania and Allegheny County is on top of a $400 million federal loan made in 2023 to Eos Energy.

In turn, Eos will invest more than $350 million for the project.

Eos touts its zinc halide batteries as a safer, cheaper alternative to lithium-ion batteries.

It is expanding its operations with hope that demand for the batteries will continue to increase and that its products will be used to shore up the world’s power grid and provide the storage capacity needed to fuel the artificial intelligence boom.

“We knew immediately that this technology would be a game changer,” Gov. Josh Shapiro said as he announced the deal Tuesday at Eos’ Turtle Creek location.

The state is providing $22 million and Allegheny County is offering up to $2 million to support the expansion of Eos’ leased space in Turtle Creek and addition of a 432,000-square-foot leased space in Marshall.

The county’s contribution is from the Allegheny County Economic Redevelopment Authority, according to spokeswoman Abigail Gardner.

Eos’ headquarters will move from Edison, N.J., to Nova Place on the North Shore.

Eos Energy CEO Joe Mastrangelo knows how to speak Yinzer, as he talks about how the company ended up in "Turtle Crick"
The reason: It was cheap. Eos was a startup. pic.twitter.com/pBrYwGxCwx

— Tom Davidson (@TribDavidson) October 21, 2025

Turtle Creek beginnings

Eos Energy launched its Pittsburgh-area operations in 2019, renting affordable space in Turtle Creek at a sprawling former Westinghouse plant that’s now an industrial park, Eos CEO Joe Mastrangelo said.

A U.S. Department of Energy loan allowed the company to expand its footprint in Turtle Creek.

On Tuesday, political and economic development leaders rallied around Mastrangelo and touted zinc-halide batteries as one of the things that will power the future in Pittsburgh and the world.

Mastrangelo, a New Yorker, was an executive for affiliates at General Electric before he joined Eos in 2019. The burgeoning company had been in business just over 10 years then. Mastrangelo chronicled its growth by blogging.

The company had two employees in Turtle Creek then, according to Mastrangelo.

Now it employs 280 people, a number that will top 1,000 after the expansion, which will take place over the next year or so, he said.

‘Great workforce here’

After working here for six years, Mastrangelo sounds like he’s become a part of the region as he says “Turtle Crick” and “Dahntahn” without a trace any New York airs.

If affordability lured Eos to the region, the people here are why it’s staying and putting its headquarters here, Mastrangelo said.

“We have a great workforce. They’ve got that championship mettle that’s been forged over decades,” Mastrangelo said, playing to the crowd of Pittsburgh leaders who toasted the news.

Others present included Stefani Pashman, CEO of the Allegheny Conference on Community Development, the region’s lead economic development agency, United Steelworkers District 10 Director Bernie Hall and municipal leaders.

They congratulated each other, complimented Mastrangelo and later gathered during a happy hour at Nova Place to toast the project.

The proximity to Carnegie Mellon University, the University of Pittsburgh and the area’s technology sector also play a part in why Eos wants to be in the area, Mastrangelo said.

Eos’ expansion is an example of the spirit of cooperation among state and local leaders to encourage private development, Allegheny County Executive Sara Innamorato said.

The project was coordinated by Shapiro’s BusinessPA team, which includes Pennsylvania Department of Community and Economic Development Secretary Rick Siger, a Pittsburgh native.

Siger said one of his first phone calls as Pennsylvania’s economic development leader was to Mastrangelo.

“This project delivers on the governor’s commitment to win great projects,” Siger said.

Eos Energy reported $15.6 million in revenue in 2023 that also included losses of $83.3 million, according to its 2024 financial report.

Its stock, traded as EOSE on NASDAQ, closed Tuesday at $16.30 per share, up from $15.01 Monday but down from its intraday high of $17.02.