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7/25/2019 WESM Participant Handbook Vol2
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A U G U S T 2 0 1 5
Vol. 2 Trading Operations in the Philippine WESM
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WESMHandbookA Guide to All Members and Applicants of the
Philippine Wholesale Electricity Spot Market (WESM)
The Philippine Electricity Market Corporation (PEMC) provides this document (the Document)
for general information purposes only. The information contained in this Document is correctto the best of PEMCs knowledge at the time of publishing but may change over time. The
Document is reviewed and updated from time to time. If you have further inquiries regarding this
Document, please contact PEMCs Participant Support Section via e-mail at [email protected],
or through telephone at (+632) 631.8734 loc. 229/239.
Disclaimer/Waiver:
All information in this document may still be subject to change after nal verication by the
PEMC. This publication is meant to provide a timely overview of the trading operations in the
WESM. As such, PEMC does not make any representation or warranties as to the completenessor accuracy of the information. PEMC, likewise, accepts no responsibility or liability whatsoever,
for any loss or costs incurred by the reader arising from, or in relation to, any contributions or
assumptions derived from the information.
EDITORIAL TEAM
Phillip C. Adviento
Josephine C. Corpuz
Cerise M. Cabactulan
Eric Nio U. LouisMenachem Reykarl B. Loyola
Katrina A. Garcia-Amuyot
Daisy Jane C. Alfafara
Arnesh Y. Inostro
Theresse Joy V. Calo
LAYOUT ARTIST
Rhlee B. Amojilar
ADVISER
Robinson P. Descanzo
CONTRIBUTORS
Edwin N. Mosa
Arthur P. Pintado
Edward I. Olmedo
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WESM Operations
Introduction
Scheduling and Dispatch in the WESM
WESM Timetable
During Normal Conditions
During Emergency Conditions
Sample Cases of Market Interventions
Market Suspension
Sample Normal Dispatch Process
Load Forecasting
Introduction
Demand Forecasting for Market Projections
Demand Forecast for the Real-time Dispatch Runs
Operational Market Reports
Introduction
Procedure
Daily Operation Reports
Market Participant Interface
Scheduling and Pricing
2
2
2
4
7
7
8
9
9
10
10
11
12
13
13
13
15
17
19
TABLE OF CONTENTS
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WESM OPERATIONS
INTRODUCTION
A clear denition and delineation of responsibilities are necessary to ensure the reliable operation of
the grid, especially with the Market Operator (MO) and the System Operator (SO) being two separateentities.
As a result, the WESM Manual on the Dispatch Protocol was formulated after rigorous discussions
between MO and SO.
The Dispatch Protocol
Clearly establishes the WESM Timetable for the execution of specic processes (WESM Rules 3.4.2
and 10.4.8.1)
Establish scheduling and dispatch procedures to be followed in
Normal Conditions-
Emergency Conditions-that should be consistent with the WESM Timetable and features of the MMS
SCHEDULING AND DISPATCH IN THE WESM
WESM was established as the trading platform of energy transactions.
WESM was also established as the central platform for the dispatch scheduling of generating facilities.
SO is still responsible in the dispatch of generating units at real-time.
MO has the responsibility of forecasting demand, and prepares a Security Constrained Economic
Dispatch (SCED) schedule of generators and loads based on the hourly demand bids and generation
offers.
MO also maintains a Market Network Model (MNM) which shall be used by the Market Dispatch
Optimization Model (MDOM), which shall be able to consider transmission constraints and losses.
Responsibilities in WESMs Scheduling and Dispatch
The MO, SO, and Trading Participants (TPs) are the three entities involved in the scheduling and dispatch of
generating facilities in WESM
MO Responsibilities in Scheduling and Dispatch
Maintenance of the MNM in coordination with the SO
Generation of dispatch schedules using the MDOM
Transmittal of dispatch schedules to the SO for implementation
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SO Responsibilities in Scheduling and Dispatch
Submission of overriding constraints to ensure the reliable operation of the grid
Outage Schedule - List of Equipment (e.g. generators, lines, transformers, breakers, etc.) that will be
out of service for a certain dened period.
Contingency List - List of Equipment enlisted for contingency analysis (as per Grid Code: N-1
Contingency Requirement).
