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Glossary of Terms

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					Glossary of Terms

[A] [B] [C] [D] [E] [F] [G] [H] [I] [L] [M] [N] [O] [P] [Q] [R] [S] [T] [U] [W ] [acronyms][bottom]




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Access Charge
        a fixed tariff rate that recovers the portion of a utility's transmission revenue requirement
        not recovered through the variable Usage Charge
Actual Imbalance
        a deviation between last accepted generation and load schedule compared to the actual
        generation and load delivered
Aggregator
        an entity responsible for planning, scheduling, accounting, billing and settlement for
        energy deliveries from the aggregator's portfolio of Sellers (generators, purchases)
        and/or Buyers (loads or sales)
Ancillary Services
        the services other than scheduled energy which are required to maintain system
        reliability and meet WSCC/NERC operating criteria. Such services include spinning,
        non-spinning, replacement reserves, regulation (AGC), voltage control and black start
        capability
Arbitrator
        an individual selected to resolve disputes arising between market participants, including
        the ISO and/or the PX as outlined in the ISO and PX Bylaws
Arbitration Committee
        a subcommittee of the ISO and PX Governing Boards to which the arbitration
        responsibilities of the Governing Board have been delegated
Automatic Generation Control (AGC)
        generation equipment that automatically provide Regulation


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Balancing Account
        an account set up to allow periodic balancing of financial transactions that, under
        normal course of business, do not result in a zero balance of cash inflows and outflows
        within a specified accounting period
Balancing Energy Supply
         energy not scheduled in advance that is required to meet energy imbalances in real-
         time. This energy is supplied by Generators under the ISO's control, providing spinning
         and non-spinning reserves, replacement reserved, and regulation, and other generators
         able to respond to the ISO's request for more or less energy
Bilateral Contract
         an agreement for the purchase and the sale of energy products and services
Broker
         an entity acting as an agent for others in negotiating contracts, purchases, or sales of
         electrical energy or services without owning any transmission or generation facilities.
         Such business or party does not take ownership for the power transacted
Buyer
         an entity that purchases electrical energy or services from the PX or through a Bilateral
         Contracts on behalf of End-Use Customers


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Committed Load
         the load that has been accepted to be served either in the day ahead r hour ahead
         bidding process
Competition Transition Charge (CTC)
         as authorized by the CPUC, a charge allowing the collection of transition costs in a
         competitively-neutral manner that does not increase rates for any customer class solely
         due to the existence of transition costs. [Section 367, AB 1890]
Congestion Zone
         a zone identified as an active zone in Appendx I of the ISO Tariff
Constraints
         physical and operational limitation in the transfer of electrical power through
         transmission facilities
Contingency
         disconnection or separation, planned or forced, of one or more components from the
         electric system
Contingency Reserve
         An amount of spinning and non-spinning reserve, sufficient to reduce area control error
         (ACE) to zero within ten minutes.
Contract for Difference
         a financial contract for the purchase of electricity. This contract enables customers to
         purchase power under a fixed price contract without notifying the ISO of the contract
Control Area
        an electrical region that regulates its generation in order to balance load and maintain
        planned interchange schedules with other [control areas] and assists in controlling the
        frequency of the interconnected system in accordance with WSCC and NERC criteria
Control Area Balancing Function
        the real-time dispatch of generation output (and curtailable load) to balance with actual
        load during the current operating reliability criteria. These changes are directed by the
        ISO
Cost Shifting
        a transfer of costs from one customer class to another, or from one utility to another
Curtailable Demand
        a level of load that can be curtailed at the discretion of the ISO in the real-time dispatch
        of the ISO Grid. Customers with Curtailable Demand (purchased either through the PX
        or under a bilateral contract) may offer it to the ISO to meet the non-spinning or
        replacement reserve ancillary service requirements


