# RockGen Energy Center

MISO asset profile · https://askthegrid.com/assets/facilities/rockgen-energy-center

## Current generation inventory

EIA plant 55391 · Inventory reporting month: 2026-08.

- natural gas: 561 MW operating nameplate
- Capacity basis: operating_generator_nameplate_mw
- Source inventory: [EIA-860M workbook (preliminary)](https://www.eia.gov/electricity/data/eia860m/xls/august_generator2026.xlsx)
- Inventory retrieved: 2026-10-10T02:12:40.665346+00:00
- Filed coordinate (longitude, latitude): -89.0492, 42.9767
- OSM extract: 2026-10-08T20:21:06Z
- OSM mapped edit: 2022-08-04 17:39:56+00:00
- Map prepared: 2026-10-10T02:28:21.732016+00:00

Battery power (MW) and stored energy (MWh) are separate measures. Shared physical-site membership does not establish electrical connectivity, settlement or a common export limit.

## Reviewed overview

RockGen Energy Center is a 503 MW natural gas power plant in Cambridge, Wisconsin, owned by Dairyland Power Cooperative. Operational since 2001, it is a simple-cycle, dual fuel facility that runs mainly on natural gas, with three 168 MW low-NOx combustion turbines that ramp quickly to support wind and solar. Dairyland bought it from an affiliate of Starwood Energy Group Global, finalizing the purchase on December 15, 2021, after closing its coal-fired Genoa Station #3.

## Reviewed metrics

- **Nameplate capacity:** 561 MW — Canonical EIA plant baseline.
- **Registry anchor:** Plant 55391 — plant-55391

## Facts

- **Technology:** Natural Gas Fired Combustion Turbine
- **Operator:** Dairyland Power Coop

## Related parties

- **Owner / acquirer:** Dairyland Power Cooperative — owner ([source](https://dairylandpower.com))

## Sources

- [dairylandpower.com](https://dairylandpower.com/dairyland-acquires-rockgen-energy-center) — dairylandpower.com · public_source — Source retained for exact-record publication review.

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Canonical page: https://askthegrid.com/assets/facilities/rockgen-energy-center
Website: [Dairyland Power Cooperative](https://dairylandpower.com)

Source: Ask the Grid — https://askthegrid.com/