Wattlas

Southwest Power Pool (SPP)

Southwest Power Pool runs the high-voltage grid and wholesale electricity market across the Great Plains, from the Texas Panhandle to the Dakotas, and parts of the Mountain West. On the map, SPP has 730 power plants with 99 GW of capacity, wind the largest share at 36.7 GW. Its interconnection queue holds 683 active requests for 151.2 GW.

View on the map

Capacity by fuel

730 power plants with 99 GW of capacity, planned generators left out.

Largest plants

Planned and under construction

62 generators planned, under construction or testing, 14.9 GW in all, not counted above.

Interconnection queue

683 active requests to connect 151.2 GW of new generation and storage, and 9 suspended requests, from Lawrence Berkeley National Laboratory's Queued Up data.

Balancing authorities

States and provinces

Sources

Power plants: EIA-860M (US); NRCan NACEI (Canada, Mexico); WRI GPPD (Mexico); OpenStreetMap via Geofabrik (Canada, Mexico gap fill); USGS USWTDB/USPVDB; EPA eGRID; Natural Earth admin-1; HIFLD control areas; location attributes from WorldPop (R2025A), Global Solar Atlas PVOUT, Global Wind Atlas 4, USFS Wildfire Hazard Potential, the USGS National Seismic Hazard Model and the previous publish's lines and substations; water distances from OpenStreetMap via Geofabrik; gas distances and county queue from the previous publish's EIA gas pipelines and LBNL Queued Up requests; nearest city from Natural Earth populated places; cooling degree days from NOAA NCEI nClimDiv county normals; elevation and slope from the Copernicus DEM GLO-30 (ESA, via AWS Open Data); water stress from WRI Aqueduct 4.0; ozone nonattainment from the EPA Green Book; drought from the U.S. Drought Monitor; tribal land from US Census TIGER/Line. License: ODbL (derivative database; EIA content is public domain, NRCan OGL-Canada, WRI GPPD CC BY 4.0; location attributes from WorldPop, Global Solar Atlas, Global Wind Atlas, LBNL Queued Up and WRI Aqueduct CC BY 4.0, USFS, USGS, EIA, NOAA, EPA, US Census and Natural Earth public domain, Copernicus DEM GLO-30 © DLR e.V. and Airbus Defence and Space GmbH, the U.S. Drought Monitor courtesy of NDMC)

Interconnection queue requests: Lawrence Berkeley National Laboratory and GridTracker, "Queued Up". License: CC BY 4.0

ISO and RTO regions: HIFLD Control Areas grouped by EIA-930 reference tables membership; Natural Earth admin-1 provinces for IESO/AESO/HQ; carbon intensity from EPA eGRID (US) and ECCC National Inventory Report (Canada). License: Public domain (EPA eGRID, HIFLD); ECCC figures under the Open Government Licence – Canada