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Day-Ahead Market
        The forward market for the supply of electrical power at least 24 hours before delivery to
        Buyers and End-Use Customers
Decremental Price
        The ISO holds an energy market and sorts bids in price merit order and calls upon the
        bids when necessary to adjust the balance between generation and load. Each hour is
        divided into six-ten minute BEEP (Balancing Energy and Ex-post Price) intervals. A
        separate incremental (ISO pays SC to increase generation) and decremental (SC pays
        ISO to decrease generation) price may be set during each trading interval. Instructed
        deviations receive the ten minute interval price and un-instructed deviations receive or
        are charged the hourly ex-post price.
Demand
        the rate expressed in kilowatts, or megawatts, at which electric energy is delivered to or
        by a system, or part of a system at a given instant or averaged over an designated
        interval of time
Demand Bid
        a Retailer's bid into the PX indicating a maximum price the customer is prepared to pay.
        This Demand will only be committed in the PX auction process if the market clearing
        price is at or below the price of the Demand Bid
Demand Zone
        a group of load groups constitute a demand zone
Direct Access
        the right for a Generator to engage in a Bilateral Contract with a Buyer
Direct Access Generation
        the generation output which is used to meet the demand of Bilateral Contracts
Direct Access Demand
        the energy consumption met under Bilateral Contracts who are eligible to select their
        supplier of electric power
Dispatch
        the operating control of an integrated electric system to 1) assign generation of specific
        generating stations and other sources of supply to effect the most reliable and
        economical supply as the total of the significant area loads rises or falls; 2) Control
        operations of high-voltage lines, substation, and equipment; 3) operate the interconnect;
        and 4) schedule energy transactions with other interconnected electric utilities
Distribution System
        the distribution assets of transmission owners that are not under the control of the ISO
        and are used to transmit power from the ISO Grid/distribution interfaces to the end-
        users


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Electric Capacity
        the rated continuous load-carrying ability, expressed in megawatts (MW) or megavolt-
        amperes (MVA) of generation, transmission, or other electrical equipment.
Electric Energy
        the generation or use of electric power by a device over a period of time, expressed in
        kilowatt-hours (kWh), megawatt-hours (MWh), or gigawatt-hours (GWh).
Emergency
        any abnormal system condition which required immediate manual or automatic action to
        prevent loss of load, equipment damage, or tripping of system elements which might
        result in cascading and to restore system operation to meet the Minimum Operating
        Reliability Criteria
Emergency notice
        a notice issued by the ISO when the system reliability of the ISO controlled grid is in
        danger of instability, voltage collapse, or under-frequency caused by transmission or
        generation trouble in the ISO control area, or events outside of the ISO control area that
        could result in a cascade of events throughout the WSCC grid.
        Stage 1: Actual or anticipated operating reserves are less than WSCC minimum
        operating reserve criteria.
        Stage 2: Actual or anticipated operating reserves are less than or equal to five percent
        (5%).
        Stage 3: Actual or anticipated operating reserves are less than or equal to 1 1/2%
End-Use Customer
        a residential, commercial, agricultural, or industrial customer in the electric industry who
        buys electric power to be consumed as a final product (not for resale)
Energy Management System (EMS)
        a computer-controlled system used by operators of electric utilities to monitor the real-
        time performance of the various elements of an electric system and to control
        generation and transmission facilities
Equipment Clearances
        the process by which the ISO grants authorization to an equipment operator to connect
        or disconnect electric equipment affecting the grid
External Control Area
        A relevant control area that is not part of the ISO's control grid


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FERC
        Federal Energy Regulatory Commission.
Final Day Ahead Schedule
        the schedule of generation output/consumption that has been accepted by the ISO in
        the day-ahead market
Financial Contracts
        see Contracts for Difference
Flexible Generation
        a Generator that is capable and willing to adjust operating levels in response to Real-
        Time Market price or ISO control signals
Forced Outage
        generating units not in operation due to breakdowns, storms or other unplanned
        occurances


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Generation Scheduling
        the planned hourly pattern of generation output
Generator
        an entity capable of producing electrical energy
Grid
        an electric system linking transmission lines both regionally and locally
Grid Management Charge
        an approved FERC tariff which recovers the ISO's on-going operating and management
        costs


