PITTSBURGH – Eos Energy, the Western Pennsylvania-based energy company that manufactures zinc-based battery storage systems, told the Washington Examiner in an exclusive interview ahead of its announcement that it is launching Eos IndensityTM, a breakthrough architecture designed to transform how energy storage scales for the real world.
Joe Mastrangelo, CEO of Pittsburgh-based Eos, said today marks a turning point for the company and for the future of U.S. energy storage manufacturing.
“When you see the battery here come off the line that is the core, the engine, in the summer we announced the software, which is the brains, now we have Indensity, which is taking this and making it an even safer, scalable package,” he explained.
Mastrangelo explains Indensity redefines battery storage capacity with a compact, stackable, modular design that targets 1 GWh per acre, which is roughly four times that of most other technologies.
The scale is a breakthrough, designed for a forward-looking world where electrification accelerates, AI drives unpredictable demand, and power systems face unprecedented strain. It delivers storage that performs in the field, scales responsibly, and strengthens the backbone of modern economies.
“The three prongs to this is technology differentiated software that optimizes it and then a way to package it that you can optimize the ability to utilize the system,” Mastrangelo explained. “So we can do a gigawatt hour of power in one acre, which is four times what most other competitors can do,” he said.
Mastrangelo said the launch brings Eos another step closer to producing a fully American-made system, boosting the share of U.S.-manufactured components from 90% to 96%. “Where this is important is we can get higher output out of the factory. But the other piece of this is the way we are packaging the product—normally you put these inside of what looks like a shipping container; those shipping containers until recently have come from Mexico for us, well we are now taking the shipping container and we going to move it to Johnstown who is going to start doing those,” he said, describing the company’s push to reshore more of its buildout.
“In short, doing this new Indensity configuration now becomes close to being 100% American-made; we are less than 3%,” he says proudly.
Eos is one of several Rust Belt industries in manufacturing that support President Donald Trump’s tariffs.
Compared with lithium, that difference matters: Lithium systems can’t be stacked the way Eos can because of fire risk, while Eos offers greater operability and can pack more capacity into a smaller footprint.
Where does this fit in American manufacturing? Mastrangelo says the first place is going to be an AI data center. “Then also standalone storage for grid firming. When you look at the agreement that we signed with Talen Energy last year, this would be a product that Talen could use near its traditional power generation to make those assets more efficient because you can co-locate it because, again, you don’t worry about the fire risk,” he explained.
Talen Energy announced last June it was expanding its relationship with Amazon to provide carbon-free energy from Talen’s Susquehanna nuclear power plant to Amazon Web Services data centers in the region.
Three months later, Eos and Talen Energy announced a strategic collaboration to develop energy storage capacity across Pennsylvania, helping meet rising demand and support AI infrastructure using Eos’s American-made Z3 battery technology.
“This fits right down the middle of the Sen, Dave McCormick, Gov Josh Shapiro’s vision for Pennsylvania leading the way on AI and data centers,” he said.
Eos has never positioned itself as a “green tech” company. Instead, it’s an energy firm that works with traditional natural gas and coal-fired power producers, utilizing its technology to enhance the efficiency of their assets.
“So if you think about gas turbines, you only use them about 50% of the time because you can’t manage the load. So what we do is we put one of our systems next to a gas turbine that allows you to operate that system more efficiently. So you burn less gas to get more power, and you use our system to help you do the frequency regulation for the grid,” explained Mastrangelo.
He envisions their new line also supporting micrograms in agriculture. “It is safe to be around livestock, safe to be around crops because of the inherent safety of the system.”
The same applies to factories or any other energy-intensive industry. “So even if you were to think like a refinery or a pipeline, you can co-locate this with the assets that are running at the refinery or the assets that are running along the pipeline,” he said.
Eos has spent nearly a decade building safe, efficient, sustainable zinc-based long-duration energy storage systems in Western Pennsylvania at the former Westinghouse plant in Turtle Creek. In October, Gov. Josh Shapiro toured the robot-filled facility — staffed by MIT and CMU graduates alongside U.S. Steelworkers union members — to announce Eos’s expansion to the northern suburbs of Allegheny County, where the company plans to open an additional plant.
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Mastrangelo joined Eos Energy Storage in 2018, when the company was still in its infancy in the Mon Valley. He said the original plan was to manufacture the batteries in China and ship them back to the United States, but that strategy quickly changed. He decided to move production entirely to the United States, concluding that it would be easier to scale manufacturing in America.
The company will launch Eos IndensityTM on Wednesday at 8:30 a.m. ET.