Security Limits - List of Generators and Branch Groups that will have its limits overridden for security
purposes (e.g. MRU/testing/commissioning).
Transmission Limits - list of transmission capacities of lines and transformers to be consider in the
scheduling process
Implementation of the dispatch schedules provided by MO
Issuance of deviation report to MO (actual vs. schedule)
TP Responsibilities in Scheduling and Dispatch
Submission of bids and offers to WESM consistent with the WESM Timetable
Comply to the dispatch instructions of SO
Figure 1. Scheduling and Dispatch in the WESM
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WESM TIMETABLE
Trading activities in WESM operate at different time frames
Week Ahead Projection (WAP)
Day Ahead Projection (DAP)
Hour-Ahead or Real-Time Dispatch (RTD)
Real-Time Ex-post (RTX)
WESM TIMETABLE: WAP
The Week-Ahead Projection (WAP) gives indicative hourly dispatch schedules and spot prices for the
next seven days.
Its results serve as a guide to the following entities:
Participants when bidding transactions in the market for the next seven days
SO in the determination of the cost impact of planned outages
It considers the following information, which shall be used by the Market Management System (MMS) to
generate schedules:
Demand bids and energy offers from Trading Participants
Demand forecasts
Outage Schedules
Security Limits
Latest available system snapshot
WAP is executed every day to produce results for the next seven days.
WAP is executed at 0900H of each trading day
D-1 D D+1 D+2 D+3 D+4 D+5 D+6 D+7 D+8 D+9
TRADING DAYS
Execut on oWAP at Day D
Study Period of WAP at Day D
(From D+1 to D+7)
4
4
TRADING DAYS
4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19
WAP Results and Analysis
Coordination with SOPrior to 0900H, thefollowing activities aremade for D+1 to D+7 Gathering of weather
forecasts Preparation of demand
forecasts Submission or revision
of bids and offersThe latest information provided by
SO prior to 0900H shall be used System Snapshot Outage Schedule Security Limit Transmission Limit Contingency List
Publish WAPResults in WEB
WAP Execution
Figure 2. WESM Timetable: WAP
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TRADING DAYS
4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19
DAP Results Analysis Coordination with SO isdone up until 1 hour after the DAP execution
The latest information provided by SO prior to each DAP run shall be used The latest bids and offers shall be used. Submission or revision of bids and offers relevant to the succeeding hours can
be made prior to the execution of the DAP run. Demand forecasts for each of the succeeding hours evaluated by the DAP run should be provided prior to its execution.
Revisions may still be implemented prior to the DAP run
0800H DAP
DAP Results AnalysisCoordination with SO
1200H DAP 1600H DAP0400H DAP
5
5
WESM TIMETABLE: DAP
The Day-Ahead Projection (DAP) gives indicative hourly dispatch schedules and spot prices covering the
succeeding hours of the day up to the end of the following day.
It allows the SO to prepare a more accurate contingency plan for the relevant intervals.
It considers the following information, which shall be used by the Market Management System (MMS) togenerate schedules
Demand bids and energy offers from Trading Participants
Revisions of bids and offers for consideration in the DAP run can be done until a cut-off time
(four hours prior to the trading hour)
Demand forecasts
Outage Schedules
Security Limits
Latest available system snapshot
DAP is executed every four hours to produce results for the succeeding hours until the end of the
following day.
DAP Study Period
DAP Run atCurrent Day D
Study Horizon
From To
0400H 0500H of D 2400H of D
0800H 0900H of D 2400H of D
1200H 1300H of D 2400H of D+1
1600H 1700H of D 2400H of D+1
2000H 2100H of D 2400H of D+1
2400H 0100H of D+1 2400H of D+1
Figure 3. WESM Timetable: DAP
Table 1. DAP Study Period
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WESM TIMETABLE: RTD
The Hour-Ahead or Real-Time Dispatch (RTD) publishes schedules that shall be implemented by SO,
and spot prices that shall be used in the settlement of market transactions.
The RTD schedules are subject to the nal screening of SO before a dispatch instruction is issued to a
Trading Participant.The dispatch schedule is the target MW loading of all Trading Participants at the end of a trading interval.
RTD is executed every 55th minute of the hour.
WESM TIMETABLE: RTX
The Real-Time Ex-Post (RTX) represents the duration of the trading interval.