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Hour-Ahead Market
        the electric power futures market that is established 1-hour before delivery to End-Use
        Customers


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Incremental Price
        The ISO holds an energy market and sorts bids in price merit order and calls upon the
        bids when necessary to adjust the balance between generation and load. Each hour is
        divided into six-ten minute BEEP (Balancing Energy and Ex-post Price) intervals. A
        separate incremental (ISO pays SC to increase generation) and decremental (SC pays
        ISO to decrease generation) price may be set during each trading interval. Instructed
        deviations receive the ten minute interval price and un-instructed deviations receive or
        are charged the hourly ex-post price.
Independent Power Producers (IPP)
        a non-utility
Independent System Operator (ISO)
        the ISO is the FERC regulated control area operator of the ISO transmission grid. Its
        responsibilities include providing non-discriminatory access to the grid, managing
        congestion, maintaining the reliability and security of the grid, and providing billing and
        settlement services. The ISO has no affiliation with any market participant.
Investor Owner Utility (IOU)
        a utility entity whose assets are owned by investors
ISO Control Area
        the electrical region under the operational control of the ISO
ISO Grid
        the combined transmission assets of Transmission Owners that are collectively under
         the control of the ISO
ISO Transmission Grid
         refer to ISO Grid


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Load
         an end-use device or an end-use customer that receives power from the electric
         system. Load should not be confused with Demand, which is the measure of power that
         a Load receives or requires.
Local Publicly Owned Electric Utilities
         a municipal corporation, a municipal utility district, an irrigation district, or a joint power
         authority (which can include one or more of the agencies mention above) furnishing
         electric services over its own transmission facilities, or furnishing electric service over its
         own or its members' distribution system
Locational Market Clearing Price
         the price at which supply equals demand at a specified location. All demand which is
         prepared to pay at least this price at the specified location has been satisfied. All supply
         which is prepared to operate at or below this price in the specified location has been
         purchased.
Losses
         electric energy losses in the electric system which occur principally as energy
         transformation from kilowatt-hours (kWh) to waste heat in electrical conductors and
         apparatus
Loss Factor
         the ratio of the average loss in kilowatts (kW) during a designated period to the peak or
         maximum loss in kW occurring in that period


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Market Clearing Price
         the price at a location at which supply equals demand--all demand at or above this price
         has been satisfied, and all supply at or below this price has been purchased
Market Forces
         competition for sales, new alliances, innovative pricing structures, customer demand,
         choice, and various kinds of services
Market Participant
         an entity who participates in the electrical energy marketplace through the buying and
        selling of electrical energy or services
Marketer
        an entity who takes title to electric power and then resells the power to end-use
        customers. This entity, who acts for itself in negotiating contracts, purchases, or sales of
        electrical energy, is required to meet two FERC tests to be certified as a Power
        Marketer: 1) show lack or adequate mitigation of transmission power; and 2) prove non-
        dominance of market power
Merit Order Rank
        the ranking by the PX of generation according to their applicable bid prices for
        scheduling and price setting purposes
Minimum Operating Reliability Criteria (MORC)
        Minimum operating reserve is the sum of a)regulating reserve plus b)contingency
        reserve plus C) addtional reserve for interruptible imports plus D) additional reserve for
        on-demand obligations
Municipal Utility
        a Local Publicly Owned Electric Utility that owns or operates electric facilities subject to
        the jurisdiction of a municipality, as opposed to being subject to FERC or CPUC
        jurisdiction
Must Take Resources
        generation resources including QF generating units, nuclear units, and pre-existing
        power purchase contracts with minimum energy take requirements that are dispatched
        by the ISO before PX or Direct Access Generation.


