Sunnyside Solar Energy CenterUnder construction
Dane County, Wisconsin · EIA plant ID 68054 · Operator: Madison Gas & Electric Co
60 MW under construction (Batteries, Solar Photovoltaic), first expected Nov 2026 · EIA-860M
Nameplate—MWSummer — MW
Generators0in service · 60 MW building
Net generation—GWh12 mo
Capacity factor—not meaningful for storage
Heat rate—thermal plants only
First online—
Capacity factor by year
Net MWh ÷ (summer MW × hours), primary-fuel units. Each year uses that year's EIA-860 ratings; the hollow dot is the latest 12 months.
No capacity factor available.
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.
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 |
|---|---|---|---|---|---|---|---|---|
| SNSB | Batteries | BA | 40 | 40 | planned Nov 2026 | Under construction | — | coming soon |
| SNSS | Solar Photovoltaic | PV | 20 | 20 | planned Nov 2026 | Under construction | — | coming soon |
Owner / operator
Operator: Madison Gas & Electric Co. Ownership shares by in-service nameplate MW (EIA-860 Schedule 4; units not listed there are wholly owned by the operator).
Nearby plants
Within 80 km.
| O'Brien Solar Fields | 22 MW | 2.3 km |
| Strix Solar | 6 MW | 3.7 km |
| Fitchburg | 58 MW | 3.8 km |
| Tyto Solar | 6 MW | 4.7 km |
| Nine Springs Solar | — | 7.7 km |
| Nine Springs | 16 MW | 8.7 km |