Iron Horse Solar 4, LLC
Middlesex County, Massachusetts · EIA plant ID 60799 · Operator: Iron Horse Solar 4, LLC
Nameplate5MWSummer 5 MW
Generators1in service
Net generation7GWh12 mo to Dec 2025
Capacity factor18%solar units, summer MW
Heat rate—thermal plants only
First online2017
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) |
|---|---|---|---|
| 2017 | 4.2 | 18.4% | — |
| 2018 | 7 | 17.8% | — |
| 2019 | 7.4 | 18.8% | — |
| 2020 | 7.7 | 19.6% | — |
| 2021 | 7.1 | 17.9% | — |
| 2022 | 8 | 20.4% | — |
| 2023 | 7.4 | 18.7% | — |
| 2024 | 6.9 | 17.4% | — |
| 2025 | 7.1 | 18.0% | — |
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 |
|---|---|---|---|---|---|---|---|---|
| PV1 | Solar Photovoltaic | PV | 4.5 | 4.5 | Jun 2017 | Operating | — | coming soon |
Owner / operator
Operator: Iron Horse Solar 4, LLC. Ownership shares by in-service nameplate MW (EIA-860 Schedule 4; units not listed there are wholly owned by the operator).
| Iron Horse Solar 4, LLC | 100.0% | 5 MW |
Nearby plants
Within 80 km.
| Iron Horse Solar I CSG | 3 MW | 1.2 km |
| Shaffer | 5 MW | 1.8 km |
| Equinix - Billerica | 2 MW | 4.9 km |
| Syncarpha Tewksbury Hybrid CSG | 5 MW | 6.9 km |
| Tanner Street Generation | retired | 7.2 km |
| Leominster (MA)-South Street-R&D | 3 MW | 7.4 km |