Bidding and Dispatch

Description

All Participant Submit Energy and FCAS bids submission methods (FTP, API, Markets Portal Web UI and File Upload) leverage the single submit bids JSON format.

The format is enhanced to support the additional attribute data for BDU Energy and FCAS bids. For more details, see Bidding submissions. The modified format supports backward compatibility. 

Enhance Bid format for BDU:

Energy bids

Supports a new conditional direction indicator (LOAD, GEN) allowing submission of separate energyBids object and energyPeriods arrays (10 price, availability, and associated parameters) for the Load side and Generation side of the BDU (20 in total). This field is mandatory for BDU Energy and Regulation FCAS bid submissions.

For non-BDU, the attribute is optional and may be provided. It is optional to support backward compatibility. If provided, validation is performed as per allowable combination.

Contingency FCAS

Offers unchanged (single FCAS enablement - 10 bands) with variation the four trapezium period parameters support provision of positive and negative numeric values (currently positive only).

Regulation FCAS

Supports a new optional direction indicator allowing submission of separate fcasBids array and fcasPeriods arrays (10 price, availability and associated parameters) for the Load side and Generation side of the BDU (20 in total).

Submit bids response

Formats remain unchanged, existing attributes support new error BDU responses.

Submit Bids, Get Bid(s) Get Submission(s) API requests and responses to support the extended JSON format for BDU, syntax/schema/business validation for the amended BDU Bid submission format.  

Backward compatibility for non BDU.

Participant file server (FTP protocols) to support extended JSON format for BDU i.e., syntax/schema/business validation for the amended BDU Bid submission format. 

Backward compatibility for non BDU.

Energy & FCAS 5min Bids web portal view/modify/submit (UI) and file upload functionality support for BDU Energy and FCAS bids.

Enhance the existing Market Reports and Notices to support the introduction of the new IRP participant category and BDU generally described as:

1. Energy and FCAS Bid related reports to accommodate the new BDU related attributes - 20 price and availability bands including associated parameters.
2. Variable Dispatch and Pre-dispatch reports inclusion of BDU Energy Targets (negative and positive), new summations/calculations at regional and DUID level.
3. MT PASA DUID Availability report supports provision of IRP MT PASA offer(s).

MT PASA Offers support submissions from Integrated Resource Providers (IRP) and DUID type BDU.

IRP offers leveraged in PASA modelling.

Data Interchange and MT PASA DUID availability report support of IRP offer(s).    

PASA calculations (processing) and outputs include BDU generation PASA related data (BDU Load PASA availability excluded). No change to formats.

Uplift Markets Portal > EMMS > Market Info interfaces (View Market Summary, View Dispatch and View Pre-dispatch) as per the current web portal framework

Extend support to include and display IRP and BDU related details:

• Dispatch, Price and Demand values in calculations and summations.
• Fuel Mix and Renewable Penetration
• Average Price and 7-Day Outlook values in calculations and summations.

Description

Object

String in date format
Must be a valid date.
The effective date for this bid.

Format:
yyyy-mm-dd or yyyy-mm-dd 00:00:00
For example,
2021-04-23
2021-04-23 00:00:00

Dispatchable Unit identifier recorded in AEMO's
systems.

Must be upper case
maxLength: 10

Mandatory for BDU submissions (excludes Contingency FCAS); optional for all other unit types. To indicate no value, remove the entire attribute. Validation performed if provided.

See Direction Field Enumeration and Use table for allowable enumerated values and use. type: string maximum 15, format: upper case.

For BDU, direction expresses if associated energyBids and energyPeriods reflect the LOAD or GEN side of the BDU.

The band price. Required.

Type: number.

Format: multiple of: 0.01 e.g. 0.01, etc.

For all unit types prices are 0.00 or positive.

Only valid for fast-start units. If not provided, the unit is treated as slow start, and all values in the data model default to null.

Fast-Start Inflexibility Profile

Properties: minimumLOAD, t1, t2, t3, t4

Required: minimumLOAD, t1, t2, t3, t4

For BDU and semi-scheduled generating units remove the entire attribute (must not be provided).

Represents the maximum energy available from a

constrained Plant in the Trading Day

Only relevant to the Energy Service Type

Cannot be negative

Expressed in MWh/day

minimum: 0

maximum: 999999

For BDU remove the entire attribute (must not be provided).

