All industries › Battery storage › Oklahoma › Mammoth Plains Energy Storage II
Battery storage · Dewey County, Oklahoma
Mammoth Plains Energy Storage II
A 101 MW battery storage project in Dewey County, Oklahoma. Mammoth Plains Energy Storage II has asked to connect to the grid or filed for its first approvals; nothing on record yet commits money to it. Public records name Mammoth Plains Energy Center, LLC as its developer. No public record read so far names its builder.
The record
What the public record says about Mammoth Plains Energy Storage II, as of 23 Oct 2026.
| Stage | Queued |
|---|---|
| Construction start | Q2 2028 estimate |
| Size | 101 MW |
| Location | Dewey County, Oklahoma (to about 10 km) |
| Developer | Mammoth Plains Energy Center, LLC |
| Grid operator | — |
| Builder (EPC) | Not named yet |
| Trade subcontractors | in the app |
| People to call | in the app |
| Phase windows | in the app |
Every fact in the app links to the public record behind it, with how many records agree and whether it is confirmed, reported or an estimate. What the terms mean.
What happened
Each change dated by the scene or the document, newest first.
No change on record since Groundtrace started tracking it.
Who was named on it, and when, is in the app.
Also in Dewey County
| Project | Stage | Size |
|---|---|---|
| Mammoth Plains Energy StorageBattery storage | Queued | 150 MW |
| Unnamed 42 MW wind projectOnshore wind | Queued | 42 MW |
| Crossroads Wind FarmOnshore wind | Operating | 228 MW |
| Mammoth PlainsOnshore wind | Operating | 226 MW |
| Seiling Wind IOnshore wind | Operating | 199 MW |
| Taloga WindOnshore wind | Operating | 130 MW |
More
Questions
Mammoth Plains Energy Storage II, in short.
Where is Mammoth Plains Energy Storage II?
Mammoth Plains Energy Storage II is a 101 MW battery storage project in Dewey County, Oklahoma. The public page places it to within about ten kilometres; the precise location is in the subscriber record.
When does construction start on Mammoth Plains Energy Storage II?
Groundtrace estimates construction starts in the second quarter of 2028. This is an estimate from the project's filings, not a date any record states; the exact date and the record behind it are in the subscriber record.
Who is developing Mammoth Plains Energy Storage II?
Mammoth Plains Energy Center, LLC, as the public record names it.
Who is building Mammoth Plains Energy Storage II?
No public record read so far names a builder for Mammoth Plains Energy Storage II. Groundtrace leaves the field empty rather than guess, and fills it when a permit, a filing or the builder's own page names one.
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