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Next-Day System Requirement
        generation remaining on line during overgeneration load hours to be available to serve
        the next day's load. The quantity of total Next Day System Requirement generation is
        determined by taking a percentage of the 'system swing load' (the difference between
        the peak and minimum system load). This is then allocated between the PX and non-PX
        by each party's contribution to the peak load on a system-wide basis
NoTouch Day
        A “No Touch Day” is a precautionary restriction, issued by the ISO to limit routine work
        or maintenance in an effort to preclude an avoidable loss of resources. During a No
        Touch Day no work or adjustments will be performed to the power transmission system,
        system Generation, or associated computer control systems without the express
        permission of the ISO.
Non-ISO Transmission Facilities
         the transmission facilities not placed under the control of the ISO
Non-PX Generation
         generation scheduled into the ISO by a Scheduling Coordinator other than the PX
Non-Spinning Reserve
         the portion of off-line generating capacity, controlled by the ISO, which is capable of
         being loaded in 10 minutes, or load which is capable of being interrupted in 10 minutes
         and which is capable of running (or being interrupted) for at least two hours
NERC
         North American Electric Reliability Council


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Obligation to Serve
         a regulatory obligation of a utility to provide electric planning services for all customers
         and to assure adequate supply of electricity now and in the future
Offpeak Hours
         11 pm, 12 midnight and 1 to 6am
Operating Reserve
         the combination of spinning and non-spinning reserve required to meet SWCC and
         NERC requirements for reliable operation of the grid
Optimal Power Flow (OPF)
         an estimation procedure utilizing a computer software package capable of minimizing a
         desired objective function within system operating limits by scheduling designated
         active and/or reactive resources, and by recognizing the interactions between
         generation load, and the transmission grid
Outage
         refer to Contingency
Over-Generation Condition
         the system condition where the sum of the desired generation output, absent mitigation,
         would be greater than the system load


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Path
         line or group of lines in which WSCC assigned as paths with numbers to differentiate
         them
Peak Hours
        7am to 10pm inclusively
Performance Based Ratemaking (PBR)
        regulated rates based on performances objectives, not actual costs
Planned Outage
        generating units not in operation due to planned maintenance, scheduled closures,
        refueling, or other planned occurances
Power Exchange (PX)
        and independent agency responsible for conducting an auction for the generators
        seeking to sell energy and for loads which are not otherwise being served by bilateral
        contracts. The Power Exchange will be responsible for scheduling generation in its
        scheduling (e.g., day-ahead, hour-ahead) markets, for determining hourly market
        clearing prices for its market, and for settlement and billing for suppliers and UDCs
        using its market
Power Flow
        a generic term used to describe the type, direction, and magnitude of actual or
        simulated electrical power flows on electrical systems
Price-Flexible Demand
        refer to Demand Bid
Price-Inflexible Demand
        customer demand bid into the PX that does not have a maximum price threshold. This
        load will be committed in the PX auction process irrespective of the level of the market
        clearing price


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Qualified Facilities (QFs)
        an individual (or corporation) who owns and/or operates a generation facility, but is not
        primarily engaged in the generation or sale of electric power. QFs are either renewable
        power production or cogeneration facilities that qualify under Section 201 of PURPA


