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MNSP_BIDOFFERPERIOD

MNSP_BIDOFFERPERIOD shows availability for 5-minute periods for a specific Bid and LinkID for the given Trading Date and period. MNSP_BIDOFFERPERIOD is a child to MNSP_DAYOFFER and links to BIDOFFERFILETRK for 5MS Bids.

Column Schema

LINKID

Identifier for each of the two MNSP Interconnector Links. Each link pertains to the direction from and to.

SQL Type: VARCHAR2(20) Polars Type: str

This column is mandatory, and a primary key.

Examples:

  • BLNKTAS
  • BLNKVIC

OFFERDATETIME

Time this bid was processed and loaded

SQL Type: TIMESTAMP(3) Polars Type: pl.Datetime()

This column is mandatory, and a primary key.

Example: 2026/05/05 15:16:58.000

Unlike most datetime columns, this one includes a millisecond component. e.g. 2029/03/15 00:00:00.123.

PERIODID

Period ID, 1 to 288

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

This column is mandatory, and a primary key.

Examples: 1, 288

TRADINGDATE

The trading date this bid is for

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

This column is mandatory, and a primary key.

Example: 2026/07/02 00:00:00

Note that AEMO represents dates as datetimes with a midnight time component.

BANDAVAIL1

Availability at price band 1

SQL Type: NUMBER(8,3) Polars Type: pl.Float64

This column is not mandatory.

Example: 0

BANDAVAIL2

Availability at price band 2

SQL Type: NUMBER(8,3) Polars Type: pl.Float64

This column is not mandatory.

Examples: 0, 100

BANDAVAIL3

Availability at price band 3

SQL Type: NUMBER(8,3) Polars Type: pl.Float64

This column is not mandatory.

Example: 100

BANDAVAIL4

Availability at price band 4

SQL Type: NUMBER(8,3) Polars Type: pl.Float64

This column is not mandatory.

Example: 100

BANDAVAIL5

Availability at price band 5

SQL Type: NUMBER(8,3) Polars Type: pl.Float64

This column is not mandatory.

Example: 100

BANDAVAIL6

Availability at price band 6

SQL Type: NUMBER(8,3) Polars Type: pl.Float64

This column is not mandatory.

Example: 100

BANDAVAIL7

Availability at price band 7

SQL Type: NUMBER(8,3) Polars Type: pl.Float64

This column is not mandatory.

Examples: 78, 94

BANDAVAIL8

Availability at price band 8

SQL Type: NUMBER(8,3) Polars Type: pl.Float64

This column is not mandatory.

Example: 0

BANDAVAIL9

Availability at price band 9

SQL Type: NUMBER(8,3) Polars Type: pl.Float64

This column is not mandatory.

Example: 0

BANDAVAIL10

Availability at price band 10

SQL Type: NUMBER(8,3) Polars Type: pl.Float64

This column is not mandatory.

Example: 0

FIXEDLOAD

Fixed unit output, in MW. A value of NULL means no fixed load so the unit is dispatched according to bid and the market.

SQL Type: NUMBER(8,3) Polars Type: pl.Float64

This column is not mandatory.

MAXAVAIL

Maximum planned availability MW

SQL Type: NUMBER(8,3) Polars Type: pl.Float64

This column is not mandatory.

Example: 0

PASAAVAILABILITY

Allows for future use for Energy bids, being the physical plant capability including any capability potentially available within 24 hours

SQL Type: NUMBER(8,3) Polars Type: pl.Float64

This column is not mandatory.

Example: 438

RAMPUPRATE

Ramp rate (MW / min) in the positive direction of flow for this MNSP link for this half-hour period

SQL Type: NUMBER(6) Polars Type: pl.Int32

This column is not mandatory.

Example: 200

RECALL_PERIOD

The advance notice(in hours) that a Scheduled Resource requires to achieve the PASA Availability MW for this trading interval

SQL Type: NUMBER(8,3) Polars Type: pl.Float64

This column is not mandatory.

