Coverage of a new long-duration battery energy storage system at the University of Minnesota Morris is converging on four questions utilities are now asking: Which chemistry fits the use case? How will the asset behave in real operating conditions? What can it teach the industry? And who will control it when grid needs change?
The 1 MW / 6 MWh Eos Z3™ system will use non-lithium, aqueous zinc chemistry and is expected to be commissioned in 2027. It will be Otter Tail Power Company’s first battery energy storage project and will operate as part of the utility’s electrical system. UMN Morris will receive dedicated research periods over the project’s anticipated 20-year life to study performance under different operating scenarios.
OATI’s microgrid and distributed energy resource controls and software platform, GridMind®, will manage and optimize charging and discharging based on grid conditions and utility needs, giving Otter Tail Power real-time operational control. OATI has also served as a partner and advisor since the project’s earliest stages, including helping develop its original scope. Funding was provided by the Minnesota Environment and Natural Resources Trust Fund, as recommended by the Legislative-Citizen Commission on Minnesota Resources. Read OATI’s full project announcement.
Four outlets, four useful angles
Energy Storage News placed the UMN Morris project inside a wider story about distributed battery energy storage becoming critical local infrastructure as U.S. reliability risks rise. By examining deployments in rural California, remote Alaskan communities, and Minnesota, the outlet moved the discussion beyond megawatts and toward where localized storage can solve reliability problems that large grid projects may not address quickly. It also connected the Morris project to another OATI GridMind®-managed zinc deployment with the Paskenta Band of Nomlaki Indians in Northern California.
Batteries & Energy Storage Technology (BEST) centered its coverage on the technology selection: a six-hour Eos zinc system for Otter Tail Power’s first BESS. That framing matters because the utility is not simply adding another lithium-ion asset. It is evaluating a non-flammable chemistry designed for frequent cycling, minimal degradation over time, and operation across Minnesota’s demanding seasonal temperature range without extensive thermal management.
Solar Power World focused on the campus as a credible real-world proving ground. UMN Morris already generates more than 60% of its daily electricity needs from on-site wind and solar and operates a diverse portfolio that includes lithium-ion storage and agrivoltaics. With nearly one million square feet of buildings, roughly 1,500 people on campus each day, and residential, academic, and operational loads, the campus behaves more like a small community than a controlled laboratory. That makes the research relevant to other Minnesota communities considering long-duration storage.
Fergus Now covered Otter Tail Power’s separate proposed 75 MW / 300 MWh Hoot Lake battery project, a four-hour lithium iron phosphate system planned near the Hoot Lake Solar site. Its brief reference to the UMN Morris partnership is useful because it places the demonstration within a broader utility storage strategy. The two projects are not interchangeable: Hoot Lake is a large regional resource entering permitting and regulatory review, while Morris is an approved six-hour zinc demonstration built around utility operation, applied research, and public education.
The battery matters. How it is operated matters more.
The UMN Morris project is more than a chemistry trial. It is an operating-model trial. The value will come from connecting battery performance to real dispatch decisions: when the system charges, when it discharges, what grid condition triggers the response, and how those choices affect reliability, renewable integration, and asset life.
That is the role of OATI GridMind®. The platform continuously coordinates batteries and other distributed energy resources, allowing operators to adapt control sequences and grid-support functions as conditions change. OATI’s battery storage investment playbook explores the same issue at portfolio scale: how intelligent orchestration can turn storage from installed capacity into a dispatchable grid resource with multiple reliability and economic value streams.
Taken together, the coverage shows the storage market moving past announcements about battery size alone. The harder and more important question is whether utilities can control these assets in real time, learn from their operation, and capture more value throughout their useful lives. Learn how OATI, Otter Tail Power, and UMN Morris are putting that model to work.