Emerald Marshfields, LLC
Plymouth County, Massachusetts · EIA plant ID 66427 · Operator: Emerald Marshfield, LLC
Nameplate2MWSummer 2 MW
Generators1in service
Net generation2GWh12 mo to Dec 2025
Capacity factor14%solar units, summer MW
Heat rate—thermal plants only
First online2022
Monthly net generation
EIA-923, all units at the plant. Net of station use; storage can go negative.
FinalPreliminary
Capacity factor by year
Net MWh ÷ (summer MW × hours), solar units. Each year uses that year's EIA-860 ratings; the hollow dot is the latest 12 months.
Heat rate by year
Electric fuel MMBtu × 1000 ÷ net MWh (Btu/kWh, HHV), fossil units only; CT + CA counted as one combined-cycle block.
Heat rate applies to fuel-burning (thermal) units only.
Annual data table
| Year | Net GWh | Capacity factor | Heat rate (Btu/kWh) |
|---|---|---|---|
| 2022 | 2.5 | 175.6% | — |
| 2023 | 2.1 | 12.7% | — |
| 2024 | 2.2 | 13.5% | — |
| 2025 | 2.3 | 13.9% | — |
Generators
EIA-860 (annual) with EIA-860M updates through Sep 2026. EIA-923 reports generation by plant, prime mover and fuel, not by unit, so unit-level output isn't shown.
| Gen ID | Technology | Prime mover | Nameplate MW | Summer MW | Online | Status | Planned retirement | OEM / model |
|---|---|---|---|---|---|---|---|---|
| EMAR1 | Solar Photovoltaic | PV | 1.9 | 1.9 | Dec 2022 | Operating | — | coming soon |
Owner / operator
Operator: Emerald Marshfield, LLC. Ownership shares by in-service nameplate MW (EIA-860 Schedule 4; units not listed there are wholly owned by the operator).
| EG1 PKI Holdings, LLC | 100.0% | 2 MW |
Nearby plants
Within 80 km.
| Marshfield PV | 3 MW | 1.4 km |
| Scituate Wind | 2 MW | 8.5 km |
| Scituate PV | 3 MW | 9 km |
| Onyx - Pembroke Landfill Solar | 2 MW | 9.1 km |
| 342 Circuit | 2 MW | 12.5 km |
| Plympton Lake Street Solar | 2 MW | 13.2 km |