Twelvemile Solar 1 & 2 — Plant Summary
- EIA Plant ID
- 68088
- Capacity
- 152 MW
- Primary Fuel
- Solar
- Technology
- Solar Photovoltaic
- Status
- Under construction
- Location
- Mayes, OK
- Operating Since
- —
- Generators
- 1
- Operator
- Leeward Asset Management, LLC
- Parent Company
- —
- Balancing Authority
- Southwest Power Pool
- ISO/RTO
- SPP
- NERC Region
- MRO
Twelvemile Solar 1 & 2
Under constructionSolarGEM: construction
Ranked #2 of 22 Solar plants in OK#478 of 7447 nationally
152 MW Solar under construction in Mayes, OK — Southwest Power Pool
EIAGEM
152 MW
Nameplate Capacity
1
Generators
unit
Solar Photovoltaic
Technology
—
Operating Since
Location
Coordinates
36.3316, -95.2293
County
Mayes, OK
Nearby Plants
- Saltbranch Solar 1Solar73 MW · 0.0 km
- Saltbranch 2Solar73 MW · 0.0 km
- Twelvemile Solar 3Solar200 MW · 0.0 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 | Leeward Asset Management, LLC | Leeward Energy | — |
| Owner(s) | Leeward Asset Management, LLC | Leeward Energy | — |
| Status | Under construction | construction | — |
Ownership Chain
GEM identifies the owner as Leeward Energy
This entity is not yet in the GEM ownership database — chain unavailable.
About
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
Engineering & Generators
Grid Context
NERC Region
MRO
Balancing Authority
Southwest Power Pool
Grid Voltage
kV
Regulatory Status
NR
Entity Type
Independent Power Producer
Sector
IPP Non-CHP
Generation
No generation data available for this plant.
Financial Data
No financial data available for this plant.
Pricing & Market Data
MEDIUM confidencePoint 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
News & Articles (7)Beta
Hazards·wildfire
Red Flag Warning: Benton; Washington; Osage; Washington; Nowata; Craig; Ottawa; Pawnee; Tulsa; Rogers; Mayes; Delaware
Red Flag Warning issued March 21 at 12:15PM CDT until March 22 at 8:00PM CDT by NWS Tulsa OK
NWS Tulsa OK·5 days ago
Grid·interconnection
SPP advances Texas solar project near Oklahoma border
Southwest Power Pool filed a FERC agreement to connect RWE's 298-MW Rabbit's Foot Solar project in Bowie County, Texas, near Oklahoma.
Southwest Power Pool (other)FERC (regulator)
Oklahoma Energy Today·2 months ago
Industry·corporate
LRE Starts Construction of 152 MW of Solar Power in Oklahoma
A Texas-headquartered renewable energy group said it has started construction of two solar power projects in southern Oklahoma,...
LRE (developer)
POWER Magazine·7 months ago
Industry·corporate
Construction begins on Twelvemile Solar 1 and 2 projects in Oklahoma
The projects will enhance reliable, cost-effective energy and foster ongoing investment and economic growth in the region.
Yahoo Finance·7 months ago
Last updated 2026-03-21
View all 7 articles