# Diamond Trail Wind Farm

MISO asset profile · https://askthegrid.com/assets/facilities/diamond-trail-wind-farm

## Current generation inventory

EIA plant 63641 · Inventory reporting month: 2026-08.

- wind: 252.5 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): -92.1642, 41.6744
- OSM extract: 2026-10-08T20:21:06Z
- OSM mapped edit: 2022-12-04 14:04:02+00:00
- Map prepared: 2026-10-10T02:28:18.904987+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

Diamond Trail Wind Farm is a 252.5 MW onshore wind turbine plant in Iowa County. Diamond Trail is a 252.5 MW wind farm in Iowa County, Iowa, owned by MidAmerican Energy Company and part of its Wind XII programme. Mortenson built it with a mix of Vestas V110, GE 2.8 and Vestas V136 turbines, plus the transmission line, substation and operations building. It was completed in October 2020 and sells into the MISO market.

## Reviewed metrics

- **Nameplate capacity:** 252.5 MW — Canonical EIA plant baseline.
- **Registry anchor:** Plant 63641 — plant-63641

## Facts

- **Technology:** Onshore Wind Turbine
- **Operator:** MidAmerican Energy Company

## Related parties

- **Owner / operator:** MidAmerican Energy Company — owner ([source](https://www.midamericanenergy.com))
- **EPC contractor / construction contractor:** Mortenson — epc_contractor ([source](https://www.mortenson.com))
- **Equipment supplier:** Vestas — equipment_supplier ([source](https://www.vestas.com))
- **Equipment supplier:** GE — equipment_supplier ([source](https://www.ge.com))

## Sources

- [mortenson.com](https://www.mortenson.com/projects/diamond-trail-wind-project) — mortenson.com · public_source — Source retained for exact-record publication review.

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Canonical page: https://askthegrid.com/assets/facilities/diamond-trail-wind-farm
Website: [MidAmerican Energy Company](https://www.midamericanenergy.com)

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