It is not used by the SO in the dispatch implementation since it is merely used for price discovery, in
which its results represent the actual events that transpired for the duration of the trading interval
Its results are used to settle imbalances in the market (schedule vs. actual)
RTX is executed every 1st minute of the hour
40 50 00 10 20 30 40 50 0 0 10 20 30 40 50 00 10 20 30 40
HH-2 HH-1 HH HH+1
Gate Closure for
bids and offers
Dispatch Implementation for HHto meet Target Schedule
Trading Interval HH
Trading Interval HHRTD Execution for
Trading Hour HHThe latest information
provided by SO prior to each
RTD run shall be used
Transmit RTD Schedules and
MOT to SO
Publish results in WEB
40 50 00 10 20 30 40 50 0 0 10 20 30 40 50 00 10 20 30 40
HH-2 HH-1 HH HH+1
Trading Interval HH
RTX Execution for
Trading Hour HHThe latest information
provided by SO prior to each
RTX run shall be used
Figure 4. WESM Timetable: RTD
Figure 5. WESM Timetable: RTX
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WESM Rules 6.3.1.1 states that an emergency condition is a situation which has an adverse effect on
electricity supply or which poses a signicant threat to system security
SAMPLE CASES OF MARKET INTERVENTION(06 FEBRUARY 2012: 1200H TO 1400H)
8
8
Activities Procedure in the Dispatch ProtocolResponsible Group
MO SO
System Emergency and Restoration -- x x
Market Suspension and Intervention Appendix B.2 x
EMS Disaster Recovery Procedures -- x
MMS Disaster Recovery Procedures -- x
Report and Documentation of Events -- x x
Emergency Market intervention was declared due to tripping
of several power plants affected by magnitude 6.9 earthquake
in the Visayas Region.
The intervention was initiated by the Visayas
System Operator.
The Market Intervention Report prepared by the National Grid
Corporation of the Philippines (NGCP) is attached.
(WESM Rules clause 6.3.1.2 (c))
Table 4. WESM Tasks During Emergency System Conditions
Figure 6. Sample Case: Market Intervention
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MARKET SUSPENSION(14 JULY 2010)
SAMPLE NORMAL DISPATCH PROCESSFOR THE 0900H TARGET TRADING INTERVAL (08:01 AM UNTIL 09:00 AM)
FOR THE 0900H TARGET TRADING INTERVAL (08:01 AM UNTIL 09:00 AM)
9
9
Pursuant thereto and by reason of the power sys-
tem disturbance brought by typhoon BASYANG,
the commission has suspended the operations of
the WESM effective on 14 July 2010 at 1200H, as
contained in the notice of Market Suspension is-
sued by this commission which is attached hereto
and made an integral part hereof as Annex A
Figure 8. Sample Normal Dispatch Process
Figure 7. Sample Case: Market Suspension
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LOAD FORECASTING
INTRODUCTION
Forecasting is a process of predicting market condition using historical data. In the WESM, we predict the
energy to be consumed in a certain area for a specic trading interval incorporating historical data, real timegrid system status, weather condition and events.This process is known as Load Forecasting. The provision
of load demand is necessary for the calculation of market prices and dispatch schedules. It is an integral
requirement of the market dispatch optimization model. The WESM Rules provide the calculation of market
projections and real-time schedules which require accurate load demand forecast information. The load
forecasting in the market has three time frames; namely hour-ahead, day-ahead and week-ahead
forecasting.
Hour-Ahead Forecast
The process of forecasting the load energy demand for next top of the hour. It is conducted every hour anduses the latest real time grid system status, weather condition and events. The Ex-ante (Real-Time Dispatch
or RTD) utilizes this forecast.
Day-Ahead Forecast
The process of forecasting the load energy demand for the next day and is being updated every four hours
to accurately reect the near real time load energy demand. The Day-Ahead Projection (DAP) utilizes this
forecast.
Week-Ahead Forecast
The process of forecasting the load energy demand for the next seven days. It is being updated daily. The
forecast output is an indicative gure for Market Participant bidding strategy and generator maintenance
scheduling. The Week-Ahead Projection (WAP) utilizes this forecast.
