SET_IRSR_LOOP_NSP_ALLOCATION

This report contains Inter-Regional Negative Residue Amounts to allocate to TNSPs.

Column Schema

INTERCONNECTORLOOPID

The Interconnector Loop Identifier

SQL Type: VARCHAR2(20) Polars Type: str

This column is mandatory, and a primary key.

PARTICIPANTID

The TNSP Participant Identifier

For more information, see the dedicated documentation page.

SQL Type: VARCHAR2(20) Polars Type: pl.Categorical

This column is mandatory, and a primary key.

PERIODID

The Settlement Period Id(1-288)

SQL Type: NUMBER(3,0) Polars Type: pl.Int16

This column is mandatory, and a primary key.

REGIONID

The Region Identifier

For more information, see the dedicated documentation page.

The SQL type is VARCHAR2(20). This is actually a factor/enum, with values:

• QLD1

• VIC1

• TAS1

• NSW1

• SA1

• SNOWY1

This column is mandatory, and a primary key.

SETTLEMENTDATE

The Settlement Date of the Billing Week

Warning

Despite what the name suggests, this is a datetime, not a date.

SQL Type: DATE Polars Type: pl.Datetime()

This column is mandatory, and a primary key.

Example: 2026/01/20 00:05:00

VERSIONNO

The Settlement Run No

SQL Type: NUMBER(3,0) Polars Type: pl.UInt16

This column is mandatory, and a primary key.

ALLOCATION

Participant Portion %(e.g. 100)

SQL Type: NUMBER(18,8) Polars Type: pl.Float64

This column is not mandatory.

AVGREGION_MWH

Annual Regional Demand for the Region

SQL Type: NUMBER(18,8) Polars Type: pl.Float64

This column is not mandatory.

LASTCHANGED

The last changed date time of the record.

For more information, see the dedicated documentation page.

SQL Type: DATE Polars Type: pl.Datetime()

This column is not mandatory.

Example: 2026/01/20 00:05:00

NLA

Net Loop Allocation(negative only)

SQL Type: NUMBER(18,8) Polars Type: pl.Float64

This column is not mandatory.

RESIDUE_AMOUNT

Calculated Negative Residue Amount based on regional share

SQL Type: NUMBER(18,8) Polars Type: pl.Float64

This column is not mandatory.

TOTALREGION_MWH

Total Annual Regional Demand for all Regions in the Loop

SQL Type: NUMBER(18,8) Polars Type: pl.Float64

This column is not mandatory.

New Data Timing

Daily Billing Run & Posting a PRELIM/FINAL and REVISE Billing Run

Code Examples

Polars

Casting is enums, categoricals etc is not essential, but may speed up parsing. Swapping int for pl.UInt16, pl.Int32 would also speed up parsing. However some of the datatypes are inferred, so they may be wrong.

This code deduplicates for you. Deduplication is normally only required across multiple months.

This code assumes that all columns are present, which may not be true for older files.

import polars as pl
import polars.selectors as cs

# e.g. "2029/03/15 00:05:00"
dt_s_fmt = "%Y/%m/%d %H:%M:%S"

csv_paths = ["SOMEFILE.CSV", "OTHERFILE.CSV"]

lf = (
    pl.concat(
        [
            pl.scan_csv(
                csv_path,  # must be unzipped beforehand
                skip_rows=1,  # skip the header
                infer_schema=False,  # much faster
            )
            .filter(cs.by_index(0) == "D")  # drop the footer
            .select(~cs.by_index(range(4)))  # drop metadata columns
            for csv_path in csv_paths
        ],
        how="diagonal_relaxed",
    )
    .with_columns(
        pl.col("SETTLEMENTDATE", "LASTCHANGED").str.strptime(pl.Datetime, dt_s_fmt),
    )
    .cast(
        {
            "INTERCONNECTORLOOPID": str,
            "PARTICIPANTID": pl.Categorical,
            "PERIODID": int,  # or pl.Int16
            "REGIONID": pl.Enum(["QLD1", "VIC1", "TAS1", "NSW1", "SA1", "SNOWY1"]),
            "VERSIONNO": int,  # or pl.UInt16
            "ALLOCATION": pl.Float64,
            "AVGREGION_MWH": pl.Float64,
            "NLA": pl.Float64,
            "RESIDUE_AMOUNT": pl.Float64,
            "TOTALREGION_MWH": pl.Float64,
        }
    )
    # Deduplicate
    # We want one row per ['INTERCONNECTORLOOPID', 'PARTICIPANTID', 'PERIODID', 'REGIONID', 'SETTLEMENTDATE', 'VERSIONNO']
    # Tie-breaker: greatest value of LASTCHANGED
    .sort(LASTCHANGED, descending=False)
    .unique(
        subset=[
            "INTERCONNECTORLOOPID",
            "PARTICIPANTID",
            "PERIODID",
            "REGIONID",
            "SETTLEMENTDATE",
            "VERSIONNO",
        ],
        keep="last",
    )
)

Nemosis

This table is not yet available in Nemosis.

Availability

Visibility: Private

This table is not available in the public monthly MMSDM archive. Is is only available to registered market participants over FTP inside a VPN.

Deduplication and PDR Loader Configuration

The primary keys are:

• INTERCONNECTORLOOPID

• PARTICIPANTID

• PERIODID

• REGIONID

• SETTLEMENTDATE

• VERSIONNO

The transaction type is "insert", which means that you will usually not see duplicate data. If you do, you can deduplicate based on the primary keys, without sorting first. Rows from different files with the same primary keys should have the same values.

PDR Loader configuration is:

Report Name	Report Subtype	Version
SETTLEMENTS	IRSR_LOOP_NSP_ALLOCATION	1

This means that the CSV files start with metadata columns:

I,SETTLEMENTS,IRSR_LOOP_NSP_ALLOCATION,1,...
D,SETTLEMENTS,IRSR_LOOP_NSP_ALLOCATION,1,...

Links

This page as JSON (schema documented here, but may change)

Download a JSON Schema specification for this table.

Official AEMO schema documentation

Other Information

Package: SETTLEMENT_DATA

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