BPAT

PACW

NWMT

IPCO

NEVP

CISO

WAUW

PSCO

WACM

PNM

EPE

WALCAZPS

IID SRPTEPC

BANC

TIDC

LDWP

AVA

PGETPWR SCL

PSEI DOPD

CHPDGCPD

WWA

GWA

GRIF

HGMA

GRMADEAA

GRID

PACE

CFE

BCHAAESOAESO - Alberta Electric System

OperatorAVA - Avista CorporationAZPS - Arizona Public Service CompanyBANC - Balancing Authority of Northern CaliforniaBCHA - British Columbia Hydro AuthorityBPAT - Bonneville Power Administration-TransmissionCFE - Comision Federal de ElectricidadCHPD - PUD No. 1 of Chelan CountyCISO - California Independent System OperatorDEAA - Arlington Valley, LLCDOPD - PUD No. 1 of Douglas CountyEPE - El Paso Electric CompanyGCPD - PUD No. 2 of Grant CountyGRID - Gridforce Energy Management, LLCGRIF - Griffith Energy, LLCGRMA - Gila River Power, LPGWA - NaturEner Power Watch, LLCHGMA - New Harquahala Generating Company, LLCIID - Imperial Irrigation DistrictIPCO - Idaho Power CompanyLDWP - Los Angeles Department of Water and PowerNEVP - Nevada Power CompanyNWMT - NorthWestern EnergyPACE - PacifiCorp EastPACW - PacifiCorp WestPGE - Portland General Electric CompanyPNM - Public Service Company of New MexicoPSCO - Public Service Company of ColoradoPSEI - Puget Sound EnergySCL - Seattle City LightSRP - Salt River ProjectTEPC - Tucson Electric Power CompanyTIDC - Turlock Irrigation DistrictTPWR - City of Tacoma, Department of Public UtilitiesWACM - Western Area Power Administration, Colorado-Missouri RegionWALC - Western Area Power Administration, Lower Colorado RegionWAUW - Wester Area Power Administration, Upper Great Plains WestWWA - NaturEner Wind Watch, LLC BA boundaries are approximate and for illustrative purposes only

Western Interconnection Balancing AuthoritiesJanuary 5, 2017

Not a NERC-Registered BAPACE & PACW are asingle registeredentity but two BAs