Idd part 1 Interfaces with bsc parties and their Agents




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4.3 BMRA-I006: (output) Publish Derived Data


Interface ID:

BMRA-I006



User:

BMR Service User



Title:

Publish Derived Data



BSC reference:

BMRA SD 9.1, CP560, P18A, P78, P217, CP1333



Mechanism

BMRA Publishing Interface



Frequency:

Once, for each settlement period.



Volumes:

Between 1000 - 5000 BM units. In each settlement period, at least 1 FPN data and 1 Bid-Offer Acceptance per BM unit. At most 12 Bid-Offer Pairs per BM unit (estimated 1000) that receives bids and offers.



Interface Requirement:

The BMRA Service shall normally publish Derived data once for each settlement period, as soon as it is calculated. Where as a result of an outage, calculations have been based on incomplete or incorrect data from the SO, derived data may be republished.


The Derived data shall include:
Derived BM Unit Data (for all Settlement Dates)

Period Bid and Offer Acceptance Volumes (QABknij, QAOknij and CADL Flag)

Estimated Period Balancing Mechanism Bid and Offer Cashflows (CBnij and CO nij)

Derived BM Unit Data (for Settlement Dates prior to the P217 effective date)

Estimated Period BM Unit Total Accepted Bid and Offer Volume (QABnij and QAOnij)

Derived BM Unit Data (for Settlement Dates after, and including the P217 effective date)

Estimated Period BM Unit Original Accepted Bid and Offer Volume (QABnij and QAOnij)

Estimated Period BM Unit Tagged Accepted Bid and Offer Volume (QTABnij and QTAOnij)

Estimated Period BM Unit Repriced Accepted Bid and Offer Volume (QRABnij and QRAOnij)

Estimated Period BM Unit Originally-Priced Accepted Bid and Offer Volume (QOABnij and QOAOnij)

Derived System-wide Data (for Settlement Dates prior to the P217 effective date)

Estimated System Sell/Buy Prices (SBPj and SSPj)

Price Derivation Code (PDCj)

Indicative Net Imbalance Volume (NIVj)

Total Accepted Bid Volume and Total Accepted Offer Volume

Total Unpriced Accepted Bid Volume and Total Unpriced Accepted Offer Volume

Total Priced Accepted Bid Volume and Total Priced Accepted Offer Volume

Total Bid Volume and Total Offer Volume

Derived System-wide Data (for Settlement Dates after, and including the P217 effective date)

Estimated System Sell/Buy Prices (SBPj and SSPj)

Price Derivation Code (PDCj)

Indicative Net Imbalance Volume (NIVj)

Replacement Price (RPj)

Replacement Price Calculation Volume (RPVj)

Total Accepted Bid Volume

Total Accepted Offer Volume

Tagged Accepted Bid Volume

Tagged Accepted Offer Volume

Total Adjustment Buy Volume

Total Adjustment Sell Volume

Tagged Adjustment Buy Volume

Tagged Adjustment Sell Volume


The BMRA Service shall publish details of the Indicative System Price Stacks once for each Settlement Period. This will detail all items on both the Buy and Sell Stacks including a description of the ordering of items within each stack. Each stack item will have the following data reported against it:
Indicative System Price Stack Item (see below for further details)

Index


Component Identifier

Acceptance Number

Bid-Offer Pair Number

CADL Flag (T/F)

SO-Flag (T/F)

Repriced Indicator (T/F)

Original Price (£/MWh)

Volume (MWh)

DMAT Adjusted Volume (MWh)

Arbitrage Adjusted Volume (MWh)

NIV Adjusted Volume (MWh)

PAR Adjusted Volume (MWh)

Final Price (£/MWh)

Transmission Loss Multiplier

TLM Adjusted Volume (MWh)

TLM Adjusted Cost (£)