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Ramping
        changing the loading level of a generator in a constant manner over a fixed time (i.e.
        ramping up or ramping down). Such changes may be directed by computer or manual
        control
Real-Time Market
        The competitive generation market controlled and coordinated by the ISO for arranging
        real-time imbalance power
Redispatch
        the readjustment of generation output schedules or demand side management,
        generally to relieve transmission congestion
Regional Transmission Group (RTG)
        a voluntary organization of transmission owners and users who act as a forum to report
        to the FERC on the implementation of open access to transmission systems
Regulation
        the portion of a generating unit's unloaded capability which can be loaded, or loaded
        capability which can be unloaded, in response to Automatic Generation Control signals
        from the ISO's energy management system control computer. Regulation is used to
        provide control area balancing, frequency bias and time error correction
Regulating Reserve
        Sufficient spinning reserve, immediately responsive to automatic generation control
        (AGC) to provide sufficient regulating margin to allow the control area to meet North
        American Electric Reliability Council (NERC) Control Performance Criteria
Reliability
        the degree of performance of the elements of the bulk electric system that results in
        electricity being delivered to customers within accepted standards and in the amount
        desired. May be measured by the frequency, duration, and magnitude of adverse effects
        on the electric supply.
Reliability Criteria
        principals used to design, plan, operate, and assess the actual or projected reliability of
        an electric system.
Reliability Must Run (RMR) Generation
        the minimum generation (number of units or MW output) required by the ISO to be on
        line to maintain system reliability
Restructuring Trusts
        the two tax-exempt public benefit trusts established by the CPUC to provide for the
        design and development of hardware and software systems for the Power Exchange
        and the Independent System Operator
Retail Load
        the load that is the responsibility of a retailer
Retail Sales
        the electric energy sales made by a retailer to end-use customers
Retailer
          an entity who purchases power on behalf of end-use customers. This can be a
          marketer, broker, scheduling coordinator, buyer, or a UDC
Revenue Requirement
          The revenue level required by a utility to cover expenses made on an investment, while
          earning a specified rate of return on the investment
Run or Lose Generation
          hydro generation that has no storage capacity and if backed down, would spill; also
          hydro generation where storage capacity is exceeded and spilling even though the
          generators are at full output; and hydro generation where storage capacity is
          inadequate to prevent loss of hydro energy either immediately or during the forecast
          period if hydro output is reduced


[top]
Schedule Imbalance Deviation
          the deviation between metered and scheduled delivery or consumption
Scheduling Coordinator
          an entity authorized to submit to the ISO a balanced generation or demand schedule on
          behalf of one or more generators, and one or more end-users customers
Scheduling Market
          the pre-planning of generation and load schedules in advance of delivery. This is
          typically done one full working day in advance and is often called pre-scheduling
Self-Provided Service
          the provision (by ownership or contract) to the ISO of all or a portion of a Scheduling
          Coordinator's pro rata obligation to supply an ancillary service
Seller
          an entity that produces or arranges for the production of electrical energy
Settlement
          a financial settlement process (billing and payment) for products and services
          purchased and sold; each settlement will involve a price and a quantity
Spinning Reserve
          the portion of unloaded synchronized generating capacity, controlled by the ISO, which
          is capable of being loaded in 10 minutes, and which is capable of running for at least
          two hours
Spot Market
          refer to Real-Time Market
Stage 1
          A Stage 1 emergency is declared when the ISO determines there will be an operating
          reserve shortfall within the next two hours. It is less severe than a stage 2 or stage 3
          emergency. Stage 1 does not require interruption of service to customers.
Stage 2
          A Stage 2 emergency is declared anytime there will be a serious operating reserve
          shortfall (less than 5%) within the next two hours. At this stage, interruption of service to
          some or all of selected customers is required. Many customers have agreed to be
          interrupted in case of a stage 2 emergency. These customers receive a reduced rate for
          their electrical service as compensation for their agreement to be curtailed.
Stage 3
          A Stage 3 emergency is declared anytime there will be a critical operating reserve
          shortfall (less than 1 1/2%) within the next two hours. Stage 3 is the most severe
          emergency and indicates that, without significant ISO intervention, the electrical system
          is in danger of imminent collapse. Involuntary curtailment of service to consumers (i.e.
          "rolling blackout") is required to maintain operating reserve above 1 1/2%.
Supervisory Control and Data Acquisition (SCADA)
          a computer system that allows an electric system operator to remotely monitor and
          control elements of an electric system
System Reliability
          refer to Reliability


