CONTRACTGOVERNOR

CONTRACTGOVERNOR became unused when Ancillary Services Review was implemented in 2001. For more details, see Change Notice 126. CONTRACTGOVERNOR shows Governor contract details used in the settlement and dispatch of this service. Note services are dispatched as 6 and 60 raise and lower Frequency Control Ancillary Services (FCAS). Lower and raise 6 and 60 second fields are used in dispatch of services. Deadband and Droop details are used in settlements.

Deprecation Warning

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

Confidential to participant

Source

Not in Use - discontinued 30/09/2001: was updated only where there was a contract variation.

Tip

1 second, 6 second, 5 minute, 60 second and regulation refer to types of FCAS markets.

Column Schema

CONTRACTID

Contract Identifier

SQL Type: VARCHAR2(10) Polars Type: pl.Categorical

This column is mandatory, and a primary key.

VERSIONNO

Contract Version No.

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

This column is mandatory, and a primary key.

AUTHORISEDBY

User Name

SQL Type: VARCHAR2(15) Polars Type: str

This column is not mandatory.

AUTHORISEDDATE

Date Contract was authorised

Warning

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

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

This column is not mandatory.

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

CCPRICE

Compensation Cap

SQL Type: NUMBER(10,2) Polars Type: pl.Float64

This column is not mandatory.

DEADBANDDOWN

Lower Deadband

SQL Type: NUMBER(4,2) Polars Type: pl.Float64

This column is not mandatory.

DEADBANDUP

Raise Deadband

SQL Type: NUMBER(4,2) Polars Type: pl.Float64

This column is not mandatory.

DROOP6SECLOWERBREAKPOINT

Droop Equation Lower 6 Second Breakpoint

SQL Type: NUMBER(9,6) Polars Type: pl.Float64

This column is not mandatory.

DROOP6SECLOWERMAX

Droop Equation Lower 6 Second Maximum

SQL Type: NUMBER(9,6) Polars Type: pl.Float64

This column is not mandatory.

DROOP6SECRAISEBREAKPOINT

Droop Equation Raise 6 Second Breakpoint

SQL Type: NUMBER(9,6) Polars Type: pl.Float64

This column is not mandatory.

DROOP6SECRAISECAPACITY

Droop Equation Raise 6 Second Capacity

SQL Type: NUMBER(9,6) Polars Type: pl.Float64

This column is not mandatory.

DROOP6SECRAISEMAX

Droop Equation Raise 6 Second Maximum

SQL Type: NUMBER(9,6) Polars Type: pl.Float64

This column is not mandatory.

DROOP60SECLOWERBREAKPOINT

Droop Equation Lower 60 Second Breakpoint

SQL Type: NUMBER(9,6) Polars Type: pl.Float64

This column is not mandatory.

DROOP60SECLOWERMAX

Droop Equation Lower 60 Second Maximum

SQL Type: NUMBER(9,6) Polars Type: pl.Float64

This column is not mandatory.

DROOP60SECRAISEBREAKPOINT

Droop Equation Raise 60 Second Breakpoint

SQL Type: NUMBER(9,6) Polars Type: pl.Float64

This column is not mandatory.

DROOP60SECRAISECAPACITY

Droop Equation Raise 60 Second Capacity

SQL Type: NUMBER(9,6) Polars Type: pl.Float64

This column is not mandatory.

DROOP60SECRAISEMAX

Droop Equation Raise 60 Second Maximum

SQL Type: NUMBER(9,6) Polars Type: pl.Float64

This column is not mandatory.

DUID

Dispatchable Unit ID

Warning

This column may contain funny characters such as / (slash) or # (hash). This may break hive-style partitioning.

For more information, see the dedicated documentation page.

SQL Type: VARCHAR2(10) Polars Type: pl.Categorical

This column is not mandatory.

Example: W/HOE#2

ENDDATE

Termination Date of Contract

Warning

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

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

This column is not mandatory.

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

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: 2026/01/20 00:05:00

LOWER6SECBREAKPOINT

Limit Equation Lower 6 Second Breakpoint MW

SQL Type: NUMBER(9,6) Polars Type: pl.Float64

This column is not mandatory.

