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212 MW Natural Gas Fired Combustion Turbine (98 MW) + Natural Gas Steam Turbine (114 MW) operating in Lea, NM — Southwest Power Pool
212 MW
Nameplate Capacity
3
Generators
units
Hybrid (2)
Technology
Natural Gas Fired Combustion Turbine + Natural Gas Steam Turbine
1963
Operating Since
Coordinates
32.7146, -103.3016
County
Lea, NM
Nearby Plants
| Field | EIA | GEM | Wikidata |
|---|---|---|---|
| Operator | Southwestern Public Service Co | Southwestern Public Service | — |
| Owner(s) | Southwestern Public Service Co | Xcel Energy | — |
| Status | Operating | — | — |
The Maddox plant is a 212 MW hybrid natural gas power plant located in Lea County, New Mexico. It began operating in 1963 and has 3 generators utilizing both natural gas-fired combustion turbine and natural gas steam turbine technologies. The plant is owned by Xcel Energy and operated by Southwestern Public Service Co. Maddox operates within the Southwest Power Pool (SPP) balancing authority and the broader MRO NERC region.
In the most recent year of data, Maddox generated 571,910 MWh of electricity, achieving a capacity factor of 30.8%. Maddox is ranked as the 7th largest power plant out of 11 in New Mexico, and 738th out of 945 nationally.
Generated from EIA, GEM, and public data sources
ISO/RTO
SPP
Market
ISO/RTO Member
NERC Region
MRO — Midwest Reliability Organization
Balancing Authority
Southwest Power Pool (SWPP)
Grid Voltage
115.0 kV
Regulatory Status
RE — Regulated
Entity Type
Investor-Owned Utility
Sector
Electric Utility
56.7K MWh
Latest Month
571.9K MWh
Annual Generation
30.8%
Capacity Factor
CO₂ Intensity
868 lb/MWh
NOx
1 lb/MWh
SO₂
0.004 lb/MWh
CH₄
0.026 lb/MWh
N₂O
0.003 lb/MWh
Capacity Factor
37.9%
Annual Net Gen
705 GWh
CO₂eq
869 lb/MWh
Subregion
SPP South
2013
$965/kW
Est. Construction Cost
Total estimated cost: $204.6M
Point of Interconnection
Nearest Substation
Maddox substation · 115 kV
Substation Distance
< 10 km
Coord Source
OSM spatial
Market Position
ISO/RTO Market
SPP
LMP Node
SPS.MADDOX1
Pricing Hub
—
Location Type
Settlement Location
Node Source
EIA-860 direct report
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