Example: 0

New Data Timing

Generated as submissions are processed in next-day reports

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

# Dates are represented as datetimes at midnight

# e.g. "2029/03/15 00:00:00"

d_fmt = "%Y/%m/%d 00:00:00"

# for "TIMESTAMP" columns
# Note that Polars uses slightly different format strings for fractional seconds to `dt.strptime`
# e.g. "2029/03/15 00:00:00.123".
dt_ms_fmt = "%Y/%m/%d %H:%M:%S%.3f"

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("TRADINGDATE").str.strptime(pl.Date, d_fmt),
        pl.col("OFFERDATETIME").str.strptime(pl.Datetime, dt_ms_fmt),
    )
    .cast(
        {
            "LINKID": str,
            "PERIODID": int,  # or pl.Int16
            "TRADINGDATE": pl.Date(),
            "BANDAVAIL1": pl.Float64,
            "BANDAVAIL2": pl.Float64,
            "BANDAVAIL3": pl.Float64,
            "BANDAVAIL4": pl.Float64,
            "BANDAVAIL5": pl.Float64,
            "BANDAVAIL6": pl.Float64,
            "BANDAVAIL7": pl.Float64,
            "BANDAVAIL8": pl.Float64,
            "BANDAVAIL9": pl.Float64,
            "BANDAVAIL10": pl.Float64,
            "FIXEDLOAD": pl.Float64,
            "MAXAVAIL": pl.Float64,
            "PASAAVAILABILITY": pl.Float64,
            "RAMPUPRATE": int,  # or pl.Int32
            "RECALL_PERIOD": pl.Float64,
        }
    )
    # Deduplicate
    # We want one row per ['LINKID', 'OFFERDATETIME', 'PERIODID', 'TRADINGDATE']
    .unique(subset=["LINKID", "OFFERDATETIME", "PERIODID", "TRADINGDATE"], keep="any")
)

Nemosis

This table is not yet available in Nemosis.

Example File

From PUBLIC_ARCHIVE_MNSP_BIDOFFERPERIOD_FILE01_202607010000.zip

LINKIDTRADINGDATEOFFERDATETIMEPERIODIDMAXAVAILFIXEDLOADRAMPUPRATEBANDAVAIL1BANDAVAIL2BANDAVAIL3BANDAVAIL4BANDAVAIL5BANDAVAIL6BANDAVAIL7BANDAVAIL8BANDAVAIL9BANDAVAIL10PASAAVAILABILITYRECALL_PERIOD
BLNKTAS2026/07/02 00:00:002026/05/05 15:17:09.000102000100100100100100940004380
BLNKTAS2026/07/02 00:00:002026/05/05 15:17:09.000202000100100100100100940004380
BLNKTAS2026/07/02 00:00:002026/05/05 15:17:09.000302000100100100100100940004380
BLNKTAS2026/07/02 00:00:002026/05/05 15:17:09.000402000100100100100100940004380
BLNKTAS2026/07/02 00:00:002026/05/05 15:17:09.000502000100100100100100940004380
BLNKTAS2026/07/02 00:00:002026/05/05 15:17:09.000602000100100100100100940004380
BLNKTAS2026/07/02 00:00:002026/05/05 15:17:09.000702000100100100100100940004380
BLNKTAS2026/07/02 00:00:002026/05/05 15:17:09.000802000100100100100100940004380
BLNKTAS2026/07/02 00:00:002026/05/05 15:17:09.000902000100100100100100940004380
BLNKTAS2026/07/02 00:00:002026/05/05 15:17:09.0001002000100100100100100940004380
BLNKTAS2026/07/02 00:00:002026/05/05 15:17:09.0001102000100100100100100940004380
...