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Tariff
          a document filed with the appropriate regulatory authority specifying lawful rates,
          charges, rules, and conditions under which the utility provides services to parties. A tariff
          typically includes rates schedules, list of contracts, rules and sample forms
Transition Period
          the period of time to allow IOUs and Local Publicly-Owned Utilities an opportunity to
          continue to recover costs for generation-related assets and obligations that may not be
          recoverable in market prices in a competitive generation market. The period was
          defined as January 1, 1998 through December 31, 2001
Transmission Congestion
          the condition that exists when market participants seek to dispatch in a pattern which
          would result in power flows that cannot be physically accommodated by the system.
          Although the system will not normally be operated in an overloaded condition, it may be
          described as congested based on requested/desired schedules
Transmission Congestion Contract (TCC)
        a financial instrument that provides a hedge against congestion price differences
        between zones
Transmission Owner
        an entity owning transmission facilities or having contractual rights to use transmission
        facilities that are used to transmit and distribute power from suppliers to UDCs


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Unbundled Rates
        separate line-item charges for generation, transmission, distribution, and other services
        and programs
Unit Commitment
        the process of determining which generators will be brought on-line to meet load and
        provide ancillary services for the next scheduling period
Unplanned Outages
        outages of generation, transmission, or distribution facilities not noticed in advance to
        the ISO
Utility Distribution Company (UDC)
        a distribution wires business and a regulated retailer who serves end-use customers


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WSCC
        Western Systems Coordinating Council
Wheeling
        the use of the transmission facilities of one system to transmit power and energy by
        agreement for retail or wholesale customers on another system with a corresponding
        wheeling charge
Wheeling-Out
        an energy transaction originating within and flowing through the ISO transmission grid
        to a designation outside of the ISO transmission grid
Wheeling-Through
        an energy transaction flowing through the ISO transmission grid whose origination and
        designation is outside of the ISO transmission grid
Wholesale Sales
        electric energy sales made through the ISO transmission grid to parties who are not
        end-users
ISO / PX Acronyms

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[terms][bottom]



2D
        Two Dimension (graph)
3D
        Three Dimension (graph)
4G/SQL
        Fourth-Generation Language with Software Query Language interface
4GL
        Fourth-Generation, Non-procedural based Language


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ABB
        ABB Power T & D Company - System Control Division (Asea Brown Boveri)
ACC
        Area Control Center
AC/ED
        Assigned Commissioner; The Energy Division (Formerly CACD)
ACE
        Area Control Error
ACH
        Automated Clearinghouse
ACV
        At-Completion Cost Variances
ADR
        Alternative Dispute Resolution
AFUDC
        Allowance for Funds Used During Construction
AGC
        Automatic Generation Control
ANSI
        American National Standards Institute
API
        Application Program Interface
APS
        Arizona Public Service
AS
        A/S Ancillary Services
ASCII
        American Standard Code for Information Interchange
ASMS
        Ancillary Service Management System
ATM
        Asynchronous Transfer Mode
ATC
        Available Transfer Capability
ATP
        Acceptance Test Procedure


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BBS
        Balance of Business Systems; also Bulletin Board System
BS
        Business Systems
BSB
        Bidding, Scheduling, Settlements and Billing
BS/EC
        Batch Scheduler/Execution Control
BT
        British Telecommunications PLC
BPR
        Business Process Reengineering


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CA
        Contingency Analysis; also Customer Aggregators
CACD
        Commission Advisory & Compliance Division(replaced by AC/ED)
CBC
        California Building Code
CCAPI
        Control Center Application Program Interface
CCIT/ITU
        The International Telegraph and Telephone Consultative Committee/International
        Telecommunications Union
CCR
        Coordinating Commissioner Ruling
CDA
        Common Data Access Method
CE
        Connected Entity
CEC
        California Energy Commission
CEQA
        California Environmental Quality Act
CERCDC
        California Energy Resources Conservation & Development Commission
CFE
        Communications Front End
CGI
        Common Gateway Interface
CIM
        Computer Integrated Manufacturing, Common Information Model (Part of EPRI's CCAPI
        Guidelines)
CL
        Capacity Loss
CMS
        Congestion Management System
COA
        Chart of Accounts
CPNC
        Certificate of Public Convenience and Necessity
CPUC
        California Public Utility Commission
CSI
        Computing Services Infrastructure
CT
        Current Transformers
CT/VT
        Current Transformers/ Voltage Transformers
CTC
        Competition Transition Charge
CV
        Cost Variances


