152 MW Solar under construction in Mayes, OK — Southwest Power Pool
152 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 1 & 2 is a 152 MW solar photovoltaic power plant located in Mayes County, Oklahoma. The plant is owned and operated by Leeward Asset Management, LLC. It utilizes fixed-tilt solar tracking technology. The plant is the second-largest solar facility in Oklahoma out of six, and ranks 344th nationally out of 639 solar plants.
The plant connects to the Southwest Power Pool (SPP) balancing authority, within the Midwest Reliability Organization (MRO) NERC region. The facility consists of one generator and uses solar energy as its primary fuel source.
Generated from EIA, GEM, and public data sources
NERC Region
MRO
Balancing Authority
Southwest Power Pool
Grid Voltage
—
Regulatory Status
NR
Entity Type
Independent Power Producer
Sector
IPP Non-CHP
No generation data available for this plant.
2023
$1,543/kW
Est. Construction Cost
Total estimated cost: $234.5M
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
Node Source
Curated node match
Last updated 2026-03-26
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