All industries › Battery storage › Maine › South Portland ESS
Battery storage · Cumberland County, Maine
South Portland ESS
A 10 MW battery storage project in Cumberland County, Maine. South Portland ESS has its local or state siting approval on file. Public records name South Portland ESS, LLC as its developer. No public record read so far names its builder.
The record
What the public record says about South Portland ESS, as of 22 Oct 2026.
| Stage | Permitted |
|---|---|
| Construction start | Q1 2027 estimate |
| Size | 10 MW |
| Location | Cumberland County, Maine (to about 10 km) |
| Developer | South Portland ESS, 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 Cumberland County
| Project | Stage | Size |
|---|---|---|
| West Baldwin SolarUtility solar | Financed | 17 MW |
| Cross Town Battery StorageBattery storage | Operating | 182 MW |
| William F Wyman HybridBattery storage | Operating | 17 MW |
| Baldwin (ME)Utility solar | Operating | 5 MW |
| BWC Beech Ridge BrookUtility solar | Operating | 5 MW |
| Dynamic - Gray SolarUtility solar | Operating | 5 MW |
More
Questions
South Portland ESS, in short.
Where is South Portland ESS?
South Portland ESS is a 10 MW battery storage project in Cumberland County, Maine. The public page places it to within about ten kilometres; the precise location is in the subscriber record.
When does construction start on South Portland ESS?
Groundtrace estimates construction starts in the first quarter of 2027. 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 South Portland ESS?
South Portland ESS, LLC, as the public record names it.
Who is building South Portland ESS?
No public record read so far names a builder for South Portland ESS. 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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