LOWER6SECMAX

Limit Equation Lower 6 Second Maximum MW

SQL Type: NUMBER(9,6) Polars Type: pl.Float64

This column is not mandatory.

LOWER60SECBREAKPOINT

Limit Equation Lower 60 Second Breakpoint MW

SQL Type: NUMBER(9,6) Polars Type: pl.Float64

This column is not mandatory.

LOWER60SECMAX

Limit Equation Lower 60 Second Maximum MW

SQL Type: NUMBER(9,6) Polars Type: pl.Float64

This column is not mandatory.

PARTICIPANTID

Unique participant identifier

For more information, see the dedicated documentation page.

SQL Type: VARCHAR2(10) Polars Type: pl.Categorical

This column is not mandatory.

PRICE6SECLOWERCONTRACT

Contract Price for 6 Second Lower

SQL Type: NUMBER(16,6) Polars Type: pl.Float64

This column is not mandatory.

PRICE6SECRAISECONTRACT

Contract Price for 6 Second Raise

SQL Type: NUMBER(16,6) Polars Type: pl.Float64

This column is not mandatory.

PRICE60SECLOWERCONTRACT

Contract Price for 60 Second Lower

SQL Type: NUMBER(16,6) Polars Type: pl.Float64

This column is not mandatory.

PRICE60SECRAISECONTRACT

Contract Price for 60 Second Raise

SQL Type: NUMBER(16,6) Polars Type: pl.Float64

This column is not mandatory.

QUANT6SECLOWERCONTRACT

Contract Quantity for 6 Second Lower

SQL Type: NUMBER(16,6) Polars Type: pl.Float64

This column is not mandatory.

QUANT6SECRAISECONTRACT

Contract Quantity for 6 Second Raise

SQL Type: NUMBER(16,6) Polars Type: pl.Float64

This column is not mandatory.

QUANT60SECLOWERCONTRACT

Contract Quantity for 60 Second Lower

SQL Type: NUMBER(16,6) Polars Type: pl.Float64

This column is not mandatory.

QUANT60SECRAISECONTRACT

Contract Quantity for 60 Second Raise

SQL Type: NUMBER(16,6) Polars Type: pl.Float64

This column is not mandatory.

RAISE6SECBREAKPOINT

Limit Equation Raise 6 Second Breakpoint MW

SQL Type: NUMBER(9,6) Polars Type: pl.Float64

This column is not mandatory.

RAISE6SECCAPACITY

Limit Equation Raise 6 Second Capacity MW

SQL Type: NUMBER(9,6) Polars Type: pl.Float64

This column is not mandatory.

RAISE6SECMAX

Limit Equation Raise 6 Second Maximum MW

SQL Type: NUMBER(9,6) Polars Type: pl.Float64

This column is not mandatory.

RAISE60SECBREAKPOINT

Limit Equation Raise 60 Second Breakpoint MW

SQL Type: NUMBER(9,6) Polars Type: pl.Float64

This column is not mandatory.

RAISE60SECCAPACITY

Limit Equation Raise 60 Second Capacity MW

SQL Type: NUMBER(9,6) Polars Type: pl.Float64

This column is not mandatory.

RAISE60SECMAX

Limit Equation Raise 60 Second Maximum MW

SQL Type: NUMBER(9,6) Polars Type: pl.Float64

This column is not mandatory.

STARTDATE

Starting Date of Contract

Warning

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

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

This column is not mandatory.

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

PRICE6SECLOWERMANDATORY

Not used

SQL Type: NUMBER(16,6) Polars Type: pl.Float64

This column is unused.

PRICE6SECRAISEMANDATORY

Not used

SQL Type: NUMBER(16,6) Polars Type: pl.Float64

This column is unused.

PRICE60SECLOWERMANDATORY

Not used

SQL Type: NUMBER(16,6) Polars Type: pl.Float64

This column is unused.

PRICE60SECRAISEMANDATORY

Not used

SQL Type: NUMBER(16,6) Polars Type: pl.Float64

This column is unused.

QUANT6SECLOWERMANDATORY

Not used

SQL Type: NUMBER(16,6) Polars Type: pl.Float64

This column is unused.

QUANT6SECRAISEMANDATORY

Not used

SQL Type: NUMBER(16,6) Polars Type: pl.Float64

This column is unused.

