Maple Flats — Plant Summary
- EIA Plant ID
- 66191
- Capacity
- 250 MW
- Primary Fuel
- Solar
- Technology
- Solar Photovoltaic
- Status
- Operating
- Location
- Clay, IL
- Operating Since
- 2024
- Generators
- 1
- Operator
- Invenergy Services LLC
- Parent Company
- WEC Energy Group
- Annual Generation
- 493,105 MWh
- Capacity Factor
- 22.5%
- Balancing Authority
- Midcontinent Independent Transmission System Operator, Inc..
- ISO/RTO
- MISO
- NERC Region
- SERC
Maple Flats
OperatingSolar
Ranked #5 of 325 Solar plants in IL#222 of 7447 nationally
250 MW Solar operating in Clay, IL — Midcontinent Independent Transmission System Operator, Inc..
EIAGEM
250 MW
Nameplate Capacity
1
Generators
unit
Solar Photovoltaic
Technology
2024
Operating Since
Location
Coordinates
38.7485, -88.5469
County
Clay, IL
Nearby Plants
- Clay FCSolar2 MW · 3.5 km
- Raccoon Creek Energy CenterNatural Gas456 MW · 5.5 km
- Flora Site BDistillate Oil3.6 MW · 9.9 km
Ownership & Operator
Owner data does not fully agree across sources.
EIA typically reports the operating utility, while GEM resolves to the financial owner or parent corporation. Both can be correct.
| Field | EIA | GEM | Wikidata |
|---|---|---|---|
| Operator | Invenergy Services LLC | Invenergy | — |
| Owner(s) | Invenergy Services LLC | WEC Energy Group | — |
| Status | Operating | operating | — |
Ownership Chain
About
Maple Flats is a 250 MW solar photovoltaic power plant located in Clay County, Illinois. The plant began operating in 2024 and has a single generator utilizing single-axis tracking technology. It is owned by WEC Energy Group and operated by Invenergy Services LLC. Maple Flats interconnects to the Midcontinent Independent Transmission System Operator, Inc. (MISO) balancing authority and resides within the SERC NERC region.
In its most recent year of operation, Maple Flats generated 493,105 MWh of electricity, achieving a capacity factor of 22.5%. The plant is ranked as the 5th largest solar facility out of 19 in Illinois, and 140th out of 639 solar facilities nationally. Financial data for the plant is available from LBNL, indicating it is tracked in research on solar power purchase agreements and installed costs.
Generated from EIA, GEM, and public data sources
Engineering & Generators
Grid Context
NERC Region
SERC
Balancing Authority
Midcontinent Independent Transmission System Operator, Inc..
Grid Voltage
138 kV
Regulatory Status
NR
Entity Type
Independent Power Producer
Sector
IPP Non-CHP
Generation
17.9K MWh
Latest Month
493.1K MWh
Annual Generation
22.5%
Capacity Factor
Financial DataBeta
Source: LBNL Utility-Scale SolarHIGH
$41.3/MWh
LCOE (Levelized Cost)
Pricing & Market Data
MEDIUM confidenceMarket Position
ISO/RTO Market
MISO
LMP Node
AMIL.CLAY_1.AZ
Pricing Hub
ILLINOIS.HUB
Location Type
Trading Hub
Node Source
Curated node match
News & Articles (5)Beta
Deals·ppa
Verizon signs four vPPAs with Invenergy for 640MW of power across US
Tied to solar projects in Maryland, Arizona, Illinois, and Ohio.
Verizon (buyer)Invenergy (seller)
Data Center Dynamics·1 years ago
Deals·ppa
Invenergy, Verizon Expand PPAs for Solar Power
Energy major Invenergy and telecom company Verizon are moving forward with power purchase agreements (PPAs) involving 640 MW of solar energy from projects...
Invenergy (seller)Verizon (buyer)
POWER Magazine·1 years ago
Industry·earnings
WEC Energy Group Concentrates on Natural Gas, Solar to Meet Data Center Growth
WEC Energy Group's second-quarter earnings call zeroed in on new natural gas and solar generation to bolster Wisconsin's economic...
WEC Energy Group (operator)
RTO Insider·1 years ago
Deals·project finance
Project Finance Brief: Allianz Capital Partners Acquires 147 MW Solar Project
Allianz Capital Partners, an asset manager, acquired the 147 MW Galloway 2 Solar Project from Avantus (formerly 8minute), an independent solar power developer...
Allianz Capital Partners (lender)Avantus (developer)
Mercom Capital Group·3 years ago
Last updated 2026-03-14
View all 5 articles