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DA
        Day Ahead Scheduling
DA
        Direct Access Loads- taking service through ISO controlled grid or UDC's distribution
        grid
DAC
        Direct Access Customers
DCOR
        Dispatch Coordinator
DE&S
        Duke Engineering & Services, Inc.
DISI
        Dispatch Integration and Scheduling Implementation (See OSI)
DSOW
        Detailed Statement of Work
DPF
        Dispatcher Power Flow
DTG
        Definition Task Group


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E&Y
        Ernst & Young LLP
EAC
        Estimated Cost at Completion
ECC
        Energy Control Centers
ED
        Economic Dispatch
EDI
        Electronic Data Management
EDM
        Engineering Data
EFT
        Electronic Funds Transfer
EIA
        Electronic Industries Association
EMS
        Energy Management System
EPRI
        Electric Power Research Institute
EWG
        Exempt Wholesale Generator Ex-Post Price (price after consideration of congestion,
        balancing, etc.)


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FAT
        Final Acceptance Test; also Factory Acceptance Test
FCAPS
        Fault Configuration Accounting Performance Security Model
FDDI
        Fiber Distributed Data Interchange
FEP
        Front End Processor
FERC
        Federal Energy Regulation Commission
FPA
        Federal Power Act
FRD
        Functional Requirements Document
FTR
        Firm Transmission Rights


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GA
        Generator Aggregators
GB
        Governing Board
GMM
        Generation Meter Multipliers GMM > 1 decreases system losses DMM < 1 increases
        system losses
GUI
        Graphic Users Interface


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HDC
        Historic Data Collection
HIM
        Historic Information Management
HTM
        Hyper Text Markup language
HTTP
        Hyper Text Transfer Protocol


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IAB
        Internet Activities Board
IANA
        Internet Assigned Numbers Authority
IASP
        Internet Access Service Provider
IAT
        ABB Internal Acceptance Test
ICCP
          Inter Control Center Protocol - OSI 7 Layer
IEC
          International Electrotechnical Commission
IEEE
          Institute of Electrical and Electronics Engineers
IETF
          Intranet Engineering Task Force
IOU
          Investor Owned Utilities
IRTF
          Internet Research Task Force
IPP
          Independent Power Producer
IS
          Interchange Scheduling
ISA
          Instrument Society of America
ISC
          Interchange Scheduling Calculation
ISDN
          Integrated Services Digital Network
ISO
          Independent System Operator; also International Standards Organization
ISO BBS
          ISO Balance of Business Systems
ISO SA
          ISO Scheduling Applications
ISO SI
          ISO Scheduling Infrastructure
ISP
          Internet Service Provider
IS Plus
          Full function Internet scheduling program designed specifically for the deregulated
          energy market
IST
          Integrated Systems Test
ITS
        Interchange Transaction Scheduler


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kV
        Kilovolt


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LADWP
        Los Angeles Department of Water and Power
LAN
        Local Area Network
LCG
        LCG Consulting
LDS
        Local Data Server - Provides meter data to SC and ISO
LF
        Load Forecast
LS
        Loss Sensitivity


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MAN
        Metropolitan Area Network
MCP
        Market Clearing Price
MIPM
        Market Information Publishing Module
MORC
        Minimum Operating Reliability Criteria
MTSA
        Mid-Term Stability Analysis
MW
        Megawatt
MWh
        Megawatt hour
Mvar
        Megavar
Mvarh
        Megavar-hour


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NADH
        North America Digital Hierarchy
NC
        Network Coloring (Network Status Processor)
NAC
        Network Analysis Control
NERC
        North America Electric Reliability Council
NMB
        Network Model Builder
NOPR
        Notice of Proposed Rule Making (issue by FERC)
NYPP
        New York Power Pool - Bidding and Scheduling System


