Michigan Public Service Commission Clears Path for Massive Battery Storage Expansion
The Michigan Public Service Commission (MPSC) approved a historic six-contract battery energy storage system (BESS) portfolio for DTE Electric Co. on March 27, 2026, totaling 1,332 megawatts (MW) of capacity. The approval advances Michigan's energy transition while simultaneously supporting the state's largest AI data center project.
The portfolio represents one of the largest single-day storage approvals in Michigan's history and brings DTE Electric's total utility-scale storage capacity to 2,606 MW, positioning the utility among national leaders in grid-scale energy storage.
Two-Part Portfolio Serves Grid and High-Demand Needs
The six approved projects are structured into two distinct categories:
Grid Reliability Projects (1,000 MW)
Approved under Docket U-21193, these projects address system stability and renewable energy integration across Michigan:
- 450 MW Big Mitten Energy Center (Huron County) — Features a 20-year tolling agreement with an independent developer
- 350 MW Monroe I Energy Center (Monroe County) — DTE-owned and operated self-build contract
- 200 MW Fermi Energy Center (Monroe County) — DTE-owned and operated self-build contract
These three projects will deliver a combined 1,000 MW of capacity to fulfill DTE Electric's obligations under its 2023 approved integrated resource plan (IRP). The settlement agreement identified at least an 850 MW need for energy storage projects to meet the company's electric capacity requirements.
The Big Mitten Energy Center includes a 20-year tolling agreement, while the Fermi and Monroe I projects are self-build contracts that DTE Electric will develop, own, and operate. These assets store excess renewable generation and discharge during peak periods, helping balance supply and demand across Michigan's grid.
Data Center Support Projects (332 MW)
The remaining three contracts are directly linked to the 1,383 MW AI data center being developed by Green Chile Ventures LLC, a wholly-owned subsidiary of Oracle, in Washtenaw County's Saline Township:
- 132 MW Fish Creek Energy Center
- 100 MW Cold Creek Energy Center
- 100 MW Pine River Energy Center
Approved under Docket U-21990, these projects will serve the massive data center's power needs while allowing DTE Electric to improve grid reliability and drive down costs for customers. The MPSC originally approved the data center application on December 18, 2025, imposing mandatory safeguards to prevent residential and other customers from subsidizing the project.
Oracle Bears All Costs for Data Center Batteries
Under the terms of the data center approval, Green Chile Ventures will bear 100% of the construction and operating costs for the 1,383 MW of company-owned energy storage facilities required to match the data center's contracted demand. The 332 MW approved today represents the first portion of this commitment.
This structure was specifically designed to prevent residential ratepayers from subsidizing the project. The data center battery storage projects will be developed, owned, and operated by DTE Electric, while Green Chile Ventures will receive the value of any market revenues from operating the facilities in the wholesale market.
The 332 MW capacity approved for the data center project exceeds the capacity of DTE Electric's 1,150 MW Blue Water Energy Center, the most recent natural gas-fired plant built in Michigan, which the MPSC approved in 2018.
Long-Term Protections for Ratepayers
The approval includes robust contractual protections designed to safeguard Michigan consumers:
- 15-year Energy Storage Agreement — Green Chile Ventures must pay for the storage facilities over this period
- Minimum billing demand of 80% — Requires the data center to pay a minimum of 80% of its contracted electric use even if actual use is lower
- Termination payment — Up to 10 years' worth of minimum billing demand if the facility stops operating before its contracted date
These protections were baked into the original special contracts MPSC approved in December 2025 and were not reopened or modified when the Attorney General and others petitioned for a rehearing.
Attorney General Challenge Denied
The MPSC denied petitions for and motions to reopen proceedings on its approval of special contracts for DTE Electric to provide electric service for the Washtenaw County data center. The Commission determined that the Attorney General and other petitioners lacked standing to do so and failed to identify any errors, new evidence, facts, circumstances that emerged after the hearing, or unforeseen consequences from the MPSC's order.
In a statement, the MPSC emphasized that "The Commission's initial approval of the data center included the nation's strongest protections to prevent other customers from having to pay the data center's cost. Those protections include the utility agreeing to be responsible for costs it is unable to recover from Green Chile Ventures."
Strategic Implications for Michigan
The 1.3 GW portfolio highlights several key developments in Michigan's energy and infrastructure landscape:
- Grid Modernization Leadership — By pairing large-scale batteries with renewable energy and high-demand infrastructure, DTE is enhancing system reliability and resilience while integrating clean energy sources.
- AI Infrastructure Growth — The approval supports Michigan's emerging position as a hub for artificial intelligence and data processing, with the Oracle campus representing a $16 billion investment in the state.
- Economic Development — The data center project brings significant jobs and economic activity to Washtenaw County, while the broader storage portfolio creates construction and long-term operational opportunities across Michigan.
- Energy Transition Acceleration — The approved storage projects enable greater integration of solar and wind generation, supporting the IRP's goal of adding 15,000 MW of renewable energy in Michigan.
Broader Context
The MPSC's battery storage approvals come amid national debate over data centers and their impact on electricity rates. The White House recently revealed its Ratepayer Protection Pledge, signed by major tech companies including Amazon, Google, Meta, Microsoft, OpenAI, Oracle, and xAI. The pledge commits these companies to develop, deploy, or purchase new generation resources and to cover all costs for upgrading power delivery infrastructure at their data centers.
Michigan's approach demonstrates how states can balance supporting high-growth infrastructure like AI data centers with protecting consumers from rate increases. The contractual structure ensures that the data center bears the costs, while the broader storage portfolio benefits the entire grid.
What's Next
With this approval, DTE Electric's total storage capacity reaches 2,606 MW, among the largest utility energy storage portfolios in the country. The portfolio's combination of grid reliability assets and data center support facilities represents a new model of coordinated energy and digital infrastructure planning.
The projects will move forward with construction, advancing Michigan's energy transition while supporting the state's economic development goals. The MPSC's decision signals strong regulatory support for both renewable energy integration and Michigan's growing technology sector.
This article is based on information from the MPSC, renewable energy industry sources, and related news reports.