All industries › Utility solar › Maine › Mousam River Solar
Utility solar · York County, Maine
Mousam River Solar
A 20 MW utility solar project in York County, Maine. Mousam River Solar is built and in service. Public records name Walden Renewables Development LLC as its developer. No public record read so far names its builder.
The record
What the public record says about Mousam River Solar, as of 23 Oct 2026.
| Stage | Operating |
|---|---|
| Construction start | In service since 2025 |
| Size | 20 MW |
| Location | York County, Maine (to about 10 km) |
| Developer | Walden Renewables Development LLC |
| Grid operator | ISO-NE |
| Builder (EPC) | Not named yet |
| Trade subcontractors | in the app |
| People to call | in the app |
| Phase windows | in the app |
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What happened
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No change on record since Groundtrace started tracking it.
Who was named on it, and when, is in the app.
Also developed by Walden Renewables Development LLC
| Project | Stage | Size |
|---|---|---|
| Nutes SolarUtility solar · Strafford County, New Hampshire | Under construction | 20 MW |
Also in York County
| Project | Stage | Size |
|---|---|---|
| GDC Saco SolarUtility solar | Financed | 20 MW |
| Emery Meadow SolarUtility solar | Financed | 16 MW |
| Freedom Pine SolarUtility solar | Queued | 250 MW |
| Sanford SolarUtility solar | Operating | 49 MW |
| Bonny EagleBattery storage | Operating | 8 MW |
| QuarryUtility solar | Operating | 5 MW |
More
Questions
Mousam River Solar, in short.
Where is Mousam River Solar?
Mousam River Solar is a 20 MW utility solar project in York County, Maine, in ISO-NE's interconnection queue. The public page places it to within about ten kilometres; the precise location is in the subscriber record.
When does construction start on Mousam River Solar?
Mousam River Solar is built and in service since 2025.
Who is developing Mousam River Solar?
Walden Renewables Development LLC, as the public record names it.
Who is building Mousam River Solar?
No public record read so far names a builder for Mousam River Solar. 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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