The SPP footprint is modeled as 18 settlement zones

LES
NPPD
OPPD
WAUE
EDE
INDN
KACY
KCPL
MPS
SECI
SPRM
WR
CSWS
GRDA
OKGE
SPS
WFEC
AZARCOIDILIAKSKYLAMNMSMOMTNENMNDOKSDTNTXUTWIWYEDE: Empire District ElectricINDN: City of Independence, MissouriKACY: Kansas City Board of Public UtilitiesKCPL: Kansas City Power and Light (Evergy Metro)MPS: Evergy Missouri WestSECI: Sunflower Electric PowerSPRM: City Utilities of Springfield, MissouriWR: Westar Energy (Evergy Kansas Central)LES: Lincoln Electric SystemNPPD: Nebraska Public Power DistrictOPPD: Omaha Public Power DistrictWAUE: WAPA Upper Great Plains East and Basin ElectricWAUE: WAPA Upper Great Plains East and Basin ElectricCSWS: Southwestern Electric Power — SWEPCO (AEP West)CSWS: Public Service of Oklahoma (AEP West)GRDA: Grand River Dam AuthorityOKGE (eastern): Oklahoma Gas and ElectricOKGE (western): Oklahoma Gas and ElectricSPS: Southwestern Public Service (Xcel Energy)WFEC: Western Farmers Electric CooperativeCSWSEDEMPSNPPDOKGEOPPDSECISPSWAUEWFECWR

Source: SPP, EIA-861, US Census, Modo Energy

Note: counties are grouped into 18 settlement zones, each settling at its own locational marginal price. Hover a zone for its member utility.

MODOENERGY