MARKETSUSPENSION

MARKETSUSPENSION is obsolete from 2017 End of Year DM4.27 Release. MARKETSUSPENSION sets out a start and end periods of any market suspension and the reason.

Deprecation Warning

This table is in the HISTORICAL TABLES package, so is likely deprecated.

MARKETSUSPENSION is public data, so is available to all participants.

Source

MARKETSUSPENSION updates only if market is suspended.

Column Schema

SUSPENSIONID

Unique identifier for suspension

SQL Type: VARCHAR2(10) Polars Type: str

This column is mandatory, and a primary key.

Examples:

SA BLACK
Y2KCAP

ENDAUTHORISEDBY

User authorising end

SQL Type: VARCHAR2(15) Polars Type: str

This column is not mandatory.

Examples:

CBROWNLEE
RGILLETT

ENDDATE

End Date of suspension

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

This column is not mandatory.

Example: 2000/01/03 00:00:00

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

ENDPERIOD

End trading interval of suspension

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

This column is not mandatory.

Examples: 0, 45

LASTCHANGED

Last date and time record changed

For more information, see the dedicated documentation page.

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

This column is not mandatory.

Example: 1999/12/30 19:10:46

REASON

Reason for suspension

SQL Type: VARCHAR2(64) Polars Type: str

This column is not mandatory.

Examples:

System Black & Ministerial Direction
Y2K Price Cap during 3 day Y2K Period 31/12/1999 to 02/01/2000

STARTAUTHORISEDBY

User authorising start

SQL Type: VARCHAR2(15) Polars Type: str

This column is not mandatory.

Examples:

CBROWNLEE
RGILLETT

STARTDATE

Start date of suspension

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

This column is not mandatory.

Example: 1999/12/31 00:00:00

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

STARTPERIOD

Start trading interval of suspension

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

This column is not mandatory.

Examples: 1, 33

New Data Timing

When the market is suspended

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"

# Dates are represented as datetimes at midnight

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

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("LASTCHANGED").str.strptime(pl.Datetime, dt_s_fmt),
        pl.col("ENDDATE", "STARTDATE").str.strptime(pl.Date, d_fmt),
    )
    .cast(
        {
            "SUSPENSIONID": str,
            "ENDAUTHORISEDBY": str,
            "ENDDATE": pl.Date(),
            "ENDPERIOD": int,  # or pl.Int16
            "REASON": str,
            "STARTAUTHORISEDBY": str,
            "STARTDATE": pl.Date(),
            "STARTPERIOD": int,  # or pl.Int16
        }
    )
    # Deduplicate
    # We want one row per ['SUSPENSIONID']
    # Tie-breaker: greatest value of ['LASTCHANGED']
    .sort(["LASTCHANGED"], descending=False)
    .unique(subset=["SUSPENSIONID"], keep="last")
)

Nemosis

This table is not yet available in Nemosis.

Example File

From PUBLIC_ARCHIVE_MARKETSUSPENSION_FILE01_202609010000.zip

Table without MetadataTable with MetadataRaw Text without Metadata

SUSPENSIONID	STARTDATE	STARTPERIOD	ENDDATE	ENDPERIOD	REASON	STARTAUTHORISEDBY	ENDAUTHORISEDBY	LASTCHANGED
Y2KCAP	1999/12/31 00:00:00	1	2000/01/03 00:00:00	0	Y2K Price Cap during 3 day Y2K Period 31/12/1999 to 02/01/2000	RGILLETT	RGILLETT	1999/12/30 19:10:46
SA BLACK	2016/09/28 00:00:00	33	2016/10/11 00:00:00	45	System Black & Ministerial Direction	CBROWNLEE	CBROWNLEE	2016/10/11 22:47:43

C

SETP.WORLD

DVD_MARKETSUSPENSION

AEMO

PUBLIC

2026/10/09

15:53:28

001791525208133

MONTHLY_ARCHIVE

001791525208133

I

FORCE_MAJEURE

MARKETSUSPENSION

1

SUSPENSIONID

STARTDATE

STARTPERIOD

ENDDATE

ENDPERIOD

REASON

STARTAUTHORISEDBY

ENDAUTHORISEDBY

LASTCHANGED

D

FORCE_MAJEURE

MARKETSUSPENSION

1

Y2KCAP

1999/12/31 00:00:00

1

2000/01/03 00:00:00

0

Y2K Price Cap during 3 day Y2K Period 31/12/1999 to 02/01/2000

RGILLETT

1999/12/30 19:10:46

D

FORCE_MAJEURE

MARKETSUSPENSION

1

SA BLACK

2016/09/28 00:00:00

33

2016/10/11 00:00:00

45

System Black & Ministerial Direction

CBROWNLEE

2016/10/11 22:47:43

C

END OF REPORT

5

SUSPENSIONID,STARTDATE,STARTPERIOD,ENDDATE,ENDPERIOD,REASON,STARTAUTHORISEDBY,ENDAUTHORISEDBY,LASTCHANGED
Y2KCAP,"1999/12/31 00:00:00",1,"2000/01/03 00:00:00",0,"Y2K Price Cap during 3 day Y2K Period 31/12/1999 to 02/01/2000",RGILLETT,RGILLETT,"1999/12/30 19:10:46"
"SA BLACK ","2016/09/28 00:00:00",33,"2016/10/11 00:00:00",45,"System Black & Ministerial Direction ",CBROWNLEE,CBROWNLEE,"2016/10/11 22:47:43"

Raw Text with Metadata

C,SETP.WORLD,DVD_MARKETSUSPENSION,AEMO,PUBLIC,2026/10/09,15:53:28,001791525208133,MONTHLY_ARCHIVE,001791525208133
I,FORCE_MAJEURE,MARKETSUSPENSION,1,SUSPENSIONID,STARTDATE,STARTPERIOD,ENDDATE,ENDPERIOD,REASON,STARTAUTHORISEDBY,ENDAUTHORISEDBY,LASTCHANGED
D,FORCE_MAJEURE,MARKETSUSPENSION,1,Y2KCAP,"1999/12/31 00:00:00",1,"2000/01/03 00:00:00",0,"Y2K Price Cap during 3 day Y2K Period 31/12/1999 to 02/01/2000",RGILLETT,RGILLETT,"1999/12/30 19:10:46"
D,FORCE_MAJEURE,MARKETSUSPENSION,1,"SA BLACK ","2016/09/28 00:00:00",33,"2016/10/11 00:00:00",45,"System Black & Ministerial Direction ",CBROWNLEE,CBROWNLEE,"2016/10/11 22:47:43"
C,"END OF REPORT",5

Availability

Visibility: Public

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 1 of 2015. The most recent available data is month 9 of 2026.

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

Data Size

Each year of data is approximately 7 KB when zipped, 72 KB as unzipped CSV.

Deduplication and PDR Loader Configuration

The primary keys are:

SUSPENSIONID

PDR Loader configuration is:

Report Name	Report Subtype	Version	Undisclosed
FORCE_MAJEURE	MARKETSUSPENSION	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,FORCE_MAJEURE,MARKETSUSPENSION,1,...
D,FORCE_MAJEURE,MARKETSUSPENSION,1,...

Indexes

LASTCHANGED

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: HISTORICAL TABLES