QUANT60SECLOWERMANDATORY

Not used

SQL Type: NUMBER(16,6) Polars Type: pl.Float64

This column is unused.

QUANT60SECRAISEMANDATORY

Not used

SQL Type: NUMBER(16,6) Polars Type: pl.Float64

This column is unused.

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("AUTHORISEDDATE", "ENDDATE", "LASTCHANGED", "STARTDATE").str.strptime(
            pl.Datetime, dt_s_fmt
        ),
    )
    .cast(
        {
            "CONTRACTID": pl.Categorical,
            "VERSIONNO": int,  # or pl.UInt16
            "AUTHORISEDBY": str,
            "CCPRICE": pl.Float64,
            "DEADBANDDOWN": pl.Float64,
            "DEADBANDUP": pl.Float64,
            "DROOP6SECLOWERBREAKPOINT": pl.Float64,
            "DROOP6SECLOWERMAX": pl.Float64,
            "DROOP6SECRAISEBREAKPOINT": pl.Float64,
            "DROOP6SECRAISECAPACITY": pl.Float64,
            "DROOP6SECRAISEMAX": pl.Float64,
            "DROOP60SECLOWERBREAKPOINT": pl.Float64,
            "DROOP60SECLOWERMAX": pl.Float64,
            "DROOP60SECRAISEBREAKPOINT": pl.Float64,
            "DROOP60SECRAISECAPACITY": pl.Float64,
            "DROOP60SECRAISEMAX": pl.Float64,
            "DUID": pl.Categorical,
            "LOWER6SECBREAKPOINT": pl.Float64,
            "LOWER6SECMAX": pl.Float64,
            "LOWER60SECBREAKPOINT": pl.Float64,
            "LOWER60SECMAX": pl.Float64,
            "PARTICIPANTID": pl.Categorical,
            "PRICE6SECLOWERCONTRACT": pl.Float64,
            "PRICE6SECRAISECONTRACT": pl.Float64,
            "PRICE60SECLOWERCONTRACT": pl.Float64,
            "PRICE60SECRAISECONTRACT": pl.Float64,
            "QUANT6SECLOWERCONTRACT": pl.Float64,
            "QUANT6SECRAISECONTRACT": pl.Float64,
            "QUANT60SECLOWERCONTRACT": pl.Float64,
            "QUANT60SECRAISECONTRACT": pl.Float64,
            "RAISE6SECBREAKPOINT": pl.Float64,
            "RAISE6SECCAPACITY": pl.Float64,
            "RAISE6SECMAX": pl.Float64,
            "RAISE60SECBREAKPOINT": pl.Float64,
            "RAISE60SECCAPACITY": pl.Float64,
            "RAISE60SECMAX": pl.Float64,
            "PRICE6SECLOWERMANDATORY": pl.Float64,
            "PRICE6SECRAISEMANDATORY": pl.Float64,
            "PRICE60SECLOWERMANDATORY": pl.Float64,
            "PRICE60SECRAISEMANDATORY": pl.Float64,
            "QUANT6SECLOWERMANDATORY": pl.Float64,
            "QUANT6SECRAISEMANDATORY": pl.Float64,
            "QUANT60SECLOWERMANDATORY": pl.Float64,
            "QUANT60SECRAISEMANDATORY": pl.Float64,
        }
    )
    # Drop deprecated/unused columns
    .drop(
        "PRICE6SECLOWERMANDATORY",
        "PRICE6SECRAISEMANDATORY",
        "PRICE60SECLOWERMANDATORY",
        "PRICE60SECRAISEMANDATORY",
        "QUANT6SECLOWERMANDATORY",
        "QUANT6SECRAISEMANDATORY",
        "QUANT60SECLOWERMANDATORY",
        "QUANT60SECRAISEMANDATORY",
    )
    # Deduplicate
    # We want one row per ['CONTRACTID', 'VERSIONNO']
    # Tie-breaker: greatest value of ['LASTCHANGED']
    .sort(["LASTCHANGED"], descending=False)
    .unique(subset=["CONTRACTID", "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:

CONTRACTID
VERSIONNO

PDR Loader configuration does not mention this table, so it is unclear how to choose which row to keep when there are multiple rows for a given set of primary keys.

You should probably take the row with the maximum LASTCHANGED.