Leominster (MA)-South Street-R&D
Middlesex County, Massachusetts · EIA plant ID 59745 · Operator: South Street Solar, LLC
Nameplate3MWSummer 3 MW
Generators1in service
Net generation3GWh12 mo to Dec 2025
Capacity factor15%solar units, summer MW
Heat rate—thermal plants only
First online2013
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) |
|---|---|---|---|
| 2015 | 4 | 17.5% | — |
| 2016 | 0.8 | 3.3% | — |
| 2017 | 4 | 17.4% | — |
| 2018 | 3.8 | 16.8% | — |
| 2019 | 3.9 | 17.3% | — |
| 2020 | 3.7 | 16.4% | — |
| 2021 | 3.6 | 15.7% | — |
| 2022 | 3.7 | 16.1% | — |
| 2023 | 2.7 | 11.7% | — |
| 2024 | 3.2 | 14.0% | — |
| 2025 | 3.4 | 14.7% | — |
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 |
|---|---|---|---|---|---|---|---|---|
| 1 | Solar Photovoltaic | PV | 2.9 | 2.6 | Dec 2013 | Operating | — | coming soon |
Owner / operator
Operator: South Street Solar, LLC. Ownership shares by in-service nameplate MW (EIA-860 Schedule 4; units not listed there are wholly owned by the operator).
| South Street Solar, LLC | 100.0% | 3 MW |
Nearby plants
Within 80 km.
| Syncarpha Tewksbury Hybrid CSG | 5 MW | 1.4 km |
| Hewlett-Packard (HP) - Andover, MA | 2 MW | 2.1 km |
| Kearsarge Wilmington | 2 MW | 6 km |
| Shaffer | 5 MW | 6.1 km |
| Iron Horse Solar I CSG | 3 MW | 6.2 km |
| Wilmington Solar | 2 MW | 6.7 km |