Merck - Upper Gwynedd Solar Array
Montgomery County, Pennsylvania · EIA plant ID 61198 · Operator: Merck - Upper Gwynedd Solar Array
Nameplate2MWSummer 2 MW
Generators1in service
Net generation2GWh12 mo to Dec 2025
Capacity factor12%solar units, summer MW
Heat rate—thermal plants only
First online2011
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) |
|---|---|---|---|
| 2016 | 1.8 | 13.4% | — |
| 2017 | 1.6 | 12.0% | — |
| 2018 | 1.4 | 10.6% | — |
| 2019 | 0.8 | 5.9% | — |
| 2020 | 0 | 0.0% | — |
| 2021 | 0 | 0.0% | — |
| 2022 | 1.5 | 11.3% | — |
| 2023 | 1.8 | 14.0% | — |
| 2024 | 1.6 | 12.2% | — |
| 2025 | 1.6 | 12.1% | — |
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 |
|---|---|---|---|---|---|---|---|---|
| SA-1 | Solar Photovoltaic | PV | 1.5 | 1.5 | Jan 2011 | Operating | — | coming soon |
Owner / operator
Operator: Merck - Upper Gwynedd Solar Array. Ownership shares by in-service nameplate MW (EIA-860 Schedule 4; units not listed there are wholly owned by the operator).
| Merck - Upper Gwynedd Solar Array | 100.0% | 2 MW |
Nearby plants
Within 80 km.
| West Point (PA) | 91 MW | 1.4 km |
| North Wales Diesel | retired | 3.1 km |
| Spring House | 4 MW | 5.4 km |
| Hatfield PA BTM | 3 MW | 6.7 km |
| 500 Virginia Solar | 1 MW | 11.5 km |
| Covanta Plymouth Renewable Energy | 32 MW | 13.4 km |