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Glossary
Glossary of terms and acronyms
 
The definitions and acronyms included in this glossary originate from the Business Practice Manual for Definitions and Acronyms, the ISO Tariff Appendix A, Master Definitions Supplement, and the ISO Orientation Module.
 
Please refer to the Business Practice Manual for Definitions and Acronyms for the most up to date list of terms.
 
Updated 06/01/2023
 
Filter by letter of the alphabet, acronym, term name, or source.
  
  
  
Definition
  
AAccepted Bid
A Submitted Bid that has passed Bid content validation process as described in Section 8.2.1.1 of the BPM for Market Instruments.
Appendix A of the CAISO Tariff
AAIMAccess and Identity Management
Business Practice Manual
AAccess Charge
A charge paid by all Utility Distribution Companies, Small Utility Distribution Companies, and MSS Operators with Gross Load in a PTO Service Territory, as set forth in Article II. The Access Charge includes the Regional Access Charge and the Local Access Charge. The Access Charge will recover the Participating TO’s Transmission Revenue Requirement in accordance with Appendix F, Schedule 3.
Appendix A of the CAISO Tariff
AAIMAccess Identity Management
CAISO Orientation Module
AAPAccounts Payable
Money the CAISO owes to a Business Associate.
Appendix A of the CAISO Tariff
AARAccounts Receivable
Money a Business Associate owes to the CAISO.
Appendix A of the CAISO Tariff
AAcquired Resource
A resource providing Resource Adequacy Capacity under a resource-specific power supply contract that was exempt from the provisions of the standard capacity product at the time RAAIM became effective
Appendix A of the CAISO Tariff
AActual Settlement Quality Meter Data
Settlement Quality Meter Data gathered, edited, validated, and submitted by the Scheduling Coordinators on behalf of Scheduling Coordinator Metered Entities.
Appendix A of the CAISO Tariff
AAAEEAdditional Achievable Energy Efficiency
CAISO Orientation Module
AAdjusted Load Metric
A Load Serving Entity’s Load Metric minus the megawatts of Load served using Existing Transmission Contracts, Converted Rights, and Transmission Ownership Rights.
Appendix A of the CAISO Tariff
AAdjusted RMR Invoice
The monthly invoice issued by the RMR Owner to the CAISO for adjustments made to the Revised Estimated RMR Invoice pursuant to the RMR Contract reflecting actual data for the billing month.
Appendix A of the CAISO Tariff
AAdjusted Verified CRR Source Quantity
The MW amount eligible for nomination by an LSE or Qualified OBAALSE in a verified tier of the CRR Allocation process, determined by reducing a Verified CRR Source Quantity to account for circumstances 25 California Independent System Operator Corporation Fifth Replacement Electronic Tariff March 16, 2018 Appendix A where the ownership or contract right to a generating resource is effective only for a portion of a particular season or month for which CRRs are being nominated.
Appendix A of the CAISO Tariff
AAdministrative Price
The market results determined according to Section 7.7.9.
Appendix A of the CAISO Tariff
AAdverse System Impact
The negative effects due to technical or operational limits on conductors or equipment being exceeded that may compromise the safety and reliability of the electric system.
Appendix A of the CAISO Tariff
AAffected System
An electric system other than the CAISO Controlled Grid that may be affected by the proposed interconnection, including the Participating TOs’ electric systems that are not part of the CAISO Controlled Grid.
Appendix A of the CAISO Tariff
AAffected System Operator
The entity that operates an Affected System
Appendix A of the CAISO Tariff
AAffiliate
With respect to a corporation, partnership or other entity, each such other corporation, partnership or other entity that directly, or indirectly through one or more intermediaries, controls, or is controlled by, or is under common control with, such corporation, partnership or other entity.
Appendix A of the CAISO Tariff
AACCAggregate Capability Constraint
A constraint that reflects the combined maximum and the combined minimum capability of Generating Units that comprise a single Generating Facility so that the capability does not exceed the Generating Facility’s Interconnection Service Capacity or charging capacity specified in its Generator Interconnection Agreement. In the case of EIM Participating Resources, a constraint that reflects the combined maximum and the combined minimum capability of individual EIM Participating Resources or non-participating resources that comprise a single resource.
Appendix A of the CAISO Tariff
AAggregate Credit Limit
The sum of a Market Participant’s or CRR Holder’s Unsecured Credit Limit and its Financial Security Amount, as provided for in Section 12.
Appendix A of the CAISO Tariff
AAggregate Generating Resource
A Physical Scheduling Plant or System Unit.
Business Practice Manual
AAggregated Participating Load
An aggregation at one or more Participating Load Locations, created by the CAISO in consultation with the relevant Participating Load, for the purposes of enabling participation of the Participating Load in the CAISO Markets like Generation by submitting Supply Bids when offering Curtailable Demand and as nonParticipating Load by submitting Demand Bids to consume in the Day-Ahead Market only.
Appendix A of the CAISO Tariff
AAGLAggregated Pricing Location
CAISO Orientation Module
AAPLAggregated Pricing Location
Business Practice Manual
AAPNode/APNAggregated Pricing Node (Aggregated Pnode)
A Load Aggregation Point, Trading Hub or any group of Pricing Nodes as defined by the CAISO.