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Week-Ahead and Day-Ahead Demand Forecasts
Hourly Demand Forecasts for each Forecast Area from the current day to the next seven days shall be
determined by the Market Operator using the Similar Day Load Forecast (SDLF) module of the MarketManagement System (MMS).
The Demand Forecasts obtained in the week ahead forecast shall be used as Input Demand Forecasts
to obtain the WAP and the DAP.
The summation of the Net Load Forecast plus the losses computed for a Forecast Area after the
optimization process in the relevant market run (i.e. WAP or DAP) constitutes the Final Demand
Forecast for that Forecast Area.
DEMAND FORECAST FOR MARKET PROJECTIONS
Figure 9. SDLF Methodology Load Forecasting
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Hour-Ahead Forecasts
Demand Forecasts for the next hour in each Forecast Area shall be determined by the Market Operatorusing the Load Predictor (LDP) module of the Market Management System.
The Demand Forecasts obtained in the hour-ahead forecast shall be used as Input Demand Forecasts toobtain the Real-Time Dispatch (RTD).
The summation of the Net Load Forecast plus the losses computed for a Forecast Area after theoptimization process in the relevant RTD run constitutes the Final Demand Forecast for that ForecastedArea.
DEMAND FORECAST FOR THE REAL-TIME DISPATCH RUNS
Figure 10. LDP Methodology Load Forecasting
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OPERATIONAL MARKET REPORTS
INTRODUCTION
The Market Operator (MO) regularly publishes operational market reports to the public required by the
WESM Rules in accordance with the WESM Timetable. Using a web-based report system, operational
market reports are easily made available online to the trading participants and the general public.
PROCEDURE
Market Participant Interface (MPI)
Registered Trading Participants (TPs) shall have access to the Market Management System (MMS) or
WESM through a Market Participant Interface (MPI). The MPI is connected to the MMS through the world-
wide web. The MPI shall be used by all TPs to bid and retrieve market information from the WESM-MMS.The MPI may be accessed through: www.mms.wesm.ph
Information to be Published
System Messages
The System Messages display is the primary link between the Trading Participant and the WESM
Market Operator. The TP is notied of all kinds of system events such as report publication and
availability, market suspension or re-activation, and the like.
System Messages are classied as:
Normal: These are generally system-generated messages displayed in GREEN-
Urgent: Urgent Messages are displayed in BLUE-
Emergency: Emergency Messages are displayed in RED-
Market Status Display
The Market Status Display shows the status of Hourly Energy Markets e.g. if the Market is still Open
or had already Closed.
Market Participant Interface Data
Using MPI, the Trading Participants will be able to access the following information:
Market Participant Registration-
Bids and Offers Data-
Market and System Advisories-
Updates on Market Prices, Dispatch and Pre-dispatch schedules-
Demand Forecasts-
Real-Time Ex-post (RTX) Prices-
Market Participant Specic, All Market Participants, and ADHOC Reports-
Settlement (Prudential Requirements)-
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WESM Website
The WESM website contains technical information on the WESM as well as all recent WESM development
and announcements.
The WESM website is: www.wesm.ph
Information to be Published
All Market information required to be published by the Market Operator under the WESM rules shall be
made accessible to the WESM members, DOE, ERC and the general public through the WESM website.
Access to the Market information other than the WESM website shall be the responsibility of the parties
concerned.
Systems and Procedures
The following are standard operating procedures that are to be observed during WESM operation:
WESM Timetable-
WESM Operating Procedures during Normal System Condition-
Emergency Procedures jointly developed by System Operator and Market Operator.-
Detailed procedures developed by the System Operator in relation tocompetitive tendering-
process for Ancillary Services.
Dispatch and pricing procedures in the event of load shedding and excess generation developed-
in consultation with the System Operator.
Other WESM Reports
The following are the relevant reports that are to be prepared as required by the different provisionsof the WESM rules:
Findings and recommendation of the PEM auditor regarding changes in WESM rules consequent-
to annual audit, review, check, or otherforms of review.
Suspension notice issued to a WESM participant. It shall also be published in a newspaper of-
general circulation, as soon as practicable.
Revocation of suspension issued to a WESM Participant. It shall also be published in a-
newspaper of general circulation, as soon as practicable.
