# Maple Flats

MISO asset profile · https://askthegrid.com/assets/facilities/maple-flats

## Current generation inventory

EIA plant 66191 · Inventory reporting month: 2026-08.

- solar: 250 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): -88.54686, 38.748461
- OSM extract: 2026-10-08T20:21:06Z
- OSM mapped edit: 2026-01-06 13:45:14+00:00
- Map prepared: 2026-10-10T02:28:24.574671+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

Maple Flats Solar Energy Center is a 250 MW solar project in Clay County, Illinois, developed by Invenergy. It covers 1,500 acres with 800,000 solar panels, and its output is sold under a long-term power purchase agreement with a Fortune 100 company. In October 2022 WEC Energy Group agreed to acquire an 80% ownership interest for about $360 million, its first solar investment in its Infrastructure segment, subject to regulatory approvals.

## Reviewed metrics

- **Nameplate capacity:** 250 MW — Canonical EIA plant baseline.
- **Registry anchor:** Plant 66191 — plant-66191

## Facts

- **Technology:** Solar Photovoltaic
- **Operator:** Invenergy Services LLC

## Sources

- [energytech.com](https://energytech.com/renewables/article/21253953/wisconsin-utility-acquires-majority-control-of-illinois-solar-energy-project) — energytech.com · public_source — Source retained for exact-record publication review.
- [solarbuildermag.com](https://solarbuildermag.com/news/wec-energy-makes-first-solar-investment-acquiring-piece-of-maple-flats-solar-energy-center/) — solarbuildermag.com · public_source — Source retained for exact-record publication review.

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Canonical page: https://askthegrid.com/assets/facilities/maple-flats

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