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Battery storage · Maricopa County, Arizona
Romero Energy Center II
A 225 MW battery storage project in Maricopa County, Arizona. Romero Energy Center II has work under way on site. Public records name Romero Energy Center II, LLC as its developer. No public record read so far names its builder.
The record
What the public record says about Romero Energy Center II, as of 22 Oct 2026.
| Stage | Under construction |
|---|---|
| Construction start | Q4 2026 estimate |
| Size | 225 MW |
| Location | Maricopa County, Arizona (to about 10 km) |
| Developer | Romero Energy Center II, 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 Maricopa County
| Project | Stage | Size |
|---|---|---|
| Maricopa SolarBattery storage | Under construction | 550 MW |
| APS request Q332Utility solar | Under construction | 350 MW |
| Romero Energy CenterBattery storage | Under construction | 225 MW |
| AgaveBattery storage | Under construction | 150 MW |
| Desert BloomBattery storage | Under construction | 150 MW |
| White Tank Energy StorageBattery storage | Under construction | 100 MW |
More
Questions
Romero Energy Center II, in short.
Where is Romero Energy Center II?
Romero Energy Center II is a 225 MW battery storage project in Maricopa County, Arizona. The public page places it to within about ten kilometres; the precise location is in the subscriber record.
When does construction start on Romero Energy Center II?
Groundtrace estimates construction started in the fourth quarter of 2026. 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 Romero Energy Center II?
Romero Energy Center II, LLC, as the public record names it.
Who is building Romero Energy Center II?
No public record read so far names a builder for Romero Energy Center 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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