Energy Vault Secures Battery Storage Contract with Consumers Energy in Michigan

Energy Vault has signed a major contract with Consumers Energy, Michigan’s largest energy provider, to deliver two battery energy storage systems (BESS) totaling 75 MW/300 MWh. The projects, located in Iosco and Bay Counties, represent a significant milestone for Energy Vault as it expands its footprint into the Eastern U.S. utility market.

Battery system deliveries are scheduled to begin in Q4 2025, with construction expected in Q1 2026. Both systems are anticipated to be fully operational by Q4 2026. The agreement marks a strategic move to bolster Michigan’s renewable energy infrastructure and support the state's energy transition goals.

One of the systems—a 45 MW/180 MWh BESS—will be built on the site of the former John C. Weadock Power Plant in Hampton Township, while the second, a 30 MW/120 MWh system, will be located in Oscoda Township in Iosco County. Energy Vault is working closely with local township officials to advance the permitting process and ensure smooth project execution.

“As the energy transition accelerates, utilities like Consumers Energy are stepping up to ensure grid reliability while integrating more renewable energy,” said Marco Terruzzin, Chief Revenue Officer at Energy Vault. “We are proud to partner with Michigan’s largest energy provider on these critical projects, which will not only help meet peak demand with energy but also exemplify how advanced storage technologies can support grid resilience at scale.”

Consumers Energy echoed the importance of the partnership. “Battery storage will continue to play a larger role as Consumers Energy meets Michigan’s growing energy needs,” said Sri Maddipati, President of Electric Supply at Consumers Energy. “We’re excited to collaborate with Energy Vault to bring these two projects to life in the communities we serve.”

The projects will utilize Energy Vault’s B-VAULT™ suite, a fully integrated solution featuring the X-Vault™ integration platform and Vault-OS™ Energy Management System. This technology is designed to maximize performance and flexibility through AC- and DC-coupled configurations and compatibility with multiple battery and inverter suppliers.

These systems are engineered to charge and discharge daily and will dispatch stored renewable energy during peak demand hours, improving grid resilience and reducing reliance on fossil fuels.

With more than 2 GWh of energy storage either deployed or in development, Energy Vault continues to scale its commercial operations globally. The Michigan contract not only strengthens its portfolio but also highlights growing utility demand for advanced energy storage to meet renewable integration and decarbonization goals.

Project Highlights

• Client: Consumers Energy, Michigan’s largest energy provider
• Location: Iosco and Bay Counties, Michigan
• System Capacity: 75 MW / 300 MWh
• Project Sites:
  • 45 MW/180 MWh at retired Weadock Power Plant site, Bay County
  • 30 MW/120 MWh in Oscoda Township, Iosco County
• Project Timeline:
  • Battery delivery: Q4 2025
  • Construction start: Q1 2026
  • Commercial operation: Q4 2026

Technology Stack

• B-VAULT™: Integrated battery energy storage solution
• X-Vault™: Integration platform for flexible configurations
• Vault-OS™: Proprietary energy management system
• Benefits: Enhanced peak energy dispatch, grid reliability, modularity, and scalability

Strategic Significance

• Entry into the Eastern U.S. market for Energy Vault
• Long-term collaboration opportunity with a major Midwest utility
• Support for Michigan’s clean energy transition goals

Originally reported by Business Wire.