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NERC Acronyms: A Comprehensive
Guide to Electric Reliability Standards
AC - ANSWERAlternating Current ACE - ANSWERArea Control Error ADI - ANSWERACE Diversity Interchange AFC - ANSWERAvailable Flowgate Capability AFN - ANSWERAbnormal Frequency Notification ATC - ANSWERAvailable Transfer Capability ATF - ANSWERAfter the Fact AGC - ANSWERAutomatic Generation Control AIE - ANSWERArea Interchange Error ALM - ANSWERActive Load Management ALR - ANSWERAdequate Level of Reliability AML - ANSWERActively Monitored List AMR - ANSWERAutomatic Meter Reading ANSI - ANSWERAmerican National Standards Institute APX - ANSWERAutomatic Power Exchange ARS - ANSWERAutomatic Reserve Sharing ATC - ANSWERAvailable Transmission Capacity
ATEC - ANSWERAutomatic Time Error Correction AVR - ANSWERAutomatic Voltage Regulator BA - ANSWERBalancing Authority BAL - ANSWERResource and Demand Balancing (Standards Family) BAAL - ANSWERBalancing Authority ACE Limit BES - ANSWERBulk Electric System BOT - ANSWERBoard of Trustees BOTCC - ANSWERBoard of Trustees Compliance Committee BPS - ANSWERBulk Power System CA - ANSWERControl Area or Critical Asset CAP - ANSWERCorrective Action Process CB - ANSWERCircuit Breaker CBM - ANSWERCapacity Benefits Margin CCA - ANSWERCritical Cyber Asset CCC - ANSWERCompliance and Certification Committee CCP - ANSWERCritical Constrained Path CCVT - ANSWERCapacitor-coupled voltage transducer CEH - ANSWERContinuing Education Hour CEI - ANSWERCompliance Enforcement Initiative CETL - ANSWERCapacity Emergency Transfer Limit CF - ANSWERCoordinated Flowgates
DP - ANSWERDistribution Provider DSM - ANSWERDemand Side Management DTS - ANSWERDispatcher Training Simulator EA - ANSWEREvent Analysis EAIE - ANSWEREvent Analysis and Information Exchange EDT - ANSWEREastern Daylight Time EEI - ANSWEREdison Electric Institute EHV - ANSWERExtra High Voltage EMP - ANSWERElectromagnetic Pulse EMS - ANSWEREnergy Management System EOP - ANSWEREmergency Preparedness and Operations (Standards Family) EPRI - ANSWERElectric Power Research Institute ERO - ANSWERElectric Reliability Organization ES-ISAC - ANSWERElectricity Sector Information Sharing and Analysis Center ESP - ANSWERElectronic Security Perimeter ETC - ANSWERExisting Transmission Commitments ETIN - ANSWERElectronic Transmission Information Network FAC - ANSWERFacilities Design, Connections, and Maintenance (Standards Family) FAT - ANSWERFactory Acceptance Test FBA - ANSWERFlow-Based Analysis
FCITC - ANSWERFirst Contingency Incremental Transfer Capability FCL - ANSWERFault Current Limiter FCTTC - ANSWERFirst Contingency Total Transfer Capability FDR - ANSWERFrequency Data Recorder FEMA - ANSWERFederal Emergency Management Administration FERC - ANSWERFederal Energy Regulatory Commission FFT - ANSWERFind, Fix and Track (sometimes FFTR for Find, Fix, Track and Report) FM - ANSWERFunctional Model FOH - ANSWERForced Outage Hours FOIA - ANSWERFreedom of Information Act FPA - ANSWERFederal Power Act FRCC - ANSWERFlorida Reliability Coordinating Council (Regional Entity) GADS - ANSWERGeneration Availability Data System GCIR - ANSWERGeneration Capability Import Requirement GLDF - ANSWERGenerator-to-Load Distribution Factor GMD - ANSWERGeometric Mean Distance GO - ANSWERGenerator Owner GOL - ANSWERGenerator Operator Limit GOP - ANSWERGenerator Operator GSF - ANSWERGenerator Shift Factor
IOU - ANSWERInvestor Owned Utility IP - ANSWERInternet Protocol IPP - ANSWERIndependent Power Producer IPX - ANSWERIndependent Power Exchange IRL - ANSWERInterconnection Reliability Limit IRO - ANSWERInterconnection Reliability Operations and Coordination (Standards Family) IROL - ANSWERInterconnection Reliability Operating Limit IRP - ANSWERIntegrated Resource Plan ISAC - ANSWERInformation Sharing and Advisory Center ISC - ANSWERIndependent Security Center ISO - ANSWERIndependent System Operator JOA - ANSWERJoint Operating Agreement JTSIN - ANSWERJoint Transmission System Information Network KRSSC - ANSWERKey Reliability Standards Spot Check kV - ANSWERkilovolts LCO - ANSWERLimited Condition of Operation LDC - ANSWERLocal Distribution Company LIFO - ANSWERLast In - First Out LMP - ANSWERLocal Marginal Pricing LOOP - ANSWERLoss of Off-site Power