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OASIS
        Open Access Same-Time Information System
OATI
        Open Access Technology International
OCR
        Optical Character Recognition
ODO
        On Demand Obligation for each SC to other control areas
ODBC
        Open Data Base Connectivity
OGM
        Over Generation Mitigation
OLE
        Object Linking and Embedding
OPERM
        Operations Monitoring
OPF
        Optimal Power Flow
OS
        Outage and Operations Schedule
OSB
        California Electricity OverSight Board - 5 members - created to ensure interest of
        Californians
OSI
        Open System Interconnect - CCIT/ITU Seven Layer Model, Operational Scheduling
        Implementation Team
OSF
        Open Systems Foundation
OSI
        Operating Systems Implementation (formerly DISI)


[top]
PA
        Parameter Adaptation
PABX
        Private Automatic Branch Exchange
PCA
        Power Computer Applications Corp.
PDU
        Power Distribution Unit
PF
        Power Factor
PFC
        Penalty Factor Calculation
PG&E
        Pacific Gas & Electric
PLFH
        Forecast of the percent of the load supplied by hydro resources
PLFT
        Forecast of the percent of the load supplied by thermal resources
PLI
        Power Labs, Inc.
PMS
        Power Management system - ISO Dispatch System
POP
        Point of Presence
PR
        Purchasers Representative
PSC
        Perot Systems Corporation
PTI
        Power Technologies, Inc.
PX
        Power Exchange


[top]
QF
        Qualifying Facilities


[top]
REMnet
        Revenue Meter Network
RESOM
        Resource Monitoring
RFC
        Request For Comment (Internet standards documents and IAB proceedings)
RM
        Reserve Monitor
RMR
        Reliability Must Run
RSCDL
        Resource Scheduling
RTG
        Regional Transmission Group
RTU
        Remote Terminal Unit
[top]
SA
        Scheduling Applications
SAT
        Site Acceptance Test
SBS
        ISO Scheduling and Business Systems
SC
        Scheduling Coordinators
SCADA
        Supervisory Control and Data Acquisition
SCE
        Southern California Edison
SCUG
        Scheduling Coordinators User Group
SDLF
        Similar Day Load Forecast
SDG&E
        San Diego Gas & Electric
SE
        System Estimator
SI
        Scheduling Infrastructure
SII
        Scheduled Interruptible Imports for each SC
SMTP
        Simple Mail Transfer Protocol
SNMP
        Simple Network Management Protocol
SONET
        Synchronous Optical Network
SQL
        Software Query Language (relational database standard)
SR
        Supplier Representative
SRS
         Secondary Registration System (Firm Transmission Rights)
SSA
         Static Security Analysis
SSL
         Secure Sockets Layer - encrypted layer of Netscape
SSV
         Security/Stability Validation


[top]
TAA
         Transmission Assessment Applications
TAC
         Trust Advisory Committee
T&D
         Transmission and Distribution
TCC
         Transmission Congestion Contract
TCP/IP
         Transmission Control Protocol/Internet Protocol
TI
         Tenant Improvement
TLF
         Transmission Loss Penalty Factor
TO
         Transmission Owner
TOU
         Time of Use
TLRC
         Transmission Loss Rate Calculation
TRACE
         Transfer Capability Evaluation
TSA
         Transient Stability Analysis
TSIN
         Transmission System Information Network (same as OASIS)
[top]
UC
        Unit Commitment
UCA
        Utility Communications Architecture
UDC
        Utility Distribution Center
UFLS
        Under-Frequency Load Shedding
UPS
        Un-Interruptible Power Supply
UTC
        Universal Coordinate Time
UTS
        Utility Translation Systems


[top]
VGA
        Video Graphics Adapter
VSA
        Voltage Stability Assessment; also Voltage Security Assessment


[top]
WAN
        Wide Area Network
WBS
        Work Breakdown Structure
Wenet
        Western Exchange Network
WEPEX
        Western Power Exchange
WSCC
        Western States Coordinating Council


[top]
X
        X Windows
X.25
        CCITT Communications Protocol - packet switching


[top]
YTD
        Year to Date

				
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