Required for rebids, fixed LOAD, and low ramp rates Properties: reason, eventTime, awareTime, decisionTime, category

For BDU, if supplied for direction LOAD and GEN, the values must be identical (single provision of rebidExplanaton for LOAD and GEN acceptable)

Description

Mandatory for energy bids only.
An array of 288 trading periods from 4:05 am to 4:00 am. Required for an energy submission, type: array, format: minimum items: 288, maximum items: 288

The 5-minute trading interval from 4:05 am to 4:00 am.

Required for energyPeriods, mnspPeriods, and fcasPeriods, type: integer minimum item: 1, maximum item: 288, format: 1, 2, 3...288

Maximum availability for a period, integer minimum 0, format: whole numbers, value: megawatts.

For BDU for each direction (LOAD and GEN) integer minimum 0, format: whole numbers, value: megawatts.

Rate of change up - The maximum rate of increase for the unit. Required for energyPeriods and mnspPeriods, type: integer minimum 0, format: whole numbers, value: megawatts.

For BDU for each direction (LOAD and GEN) integer minimum 0, format: whole numbers, value: MW/min

Rate of change down - The maximum rate of decrease for the unit. Required for energyPeriods and mnspPeriods, type: integer maximum 0, format: whole numbers, value: megawatts.

For BDU for each direction (LOAD and GEN) integer minimum 0, format: whole numbers, value: MW/min

The unit's capability including any capability potentially available in 24 hours, including the offered availability. Required for energyPeriods, mnspPeriods, type: integer minimum: 0, format: whole numbers, value: megawatts.

For BDU for each direction (LOAD and GEN) integer minimum 0, format: whole numbers, value: megawatts.

Fixed unit output, in MW. Must be 1MW or greater.

For BDU provide a single (1) fixedLoad for LOAD and GEN (direction) - remove the entire attribute for direction not provided.

• Direction of GEN, integer minimum 1, format: whole numbers, value: megawatts

• Direction of LOAD, integer minimum 1, format: whole numbers, value: megawatts

The availability for each 10 price bands. Required for energyPeriods, mnspPeriods, and fcasPeriods. Required properties: avail, type: array, minimum: 10 maximum: 10, format.

For BDU for each direction (LOAD and GEN) required properties: avail, type: array, minimum: 10 maximum: 10, format: whole number (0 and positive values for each direction)

Optional for BDU Bid submissions. For non-BDU remove the entire attribute.

For each direction (LOAD and GEN) integer minimum 0, format: whole numbers, value: megawatthours.

Direction of ‘GEN’ indicates the min charge level, and Direction of ‘LOAD’ indicates the max charge level.

Rules:

• If provided defines the min and/or max charge levels for this period, energy limit modelling will be applied.
• If not provided:
  • participants opt in - registered energyLimit (min and/or max) modelling applies.
  • participants opt out - no energy limit modelling applies.

Description

Mandatory for FCAS Offers only.
The collection of one or more FCAS offers. Required for FCAS submissions:
Properties: tradingDate, duid, direction, prices, service,
rebidExplanation, fcasPeriods

The rebidExplanation is only required for a rebid.

String in date format
Must be a valid date.
The effective date for this bid. Expected in the
format:
yyyy-mm-dd or yyyy-mm-dd 00:00:00
e.g.
2021-04-23
2021-04-23 00:00:00

Dispatchable Unit identifier recorded in AEMO's
systems
Must be upper case
maxLength: 10

Mandatory for BDU Regulation FCAS Bid submissions (service = RAISEREG or LOWERREG); optional for all other unit types and BDU Contingency FCAS. To indicate no value, remove the entire attribute. Validation performed if provided.

See 'Direction Field Enumeration and Use' table for allowable enumerated values and use. type: string maximum 15, format: upper case.

An array of 10 prices - Items:price

minItems: 10

maxItems: 10

e.g. [0.00, 0.00, 20.00, …]

For all unit types prices are 0.00 or positive.

One of the FCAS service types. Required for fcasBid. Required properties: one of, RAISE1SEC, RAISE6SEC, RAISE60SEC, RAISE5MIN, RAISEREG, LOWER1SEC, LOWER6SEC, LOWER60SEC, LOWER5MIN, LOWERREG, type: string maximum 10, format: upper case

Required for rebids. Properties: reason, eventTime, awareTime, decisionTime, category.

For BDU, if supplied for direction LOAD and GEN, the values must be identical (single provision of rebidExplanaton for LOAD and GEN acceptable)

Description

Mandatory for FCAS Offers only.

