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200 MW Solar under construction in Mayes, OK — Southwest Power Pool
200 MW
Nameplate Capacity
1
Generators
unit
Solar Photovoltaic
Technology
—
Operating Since
Coordinates
36.3316, -95.2293
County
Mayes, OK
Nearby Plants
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 | Leeward Asset Management, LLC | Leeward Energy | — |
| Owner(s) | Leeward Asset Management, LLC | Leeward Energy | — |
| Status | Under construction | construction | — |
GEM identifies the owner as Leeward Energy
This entity is not yet in the GEM ownership database — chain unavailable.
Twelvemile Solar 3 is a 200 MW solar photovoltaic power plant located in Mayes County, Oklahoma. The facility is owned and operated by Leeward Asset Management, LLC. It utilizes a single generator and fixed-tilt solar tracking technology. The plant's primary fuel source is solar energy.
Twelvemile Solar 3 operates within the Southwest Power Pool (SPP) balancing authority and the Midwest Reliability Organization (MRO) NERC region. It is ranked as the largest solar plant in Oklahoma out of six such facilities, and ranks 250th nationally out of 639 solar plants. News reports indicate at least one deal associated with the plant.
Generated from EIA, GEM, and public data sources
ISO/RTO
SPP
Market
ISO/RTO Member
NERC Region
MRO — Midwest Reliability Organization
Balancing Authority
No generation data available for this plant.
2023
$1,543/kW
Est. Construction Cost
Total estimated cost: $308.6M
Point of Interconnection
Nearest Substation
Pryor Junction Substation · 138 kV
Substation Distance
2.068 km
Coord Source
OSM spatial
Market Position
ISO/RTO Market
SPP
LMP Node
CSWS.NUEN.CSI1
Pricing Hub
SPP South Hub
Location Type
Settlement Location
Node Source
Curated node match
Last updated 2026-04-19
View all articlesSouthwest Power Pool (SWPP)
Grid Voltage
—
Regulatory Status
NR — Non-Regulated
Entity Type
Independent Power Producer
Sector
IPP Non-CHP