Millbrook School
Dutchess County, New York · EIA plant ID 59789 · Operator: SolarCity Corporation
Nameplate1MWSummer 1 MW
Generators1in service
Net generation2GWh12 mo to Dec 2025
Capacity factor14%solar units, summer MW
Heat rate—thermal plants only
First online2015
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 | 1.4 | 14.0% | — |
| 2016 | 1.9 | 15.7% | — |
| 2017 | 1.7 | 13.5% | — |
| 2018 | 1.8 | 14.8% | — |
| 2019 | 1.9 | 15.8% | — |
| 2020 | 2 | 16.2% | — |
| 2021 | 2 | 16.0% | — |
| 2022 | 2 | 16.4% | — |
| 2023 | 1.8 | 14.5% | — |
| 2024 | 1.8 | 14.6% | — |
| 2025 | 1.8 | 14.4% | — |
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 | 1.4 | 1.4 | Mar 2015 | Operating | — | coming soon |
Owner / operator
Operator: SolarCity Corporation. Ownership shares by in-service nameplate MW (EIA-860 Schedule 4; units not listed there are wholly owned by the operator).
| Three Rivers Solar I, LLC | 100.0% | 1 MW |
Nearby plants
Within 80 km.
| Stanford | 5 MW | 7.2 km |
| Fork in the Road Solar | 1 MW | 15.8 km |
| Dover CSG | 2 MW | 18.7 km |
| Cricket Valley Energy | 1,313 MW | 19.1 km |
| Lightstar Renewables - Project 1001 | 4 MW | 22.6 km |
| Union Vale | 2 MW | 22.9 km |