Energy Vault to deliver dual four-hour battery storage projects for 300 MWh to Michigan

Energy Vault has announced it has signed a contract with Michigan utility Consumers Energy to deliver two battery energy storage systems (BESS) totaling 75 MW / 300 MWh. The projects mark Energy Vault’s entry into the Eastern US utility market, as the company expands its B-VAULT battery portfolio across new regions.

The deal includes a 45 MW / 180 MWh BESS at the former site of the John C. Weadock coal plant in Bay County’s Hampton Township, and a 30 MW / 120 MWh project in Oscoda Township, Iosco County. Battery deliveries are scheduled to begin in the fourth quarter of 2025, with construction expected to start in early 2026. Both projects aim to enter commercial operation by the end of 2026.

According to Energy Vault, the systems will be designed for daily cycling and are intended to dispatch stored renewable energy during peak demand periods. The company said both installations are moving through local permitting processes.

“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,” said Marco Terruzzin, chief revenue officer, Energy Vault.

“This contract marks Energy Vault’s continued expansion across the US with a leading Midwest utility partner committed to delivering sustainable energy at scale—and it lays the foundation for a long-term strategic partnership focused on enabling a more resilient and sustainable energy future for Michigan and beyond.”

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

The projects will use Energy Vault’s X-Vault integration platform and Vault-OS energy management system, and are part of the company’s broader portfolio now exceeding 2 GWh in deployed or developing BESS capacity.

The company recently added a 100 MW/200 MWh BESS in the Electric Reliability Council of Texas (ERCOT) region with a deal with Jupiter Power, which already followed on from the completion of an initial 100 MW/200 MWh BESS in July 2024.

Energy Vault also closed on $18 Million of project financing for the Cross Trials BESS in ERCOT in the past week.