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OPERATIONAL MARKET REPORTS
DAILY OPERATIONS REPORT
The Market Operator shall closely monitor Market Operations on an hourly basis within the trading day.
Likewise, the MO shall record and verify all signicant events that are not recorded in the MMS. The MO-
DOR shall be reviewed and approved by the Operations Unit Head.
At the end of every trading day, the Market Operator shall prepare a report containing the summary of its
operations on an hourly basis of the previous day which includes the contents of the Post Dispatch Report.
The following are the daily Operations report being published by the Market Operator:
WESM WEB SITE (https://www.wesm.ph)
WAP_DAY_LUZON
WAP_DAY_VISAYAS
NEXT_DAY_LUZON
NEXT_DAY_VISAYAS
PREVIOUS_DAY_LUZON PREVIOUS_DAY_VISAYAS
RTD Marginal Plant
RTX Marginal Plant
Market Participant Interface (MPI)
RTD OUTAGE SCHEDULE
RTX OUTAGE SCHEDULE
PEN REPORT
DAP Pmin
PSM REPORT-Hourly Price Substitution occurrence if any for RTD and RTX
Next Week Summary (NWS)
A summary of the results of WESMs Week-Ahead Projection (WAP).
The Next Week Summary (NWS) report contains a daily summary of the following results for each of the
trading days included in the relevant WAP workow run.
Demand and Reserve Requirement1.
Market Participant Bids and Offers Summary2.
Energy and Reserve Schedules3.Market Price Summary4.
The WAP is executed daily to project the hourly results for the next seven days (e.g. Monday WAP run
contains hourly results from the next day (Tuesday) up to the following Monday).
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Next Day Summary (NDS)
A summary of the results of WESMs Day-Ahead Projection (DAP).
The NDS report contains a summary of the following results projected for the following day as obtained in the
relevant DAP workow run.
Demand and Reserve Requirement1.
Market Participant Bids and Offers Summary2.
Energy and Reserve Schedules3.
Market Price Summary4.
The DAP is executed every four hours to project the hourly results from the next hour of the same day, up
until the end study period of a particular run (some DAP runs end at 2400H of the same day while other DAP
runs end at 2400H of the next day). The following table shows the study periods of the different DAP runs.
Previous Day Summary
A summary of the results of WESMs Hour-Ahead or Real-Time Dispatch (RTD) and Real-Time Ex-Post
(RTX)
The Previous Day Summary (PDS) report contains a summary of the following results that transpired
during the previous day involving the RTD and RTX workows in the market.
Demand and Reserve Requirement1.
Market Participant Bids and Offers Summary2.
Energy and Reserve Schedules3.
Market Price Summary4.
The information contained herein are those obtained at real-time for the RTD and RTX workows, and it
does not reect any pricing corrections that may be involved in cases of pricing errors.
The Market Operator regularly publishes market reports to the public that contains a summary of the
markets results, primarily involving the RTD and RTX.
DAP RUN FROM TO
0400H 0500H of DAY D 2400H of DAY D
0800H 0900H of DAY D 2400H of DAY D
1200H 1300H of DAY D 2400H of DAY D+1
1600H 1700H of DAY D 2400H of DAY D+1
2000H 2100H of DAY D 2400H of DAY D+1
2400H 0100H of DAY D+1 2400H of DAY D+1
Table 5. DAP Runs
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OPERATIONAL MARKET REPORTS
Marginal Plants
The Marginal Plant (MP) data presents information on the hourly Marginal Plants and their corresponding
price offers in the market.
The MP is the generating unit or plant whose price offer corresponds to the system marginal price for a given
trading interval.
In an unconstrained system, the market price is set by one MP (i.e., the system marginal price). This price is
adjusted for each node to consider transmission losses and/or congestion costs to come up with a resulting
value called the Locational Marginal Price (LMP).
Where the system is constrained, the relevant ows of electricity are affected as the line limitations arising
from the congestion may impede the supply of cheaper electricity from one area to another. In such cases,
there may be more than one MP setting the marginal price for the different nodes on either side of the
constraint.
Available Market Data in the WESM Website
The following list shows a variety of market information made available to the general public in the WESM
public website.
Market Bids and Offers1.
Market Prices and Schedules2.
Ex-ante and Ex-post LWAP3.
Market Re-Run Results4.
Marginal Plants5.
