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Eos Energy Honors Outgoing Chair Russ Stidolph and Appoints Joseph Nigro as New Chair

Eos Energy Enterprises (EOSE) | Dec. 22, 2025

By Yara Phillips

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Eos Energy Enterprises, Inc. honors outgoing Chair Russ Stidolph for his leadership and investment in the company.

Joseph Nigro, an industry veteran, appointed as the new Chair of the Board of Directors.

Russ Stidolph steps down from the Board to focus on AltEnergy Acquisition Corp, effective December 31, 2025.

Joseph Nigro to succeed Stidolph as the non-executive Chair starting January 1, 2026.

Russ Stidolph's Contribution

Played a crucial role in Eos' evolution from early-stage R&D to a scaled leader in energy storage.

Joseph Nigro's Background

Brings over three decades of global energy and infrastructure experience to the role.

Eos Growth and Accomplishments

Successfully deployed over 5 GWh of energy storage operations and established a U.S. manufacturing strategy.

  • Transition in leadership marks a pivotal phase for Eos Energy Enterprises.
  • Joseph Nigro's expertise expected to drive strategic direction and operational execution at a crucial stage of growth.

Eos Energy Enterprises undergoes a significant leadership shift with the outgoing Chair's departure and the appointment of Joseph Nigro, setting the stage for continued growth and innovation in energy storage solutions.