The 5-minute trading interval from 4:05 am to 4:00 am. Required for energyPeriods, mnspPeriods, and fcasPeriods, type: integer minimum item: 1, maximum item: 288, format: 1, 2, 3...288

Maximum availability loading for a period, in whole megawatts minimum: 0
Includes BDU.

The availability for each 10 price bands. Required for energyPeriods, mnspPeriods, and fcasPeriods. Required properties: avail, type: array, minimum: 10 maximum: 10, format.

For BDU for each direction (LOAD and GEN) required properties: avail, type: array, minimum: 10 maximum: 10, format: whole number (0 and positive values for each direction)

For all unit types and Reg FCAS for BDU where direction = GEN, value is minimum FCAS enablement limit this service can supply.  integer minimum 0, format: whole numbers, value: megawatts.

For BDU Regulation FCAS where direction = LOAD value is defined on the negative side. integer maximum 0, whole negative numbers, value: megawatts.

For BDU Contingency FCAS  whole negative or positive numbers, value: megawatts.

For all unit types and Reg FCAS for BDU where direction = GEN, value is the maximum FCAS enablement limit this service can supply. Required for fcasPeriods, type: integer minimum 0, format: whole numbers, value: megawatts.

For BDU Regulation FCAS where direction = LOAD value is defined on the negative side. integer maximum 0, whole negative numbers, value: megawatts.

For BDU Contingency FCAS  whole negative or positive numbers, value: megawatts.

For all unit types and Reg FCAS for BDU where direction = GEN, value is the FCAS low break point. Required for fcasPeriods, type: integer minimum 0, format: whole numbers, value: megawatts

For BDU Regulation FCAS where direction = LOAD value is defined on the negative side. integer maximum 0, whole negative numbers, value: megawatts.

For BDU Contingency FCAS whole negative or positive numbers, value: megawatts.

For all unit types and Reg FCAS for BDU where direction = GEN, value is the maximum FCAS MW output this unit can provide (as per MaxAvail). Required for fcasPeriods, type: integer minimum 0, format: whole numbers, value: megawatts

For BDU Regulation FCAS where direction = LOAD value is defined on the negative side. integer maximum 0, whole negative numbers, value: megawatts.

For BDU Contingency FCAS whole negative or positive numbers, value: megawatts.

Provision in Submit Bid (JSON)

Optional

Optional

Optional

Optional

Optional

Optional

Mandatory

Mandatory

Optional

Mandatory

Mandatory

Optional

Optional

Detail

Your Bid is rejected because the BDU Energy Bid Direction is LOAD for the associated Energy Periods and the Band Availability (1 to 10) is greater than the Registered Maximum Load Capacity. The Band Availability must be less than or equal to the Registered Maximum Load Capacity for the DUID. Or the BDU Energy Bid MLF-adjusted Price Bands must monotonically increase from LOAD Band Availability (1 to 10) to GEN Band Availability (1 to 10). They must increase from lowest to highest.

Your Bid is rejected because the optional Fixed Load value for the Energy Periods is for both directions: LOAD and GEN. For a BDU, if you provide the value, it is only allowed for a LOAD or GEN direction at a time.

Your Bid is rejected because your BDU Energy Bid for a Trading Day must include the Direction: LOAD or GEN. You must separate the Energy Bid and associated Energy Periods for the Load and Generation side of the BDU. Or the MLF-adjusted Price Bands do not monotonically increase for LOAD (1 to 10) and GEN Band Availability (1 to 10). They must increase from lowest to highest.
For details, see  Validation For Bid Convexity And Monotonically Increasing Values.

Your Bid is rejected because the Fast Start Profile associated with the Energy Bid has a value. A Fast Start Profile is not required for a Semi-Scheduled Generating Unit.

Your Bid is rejected because the Fast Start Profile associated with the Energy Bid has a value. A Fast Start Profile is not required for a Bidirectional Unit.

Your Bid is rejected because the Prices Bands must be within the Market Floor Price and Market Price Cap for the DUID

Your Bid is rejected because the conditional Direction value: GEN, LOAD, or BIDIRECTIONAL, associated with the Energy Bid, does not match the allowable combination for the DUID or Bid type, or both.

Your Bid is rejected because you did not enter a Direction value. You must enter a value for BDU Energy and Regulation FCAS Bids with one of the following values: GEN, LOAD, or BIDIRECTIONAL. A Direction value is optional for all other DUID types.