CSETP.WORLDDVD_MNSP_BIDOFFERPERIODAEMOPUBLIC2026/08/0812:31:31001786156291071MONTHLY_ARCHIVE001786156291071
IBIDSMNSP_BIDOFFERPERIOD2LINKIDTRADINGDATEOFFERDATETIMEPERIODIDMAXAVAILFIXEDLOADRAMPUPRATEBANDAVAIL1BANDAVAIL2BANDAVAIL3BANDAVAIL4BANDAVAIL5BANDAVAIL6BANDAVAIL7BANDAVAIL8BANDAVAIL9BANDAVAIL10PASAAVAILABILITYRECALL_PERIOD
DBIDSMNSP_BIDOFFERPERIOD2BLNKTAS2026/07/02 00:00:002026/05/05 15:17:09.000102000100100100100100940004380
DBIDSMNSP_BIDOFFERPERIOD2BLNKTAS2026/07/02 00:00:002026/05/05 15:17:09.000202000100100100100100940004380
DBIDSMNSP_BIDOFFERPERIOD2BLNKTAS2026/07/02 00:00:002026/05/05 15:17:09.000302000100100100100100940004380
DBIDSMNSP_BIDOFFERPERIOD2BLNKTAS2026/07/02 00:00:002026/05/05 15:17:09.000402000100100100100100940004380
DBIDSMNSP_BIDOFFERPERIOD2BLNKTAS2026/07/02 00:00:002026/05/05 15:17:09.000502000100100100100100940004380
DBIDSMNSP_BIDOFFERPERIOD2BLNKTAS2026/07/02 00:00:002026/05/05 15:17:09.000602000100100100100100940004380
DBIDSMNSP_BIDOFFERPERIOD2BLNKTAS2026/07/02 00:00:002026/05/05 15:17:09.000702000100100100100100940004380
DBIDSMNSP_BIDOFFERPERIOD2BLNKTAS2026/07/02 00:00:002026/05/05 15:17:09.000802000100100100100100940004380
DBIDSMNSP_BIDOFFERPERIOD2BLNKTAS2026/07/02 00:00:002026/05/05 15:17:09.000902000100100100100100940004380
DBIDSMNSP_BIDOFFERPERIOD2BLNKTAS2026/07/02 00:00:002026/05/05 15:17:09.0001002000100100100100100940004380
DBIDSMNSP_BIDOFFERPERIOD2BLNKTAS2026/07/02 00:00:002026/05/05 15:17:09.0001102000100100100100100940004380
...
CEND OF REPORT1003

LINKID,TRADINGDATE,OFFERDATETIME,PERIODID,MAXAVAIL,FIXEDLOAD,RAMPUPRATE,BANDAVAIL1,BANDAVAIL2,BANDAVAIL3,BANDAVAIL4,BANDAVAIL5,BANDAVAIL6,BANDAVAIL7,BANDAVAIL8,BANDAVAIL9,BANDAVAIL10,PASAAVAILABILITY,RECALL_PERIOD
BLNKTAS,"2026/07/02 00:00:00","2026/05/05 15:17:09.000",1,0,,200,0,100,100,100,100,100,94,0,0,0,438,0
BLNKTAS,"2026/07/02 00:00:00","2026/05/05 15:17:09.000",2,0,,200,0,100,100,100,100,100,94,0,0,0,438,0
BLNKTAS,"2026/07/02 00:00:00","2026/05/05 15:17:09.000",3,0,,200,0,100,100,100,100,100,94,0,0,0,438,0
BLNKTAS,"2026/07/02 00:00:00","2026/05/05 15:17:09.000",4,0,,200,0,100,100,100,100,100,94,0,0,0,438,0
BLNKTAS,"2026/07/02 00:00:00","2026/05/05 15:17:09.000",5,0,,200,0,100,100,100,100,100,94,0,0,0,438,0
BLNKTAS,"2026/07/02 00:00:00","2026/05/05 15:17:09.000",6,0,,200,0,100,100,100,100,100,94,0,0,0,438,0
BLNKTAS,"2026/07/02 00:00:00","2026/05/05 15:17:09.000",7,0,,200,0,100,100,100,100,100,94,0,0,0,438,0
BLNKTAS,"2026/07/02 00:00:00","2026/05/05 15:17:09.000",8,0,,200,0,100,100,100,100,100,94,0,0,0,438,0
BLNKTAS,"2026/07/02 00:00:00","2026/05/05 15:17:09.000",9,0,,200,0,100,100,100,100,100,94,0,0,0,438,0
BLNKTAS,"2026/07/02 00:00:00","2026/05/05 15:17:09.000",10,0,,200,0,100,100,100,100,100,94,0,0,0,438,0
BLNKTAS,"2026/07/02 00:00:00","2026/05/05 15:17:09.000",11,0,,200,0,100,100,100,100,100,94,0,0,0,438,0
...