Appendix A of the CAISO Tariff
AAggregated Unit
A group of two or more Generating Units, each individually capable of producing Energy and operating in parallel with the electric grid in the ISO Balancing Authority Area, which are aggregated for scheduling and Settlement purposes and operated as if they were a single Generating Unit. An Aggregated Unit must first be approved by the ISO and may represent a Physical Scheduling Plant or collection of other Generating Units, which need to be combined for operational purposes due to common metering, electrical connection arrangement, interrelated operating characteristics, or other physical factors or constraints.
Appendix A of the CAISO Tariff
AACRAll Constraints Run
Appendix A of the CAISO Tariff
AAAEAllocation Eligible Entities
Business Practice Manual
AACAlternating Current
Business Practice Manual
AACAlternating Current
CAISO Orientation Module
AADRAlternative Dispute Resolution
Appendix A of the CAISO Tariff
AAmended QF Contract
A Legacy PPA, as defined in the settlement approved by the CPUC in Decision D. 10-12-035 (December 16, 2010), as modified in Decision D.11-07-010 (July 15, 2011), that became effective on or prior to December 20, 1995 or, in the case of a Participating Generator employing landfill gas technology, on or prior to December 31, 1996, that has been amended to include terms that conform with a Legacy PPA Amendment or a Legacy PPA C1 Amendment, as defined by said settlement, but also in a manner that (a) requires compliance with the CAISO Tariff; (b) does not extend the term of the agreement or provide for an increase in the generating capacity of the resource; and (c) does not change the electrical characteristics of the resource.
Appendix A of the CAISO Tariff
AAS AwardAncillary Service Award
The notification by the CAISO indicating that a Bid to supply an Ancillary Service has been selected to provide such service in the DAM or RTM.
Appendix A of the CAISO Tariff
AAS BidAncillary Service Bid
The Bid component that indicates the quantity in MW and a price in dollars per MW for a specific Ancillary Service, including Regulation Up, Regulation Down, Spinning Reserve and Non-Spinning Reserve, that a Scheduling Coordinator is offering to supply in a CAISO Market from a Generating Unit or System Resource, and only for Non-Spinning Reserve from the Load of a Participating Load or Proxy Demand Resource.
Appendix A of the CAISO Tariff
AAS Bid CostAncillary Service Bid Cost
An amount equal to the product of the AS Award from each accepted AS Bid, reduced by any applicable No Pay capacity, and the relevant AS Bid price.
Appendix A of the CAISO Tariff
AASMPAncillary Service Marginal Price
The marginal cost of providing an Ancillary Service as further provided in Section 27.1.2.
Appendix A of the CAISO Tariff
AAS ObligationAncillary Service Obligation
A Scheduling Coordinator’s hourly obligation for Regulation Down, Regulation Up, Spinning Reserves, and Non-Spinning Reserves calculated pursuant to Section 11.10.2.1.3, 11.10.2.2.2, 11.10.3.2, and 11.10.4.2, respectively.
Appendix A of the CAISO Tariff
AAncillary Service Provider
A Participating Generator, System Resource operator, Participating Load, or Proxy Demand Resource that is certified to provide an Ancillary Service.
Appendix A of the CAISO Tariff
AAS RegionaAncillary Service Region
The System Region, the Expanded System Region, or any Sub-Region identified by the CAISO for procurement of Ancillary Services.
Appendix A of the CAISO Tariff
AAncillary Service Regional Limit
A maximum or a minimum, or both a maximum and a minimum, amount of (or boundary of) Ancillary Services to be obtained within an AS Region. Limits can be expressed as either megawatt amounts or percentages.
Appendix A of the CAISO Tariff
AAS ScheduleAncillary Service Schedule
The notification by the CAISO indicating that a Submission to Self-Provide an Ancillary Service has been selected to provide such service in the DAM or RTM.
Appendix A of the CAISO Tariff
AAS or A/SAncillary Services
Regulation, Spinning Reserve, Non-Spinning Reserve, and Voltage Support with such other interconnected operation services as the CAISO may develop in cooperation with Market Participants to support the transmission of Energy from Generation resources to Loads while maintaining reliable operation of the CAISO Controlled Grid in accordance with WECC standards and Good Utility Practice.
Appendix A of the CAISO Tariff
AAnnual Interregional Coordination Meeting
Shall have the meaning set forth in Section 24.18.2.
Appendix A of the CAISO Tariff
AAnnual Interregional Information
Shall have the meaning set forth in Section 24.18.1.
Appendix A of the CAISO Tariff
AAnnual Peak Demand Forecast

A Demand Forecast of the highest Hourly Demand in a calendar year, in MW.
Appendix A of the CAISO Tariff
AApplicable Reliability Criteria
The Reliability Standards and reliability criteria established by NERC and WECC and Local Reliability Criteria, as amended from time to time, including any requirements of the NRC.
Appendix A of the CAISO Tariff
AAARFApplication Access Request Form
CAISO Orientation Module
AAARFApplication Access Request Form
Business Practice Manual
AAPIApplication Programming Interface
CAISO Orientation Module
AApproved Load Profile
Local Regulatory Authority approved Load profiles applied to cumulative End-Use Meter Data in order to allocate consumption of Energy to Settlement Periods.
Appendix A of the CAISO Tariff
AApproved Maintenance Outage
A Maintenance Outage that has been approved by the CAISO.
Appendix A of the CAISO Tariff
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