Mammoth North Solar
Starke County, Indiana · EIA plant ID 65957 · Operator: Mammoth North, LLC
Nameplate400MWSummer 400 MW
Generators1in service
Net generation752GWh12 mo to Aug 2026
Capacity factor21%solar units, summer MW
Heat rate—thermal plants only
First online2024
The 12-month figures include preliminary EIA-923 months, which EIA revises. Final data runs through Dec 2025.
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) |
|---|---|---|---|
| 2024 | 64.7 | 11.1% | — |
| 2025 | 748.3 | 21.4% | — |
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 |
|---|---|---|---|---|---|---|---|---|
| GEN1 | Solar Photovoltaic | PV | 400 | 400 | Nov 2024 | Operating | — | coming soon |
Owner / operator
Operator: Mammoth North, LLC. Ownership shares by in-service nameplate MW (EIA-860 Schedule 4; units not listed there are wholly owned by the operator).
| Mammoth North, LLC | 100.0% | 400 MW |
Nearby plants
Within 80 km.
| Mammoth South Solar Project | — | 12.5 km |
| Mammoth Central II Solar Facility | — | 13.2 km |
| Mammoth Central Solar Project | — | 13.8 km |
| IMPA Winamac Solar Park | 3 MW | 16.7 km |
| Mayapple Solar 1 | — | 17.4 km |
| Dunns Bridge II Solar | 491 MW | 26.3 km |