LOP - ANSWERLoss of Potential LSE - ANSWERLoad-Serving Entity LSF - ANSWERLoad Shift Factor LTC - ANSWERLoad Tap Changer LTRA - ANSWERLong Term Reliability Assessment MM - ANSWERMarket Monitor MOD - ANSWERModeling, Data, and Analysis (Standards Family) MP - ANSWERMarket Participants MRC - ANSWERMember Representatives Committee MRO - ANSWERMidwest Reliability Organization (Regional Entity) MTU - ANSWERMaster Terminal Unit MUST - ANSWERMaximizing Utility System Transfer MVA - ANSWERMegaVoltAmperes MVAR - ANSWERMegavar MW - ANSWERMegawatts MWh - ANSWERMegawatt hours NAESB - ANSWERNorth American Energy Standards Board NCF - ANSWERNet Capacity Factor NCR - ANSWERNERC Compliance Registry NCSD - ANSWERNational Cyber Security Division
NUG - ANSWERNon-Utility Generator OAG - ANSWEROpen Access Gateway OASIS - ANSWEROpen Access Same Time Information System OATT - ANSWEROpen Access Transmission Tariff OC - ANSWEROperating Committee OL - ANSWEROperating Limit OP - ANSWEROperating Procedures OPF - ANSWEROptimal Power Flow OSL - ANSWEROperating Security Limit OTC - ANSWEROperating Transfer Capability OTDF - ANSWEROutage Transfer Distribution Factor PA - ANSWERPlanning Authority PC - ANSWERPlanning Committee or Planning Coordinator PCB - ANSWERPower Circuit Breaker PER - ANSWERPersonnel Performance, Training, and Qualifications (Standards Family) PLC - ANSWERProgrammable Logic Controller POD - ANSWERPoint of Delivery POR - ANSWERPoint of Receipt POTT - ANSWERPermissive Overreach Transfer Trip PRC - ANSWERProtection and Control (Standards Family)
PSC - ANSWERPublic Service Commission PSDR - ANSWERPower System Data Recorder PSE - ANSWERPurchasing-Selling Entity PSM - ANSWERPower System Measurements PSP - ANSWERPhysical Security Perimeter PSS - ANSWERPower System Stabilizer PSS/E - ANSWERPower System Simulator/Electric PT - ANSWERPotential Transformer PTDF - ANSWERPower Transfer Distribution Factor PTP - ANSWERPoint to Point Transmission Service PU - ANSWERPer Unit PUC - ANSWERPublic Utilities Commission PUHCA - ANSWERPublic Utilities Holding Company Act PURPA - ANSWERPublic Utilities Regulator Policy Act PV - ANSWERPotential Violation PX - ANSWERPower Exchange QF - ANSWERQualified Facility RA - ANSWERReliability Authority RAPA - ANSWERReliability Assessment and Performance Analysis RAS - ANSWERRemedial Action Scheme
SCADA - ANSWERSupervisory Control and Data Acquisition SDT - ANSWERStandard Drafting Team SDX - ANSWERSystem Data Exchange SE - ANSWERState Estimator SERC - ANSWERSERC Reliability Corporation (Regional Entity) SMD - ANSWERSolar Magnetic Disturbance SOL - ANSWERSystem Operating Limits SOTC - ANSWERStandards Oversight and Technology Committee SPIG - ANSWERStandards Process Input Group SPM - ANSWERStandard Processes Manual SPOC - ANSWERSingle Point of Contact SPP - ANSWERSouthwest Power Pool RE (Regional Entity) SPS - ANSWERSpecial Protection Systems / Schemes SRI - ANSWERSystem Risk Index SSVT - ANSWERStation Services voltage transformer STDB - ANSWERSpare Transformer Database SVC - ANSWERStatic Var Compensator TA - ANSWERTransmission Administrator TADS - ANSWERTransmission Availability Administrator TFC - ANSWERTotal Flowgate Capability
TDF - ANSWERTransfer Distribution Factor TFE - ANSWERTechnical Feasibility Exception TLR - ANSWERTransmission Loading Relief TO - ANSWERTransmission Owner TOP - ANSWERTransmission Operator or Transmission Operations (Standards Family) TP - ANSWERTransmission Planner or Transmission Provider TPF - ANSWERTransaction Participation Factor TPL - ANSWERTransmission Planning (Standards Family) TRE - ANSWERTexas Reliability Entity (Regional Entity) TRM - ANSWERTransmission Reliability Margin TSIN - ANSWERTransmission System Information Network TSP - ANSWERTransmission Service Provider TSR - ANSWERTransmission Service Reservation TTC - ANSWERTotal Transfer Capability TWh - ANSWERTerawatt hour (trillion watts hours) UFLS - ANSWERUnder-Frequency Load Shedding URC - ANSWERUtilities Regulatory Commission UVLS - ANSWERUnder Voltage Load Shedding VAR - ANSWERVoltage and Reactive (Standards Family) VPN - ANSWERVirtual Private Network