C,SETP.WORLD,DVD_MNSP_BIDOFFERPERIOD,AEMO,PUBLIC,2026/08/08,12:31:31,001786156291071,MONTHLY_ARCHIVE,001786156291071
I,BIDS,MNSP_BIDOFFERPERIOD,2,LINKID,TRADINGDATE,OFFERDATETIME,PERIODID,MAXAVAIL,FIXEDLOAD,RAMPUPRATE,BANDAVAIL1,BANDAVAIL2,BANDAVAIL3,BANDAVAIL4,BANDAVAIL5,BANDAVAIL6,BANDAVAIL7,BANDAVAIL8,BANDAVAIL9,BANDAVAIL10,PASAAVAILABILITY,RECALL_PERIOD
D,BIDS,MNSP_BIDOFFERPERIOD,2,BLNKTAS,"2026/07/02 00:00:00","2026/05/05 15:17:09.000",1,0,,200,0,100,100,100,100,100,94,0,0,0,438,0
D,BIDS,MNSP_BIDOFFERPERIOD,2,BLNKTAS,"2026/07/02 00:00:00","2026/05/05 15:17:09.000",2,0,,200,0,100,100,100,100,100,94,0,0,0,438,0
D,BIDS,MNSP_BIDOFFERPERIOD,2,BLNKTAS,"2026/07/02 00:00:00","2026/05/05 15:17:09.000",3,0,,200,0,100,100,100,100,100,94,0,0,0,438,0
D,BIDS,MNSP_BIDOFFERPERIOD,2,BLNKTAS,"2026/07/02 00:00:00","2026/05/05 15:17:09.000",4,0,,200,0,100,100,100,100,100,94,0,0,0,438,0
D,BIDS,MNSP_BIDOFFERPERIOD,2,BLNKTAS,"2026/07/02 00:00:00","2026/05/05 15:17:09.000",5,0,,200,0,100,100,100,100,100,94,0,0,0,438,0
D,BIDS,MNSP_BIDOFFERPERIOD,2,BLNKTAS,"2026/07/02 00:00:00","2026/05/05 15:17:09.000",6,0,,200,0,100,100,100,100,100,94,0,0,0,438,0
D,BIDS,MNSP_BIDOFFERPERIOD,2,BLNKTAS,"2026/07/02 00:00:00","2026/05/05 15:17:09.000",7,0,,200,0,100,100,100,100,100,94,0,0,0,438,0
D,BIDS,MNSP_BIDOFFERPERIOD,2,BLNKTAS,"2026/07/02 00:00:00","2026/05/05 15:17:09.000",8,0,,200,0,100,100,100,100,100,94,0,0,0,438,0
D,BIDS,MNSP_BIDOFFERPERIOD,2,BLNKTAS,"2026/07/02 00:00:00","2026/05/05 15:17:09.000",9,0,,200,0,100,100,100,100,100,94,0,0,0,438,0
D,BIDS,MNSP_BIDOFFERPERIOD,2,BLNKTAS,"2026/07/02 00:00:00","2026/05/05 15:17:09.000",10,0,,200,0,100,100,100,100,100,94,0,0,0,438,0
D,BIDS,MNSP_BIDOFFERPERIOD,2,BLNKTAS,"2026/07/02 00:00:00","2026/05/05 15:17:09.000",11,0,,200,0,100,100,100,100,100,94,0,0,0,438,0
...
C,"END OF REPORT",1003

Availability

Visibility: Private & Public Next-Day

This table is in the public monthly MMSDM archive.

I have collated the list of all those files into one place, in this CSV metadata file. (Columns year, month, url, compressed_size in bytes).

The earliest available data is month 3 of 2021. The most recent available data is month 7 of 2026.

Every month in between has a file. (No gaps.)

Warning

The filenames of zips may not correspond to the tables. These can be mixed up with MNSP_PEROFFER. Check column 2 and 3 inside the CSV against REPORT_NAME and REPORT_SUBTYPE to be sure. I have already done this for you, and listed all URLs in this metadata file.

Data Size

Each year of data is approximately 169 KB when zipped, 2 MB as unzipped CSV.

Deduplication and PDR Loader Configuration

The primary keys are:

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 Undisclosed
BIDS MNSP_BIDOFFERPERIOD 1
BIDS MNSP_BIDOFFERPERIOD 2
OFFER MNSP_BIDOFFERPERIOD 1 ⚠️

Warning

Some of these file mappings are not in the published PDR Loader configuration file, even though files for this table exist with those metadata values. Mappings marked with ⚠️ have been added by me after manually inspecting those files.

This means that the CSV files start with metadata columns:

I,BIDS,MNSP_BIDOFFERPERIOD,1,...
D,BIDS,MNSP_BIDOFFERPERIOD,1,...

or

I,BIDS,MNSP_BIDOFFERPERIOD,2,...
D,BIDS,MNSP_BIDOFFERPERIOD,2,...

or

I,OFFER,MNSP_BIDOFFERPERIOD,1,...
D,OFFER,MNSP_BIDOFFERPERIOD,1,...

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: BIDS