Eos Energy appoints Michelle Buczkowski as Chief Commercial Officer
Eos Energy Enterprises has appointed Michelle Buczkowski as Chief Commercial Officer, effective 24 August 2026. Buczkowski succeeds Nathan Kroeker, who will depart the Pittsburgh-based long-duration energy storage (LDES) developer on 20 October 2026 following a transition period. Sales, business development, government affairs, marketing and communications now fall under her remit.
Buczkowski joins the commercial leadership from the role of Chief Administrative Officer, which she has held since November 2025. In that capacity she is credited with securing a $24 million Pennsylvania state manufacturing grant that backed the company's domestic factory expansion, building the workforce pipeline to staff it, and positioning Eos for inclusion in the US Department of Defense's Golden Dome programme. The company said her relationships with utilities, regulators and federal agencies underpin a meaningful share of its existing commercial pipeline.
The transition
Kroeker, who joined Eos in January 2023 as Chief Financial Officer before moving to the commercial role in 2025, leaves behind a balance sheet substantially rebuilt during his tenure. The company credited him with securing more than $2 billion in capital and financing commitments, including a Cerberus Delayed Draw Term Loan and a Department of Energy loan guarantee, which together funded the company's manufacturing scale-up. He also expanded engagement with utilities, hyperscale data-centre operators and strategic partners, growing Eos's order backlog and opportunity pipeline.
Chief executive Joe Mastrangelo cited Buczkowski's record of translating government relationships into operational outcomes. "She secured the state support behind our factory, built the team that staffs it, and opened the federal channel that led to our Department of War partnership," he said.
Market context
Eos manufactures zinc-based battery energy storage systems (BESS) under its proprietary Znyth chemistry, which the company positions as a non-flammable, non-precious-metal alternative to lithium-ion for utility-scale and commercial applications in the four-to-sixteen-hour discharge range. That discharge window places it squarely in the LDES category, which covers systems capable of eight or more hours of sustained output.
The LDES market is drawing increasing attention from grid operators and hyperscalers seeking firm, dispatchable clean power. Corporate and utility buyers are under pressure to source storage that can be sited and serviced domestically, a preference reinforced by supply-chain provisions in the US Inflation Reduction Act and broader industrial policy momentum toward onshoring critical energy infrastructure. Eos, as a domestic manufacturer, is positioned to benefit from those tailwinds, though the company faces competition from iron-air, flow-battery and thermal-storage developers also pursuing utility-scale contracts.
The appointment of a commercially oriented executive with deep government-affairs experience reflects a broader pattern among pre-revenue or early-revenue LDES developers: converting a pipeline of policy-enabled project opportunities into signed contracts and recognised revenue remains the defining operational challenge. Buczkowski's background at Duquesne Light Company and Consol Energy/CNX Resources, working across regulated utility and energy-production environments, gives her direct familiarity with the procurement processes of the utilities and grid operators that represent Eos's primary customer base.
The near-term milestones to watch are the conversion rate of the company's stated opportunity pipeline into binding orders, the pace of output from the Pennsylvania manufacturing facility, and any further announcements from the Golden Dome programme that could translate into federal procurement volumes.