Administered Price6.HVDC Schedule7.
Net Settlement Surplus8.
Must-Run Unit Generation Price Index9.
Price Substitution Methodology for Congestion10.
Daily PEN-MRR-PSM-AP Summary11.
Final Market Prices12.
MARKET PARTICIPANT INTERFACE
The results of the Real Time Dispatch (RTD and RTX) shall be published in the Market Participant Interface(MPI). The following information shall be published (for each Resource of a Trading Participant)
Other system data that will be published includes the following:
Total energy dispatched
Total dispatchable load
Total system losses
Locational Marginal Prices
Information RTD RTX
Energy Dispatch TargetActual Energy / Delivered /
Consumed
Nodal Price Ex-Ante Price Ex-Post Price
Table 6. RTD & RTX Results Published in the MPI
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Publication of Results
The results of the Real Time Dispatch shall be published in accordance with the WESM timetable.
The results of the Real Time Dispatch shall be published in the Market Participant Interface (MPI) and
correspondingly submitted to the System Operator on the following schedules:
RTD Outage Schedule
The RTD Outage Schedule data presents information on the hourly Outage Schedules for the RTD run for
the 24-hour interval within a trading day.
RTX Outage Schedule
The RTX Outage Schedule data presents information on the hourly Outage Schedules for the RTX run for
the 24-hour interval within a trading day.
PEN Report
The PEN Report data presents information on the summary of all the Pricing Error Notice (PEN) issuedwithin the trading day.
DAP Pmin
The DAP Pmin data presents information on the computation of the total Pmin of the generators resulted
from the 1600H DAP run of the trading Day. It aims to see whether there shall be a possibility of an over
generation for the next trading day.
PSM Report
The PSM Report data presents information on the hourly price substitution occurrence if any for RTD andRTX.
Process Study Horizon Execution Frequency
RTD Results Publication 1 Hour-aheadHourly, at the start of Trading
Interval
RTX Results Publication 24 Hours of the previous Day 1200H of the following Day
Table 7. RTD & RTX Results Schedule in the MPI
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OPERATIONAL MARKET REPORTSSCHEDULING AND PRICING
Scheduling and Dispatch upon Establishment of WESM Operations
WESM was established as the central trading platform for the scheduling, dispatch, and net settlement of
generating facilities and loads in grids with WESM operations.
The Market Operator (MO), System Operator (SO), and Trading Participants (TPs) are the three entities
involved in the scheduling and dispatch of generating facilities in WESM.
The SO is responsible for the dispatch of generating units at real-time.
The MO has the responsibility of forecasting demand and the scheduling of generators and loads
based on hourly generation offers and demand bids through a Security-Constrained Economic Dispatch
(SCED).
The SCED of generators and loads are obtained using WESMs MDOM, which utilizes the MNMmaintained by the MO. As such, pricing and scheduling calculations are able to consider transmission
losses and constraints.
TPs are responsible for the following:
Submission of generation offers and/or demand bids.
Comply with the dispatch instructions.
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USEFUL CONTACTS
Philippine Electricity Market Corporation
Participant Support Section9F Robinsons Equitable Tower, ADB Avenue
Ortigas Center, Pasig City, Philippines 1600
Tel. No.: (+632) 631.8734 loc. 239 / 229 / 220 / 302
Facsimile: (+632) 636.0802 / 634.0985
Email: [email protected]
Department of Energy
DOE Information Center
Information Technology & Management Services
Energy Center, Merritt RoadFort Bonifacio, Taguig, Philippines 1201
Tel. No.: (+632) 840.2120
Email: [email protected]
National Electrifcation Administration
57 NEA Building, NIA Road, Government Center
Diliman, Quezon City, Philippines 1001
Tel No.: (+632) 929.1909 local 124
Facsimile: (+632) 929.2171
National Grid Corporation of the Philippines
Quezon Avenue corner BIR Road
Diliman, Quezon City, Philippines
Trunk-line (connecting all Departments): (+632) 981.2100
Energy Regulatory Commission
Pacic Center Building, San Miguel AvenueOrtigas Center, Pasig City, Metro Manila, Philippines 1600
Tel. No.: (+632) 914.5000 local 114
Facsimile: (+632) 631.5816
Email: [email protected]