Your Bid is rejected because you did not enter Direction values for both sides. For a Bidirectional Unit (BDU), the Direction value associated with the Energy Bid or Energy Period determines if it is LOAD or GEN. For BDU Energy and Regulation FCAS bids, you must provide a value for both directions, and that value must be different for both sides. A Direction value is optional for all other DUID types and BDU contingency FCAS.  

Your Bid is rejected because energy or FCAS bid parameters are only allowable for a BDU and the DUID is not registered as a BDU.

Your Bid is rejected because you did not enter a value for the Energy Limit for a non-BDU DUID associated with the Energy Bid or Energy Period. The Energy Limit value is optional for BDU DUID Energy Bids.

For more information, see Energy limit validation.

Your Bid is rejected because the BDU value violates the Energy Limit for the Direction in Period ID {2}.

For more information, see Energy Limit in BDU bids

Your Bid is rejected is because the BDU Energy Bid MLF-adjusted prices for effective Bid bands do not increase monotonically from LOAD bandAvail1 to bandAvail10 to GEN bandAvail1 to bandAvail10.
Effective bid bands refer to energy bid band (bandAvail) with non-zero MW capacity limited by bid MaxAvail.

Your Bid is rejected because you have provided the DailyEnergyConstraint field for BDU. This field is only required for energyBids.

Your Bid is rejected because the following conditions are not met:
EnablementMin <= LowBreakPoint.
LowBreakPoint <= HighBreakPoint.
HighBreakPoint <= EnablementMax.

Your Bid is rejected because the Direction value associated with the Energy Bid is LOAD and the FCAS Periods with: Enablement Min, Enablement Max, Low BreakPoint, or High BreakPoint have positive values. The values must be negative or 0.

Your Bid is rejected because the Direction value associated with the Energy Bid is Gen and the Energy Bids with: Enablement Min, Enablement Max, LowBreakPoint, or HighBreakPoint has negative values. The values must be positive or 0.

Your Bid is rejected because the DUID is not registered to provide FCAS service. Please check the DUID's registration details.

Your Bid is rejected because the BDU Energy or FCAS Bid summed values with Max Availability for the LOAD and GEN Direction is greater than the DUID's Registered Maximum Capacity.  Sum of Band Availabilities must be less than or equal to the Registered Maximum Capacity of the DUID for the direction.

You BDU Energy or FCAS Bid is rejected because the 5 field values associated with rebidExplanation array for LOAD and GEN (direction) are not identical.
The validations accepts only a single rebidExplanation for LOAD and GEN fields.

Your Bid is rejected because the sum of the BDU Regulation FCAS Availabilities for Band Availability (1 to 10) for the FCAS Periods for both the LOAD and GEN Direction is greater than the Registered Maximum Capacity of the DUID.

Your Bid is rejected because there is a gap in the combined GEN and LOAD trapezium. When both sides have availability, the individual trapeziums should meet at 0 MW.
For more information, see BDU FCAS pptx

Your Bid is rejected because the GEN and LOAD trapezium must have the same upper angle.
For more information, see BDU FCAS pptx

Your Bid is rejected because the GEN and LOAD trapezium must have the same lower angle.
For more information, see BDU FCAS pptx

Your Bid is rejected because both Low Breakpoint and High Breakpoint for GEN must be 0 when upper angle is less than 90°.
For more information, see BDU FCAS pptx

Your Bid is rejected because both Low Breakpoint and High Breakpoint for LOAD must be 0 when lower angle is less than 90°.
For more information, see Net Trapezium Rule For BDU FCAS Regulation.

Your Bid is rejected because the value provided is less than the registered minimum value. The validation message provides additional information comparing the minimum ramp rate and the value in the Bid.

Your Bid is rejected because the value provided is less than the registered minimum value. The validation message provides additional information comparing the minimum ramp rate and the value in the Bid.

Your Bid is rejected because the value provided is less than the registered minimum value. The validation message provides additional information comparing the minimum ramp rate and the value in the Bid.

Your Bid is rejected because the value provided is less than the registered minimum value. The validation message provides additional information comparing the minimum ramp rate and the value in the Bid.

Your Bid is rejected because the sum of Energy FCAS Bid Availabilities (1 to 10) is greater than the Registered Generation or Load Capacity of the DUID.  This validation is applied to all DUIDs, including BDUs and is associated with the LOAD or GEN Direction of the Bid.

Your Bid is rejected because the band prices must remain same for a rebid.