Notes:
i. The Index will be a unique positive integer representing the item’s relative position in the stack. The first item in the stack has an index of 1. The reported ordering of items reflects the final order of the stack.
ii. The Component Identifier will hold the associated BM Unit’s Identifier for Acceptance Volume stack items, or the SO allocated ID for Disaggregated BSAD stack items.
iii. For Disaggregated BSAD stack items no Acceptance Number and Bid Offer Pair Number values will be reported.
iv. The Repriced Indicator will reflect whether or not the stack item has been repriced.
v. The Price value will be the final derived price for the stack item as used to derive the TLM Adjusted Cost (i.e. it will be the Replacement Price where appropriate).
vi. The various “Adjusted Volume” values will be that part of the original volume that remains untagged after applying the associated process – e.g. PAR Adjusted Volume will be that volume which remains untagged after having carried out PAR Tagging.
vii. The Transmission Loss Multiplier will be the Transmission Loss Multiplier for the stack item’s associated BM Unit. For Disaggregated BSAD stack items, which have no associated BM Unit, this will always be a value of 1.
viii. TLM Adjusted Volume = PAR Adjusted Volume x TLM
ix. TLM Adjusted Cost = PAR Adjusted Volume x TLM x Price
For a full derivation of the various data items, refer to the Indicative System Price Calculation in the BMRA URS.
Derived data will be published for each Settlement Period within + 15 (parameterised) minutes from the end of the Settlement Period.

Physical Interface Details:

Valid values for the Price Derivation Code are:


Code Description

A SBP = Main price; SSP = Reverse Price

B SSP Capped to SBP

C SSP Defaulted to SBP

D SBP & SSP Defaulted to Market Price

E SSP & SBP Defaulted to Zero

F SSP = Main Price; SBP = Reverse Price

G SBP Capped to SSP

H SBP Defaulted to SSP

I SBP & SSP Defaulted to Market Price

J SSP & SBP Defaulted to Zero

K SSP & SBP Defaulted to Market Price

L SSP & SBP Defaulted to Zero


4.3.1 Indicative System Price Stack Data


For a full definition of what the variables mean and their derivation, refer to the Indicative System Price Calculation in the BMRA URS.

Each stack (Buy or Sell) will consist of a number of stack items listed in descending price order. Each stack item’s data consists of the following:



Data Item

Description

Index

A unique positive integer representing the item’s relative position in the stack. The first item in the stack has an index of 1. The reported ordering of items reflects the final order of the stack.

Component Identifier

For Acceptance Volume stack items the Component Identifier will represent the associated BM Unit’s Identifier. For Balancing Services Adjustment Action stack items Component Identifier will represent the SO allocated ID.

Acceptance Number

Only reported for Acceptance Volume stack items (null for Balancing Services Adjustment Action stack items.)

Bid-Offer Pair Number

Only reported for Acceptance Volume stack items (null for Balancing Services Adjustment Action stack items.)

CADL Flag

A value of ‘T’ indicates where an Acceptance stack item is considered to be a Short Duration Acceptance.

SO-Flag

A value of ‘T’ indicates where the SO has flagged this stack item as potentially impacted by transmission constraints.

Repriced Indicator

A value of ‘T’ indicates where a stack item has been repriced.

Original Price

The original price of the stack item (£/MWh).

Volume

The initial volume of the stack item (MWh).

DMAT Adjusted Volume

The volume of the stack item which is not considered to be impacted by DMAT (MWh).

Arbitrage Adjusted Volume

The volume of the stack item which is not impacted by Arbitrage (MWh).

NIV Adjusted Volume

The volume of the stack item which is not NIV tagged (MWh).

PAR Adjusted Volume

The volume of the stack item which is not PAR tagged (MWh).

Final Price

The final price of the stack item (as used to determined the TLM Adjusted Cost) (£/MWh).

Transmission Loss Multiplier

The Transmission Loss Multiplier associated with the stack item. For Acceptance Volume stack items this will be determined from the related BM Unit.

For Balancing Services Adjustment Action stack items This will be considered to be 1.



TLM Adjusted Volume

PAR Adjusted Volume x TLM (MWh)

TLM Adjusted Cost

TLM Adjusted Volume x Price (£)


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