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Ratings Information


NERC Alert Ratings TXT

Ratings

The Ratings text report provides the current ratings for all reportable facilities within the PJM operational footprint. The current ratings are obtained from the PJM Energy Management System and are changed to reflect system conditions.

Ratings TXT

Ratings Format

Column Name Column Definition
Company PJM EMS abbreviation of the designated Transmission Owner where the equipment resides, or equipment owner, for the equipment.
Substn The substation for the given equipment. For lines, the substation shown will usually be the first alphanumeric substation name. (Ex. A line going from Alpha substation to Bravo substation would be listed under Alpha. aka, PJM EMS B1 field.)
kV The voltage level for the given equipment expressed in kilovolts (kV). (aka, PJM EMS B2 field.)
Dev Device name, abridged to a maximum of 8 characters, for the PJM EMS equipment device name for the given equipment. (aka, PJM EMS B3 field.)
End PJM EMS END A or END B for a LINE, END A for a flow or series device or HIGH/LOW for a XFMR.
Descr Description of the equipment. (aka, PJM EMS B3 Text field.)
Degf Temperature set in degrees Fahrenheit.
Norm Continuous rating under Normal (NL) operating conditions. (See manual M-03: Section 2 re: Facility Ratings.)
Long Long Term Emergency (LTE) rating. (See manual M-03: Section 2 re: Facility Ratings.)
Shrt Short Term Emergency (STE) rating. (See manual M-03: Section 2 re: Facility Ratings.)
Dump Load Dump (LD) emergency rating. (See manual M-03: Section 2 re: Facility Ratings.)

Each temperature level has a separate set of ratings for day and night time operations.

Additional information on PJM operations related to thermal violations can be found in PJM Manual 03: Transmission Operations PDF.
 

Temporary Ratings

The Temporary Ratings report encompasses rating changes with limited durations, typically less than six months. The report contains active temporary changes as well as future changes. The estimated dates are provided to indicate when the temporary ratings are in effect. The facilities will revert to their permanent ratings upon the completion of the temporary rating change.

Temporary Ratings TXT

Temporary Ratings Format

Column Name Column Definition
Substn The substation for the given equipment. For lines, the substation shown will usually be the first alphanumeric substation name. (Ex. A line going from Alpha substation to Bravo substation would be listed under Alpha. aka, PJM EMS B1 field.)
kV The voltage level for the given equipment expressed in kilovolts (kV). (aka, PJM EMS B2 field.)
Dev Device name, abridged to a maximum of 8 characters, for the PJM EMS equipment device name for the given equipment. (aka, PJM EMS B3 field.)
End PJM EMS END A or END B for a LINE, END A for a flow or series device or HIGH/LOW for a XFMR.
Descr Description of the equipment. (aka, PJM EMS B3 Text field.)
Reason The reason for the ratings change. Available choices can be found in the Reasons for Rating Change text report.
Start IF Active: Date and time the ratings were made effective.
IF Future: Estimated date and time the ratings will be in effect.
Date is in MM/DD/YYYY format. Time is in 24 hour format.
Est. End Estimated date and time ratings are scheduled to end. The date is in the MM/DD/YYYY format. The time is in 24 hour format. 
Status The current status of the temporary rating request. The following statuses are displayed in the report: Active, Approved, and Awaiting Approval.
Degf Temperature set in degrees Fahrenheit.
Norm Continuous rating under Normal (NL) operating conditions. (See manual M-03: Section 2 re: Facility Ratings.)
Long Long Term Emergency (LTE) rating. (See manual M-03: Section 2 re: Facility Ratings.)
Shrt Short Term Emergency (STE) rating. (See manual M-03: Section 2 re: Facility Ratings.)
Dump Load Dump (LD) emergency rating. (See manual M-03: Section 2 re: Facility Ratings.)

Each temperature level has a separate set of ratings for day and night time operations.

Additional information on PJM operations related to thermal violations can be found in PJM Manual 03: Transmission Operations PDF.

Reasons for Rating Change

The Reasons for Rating Change report contains a list of the available reasons that can be selected for a rating change. PJM requires each rating change request to contain a reason for change. Reasons are periodically added and retired based on operational needs.

Please note that these reports are updated on a daily basis.

Reasons for Rating Change TXT


PJM Operations Rating Files

PJM Operations Rating Files zip includes Line Ratings, NERC Alert Changes, Temporary Line Ratings and Dynamic Ratings Forecast files. For transmission owners with Dynamic Line Ratings (DLR) equipment, the zipped file contains individual company files with DLR forecasted information for up to the next 48hrs. If, for any given equipment owner designated with having DLR facilities, no information was provided for the next 48hrs, an empty file will exist. Dynamic Ratings Forecast files are posted and updated as the files are uploaded in eDART.

PJM Operations Rating Files ZIP

Dynamic Ratings Forecast Format

Column Name Column Definition
HourEndGMT

End Hour for which the dynamic ratings are valid.
Time is in GMT

Station The substation for the given equipment. For lines, the substation shown will usually be the first alphanumeric substation name. (Ex. A line going from Alpha substation to Bravo substation would be listed under Alpha (aka, PJM EMS B1 field.)
Voltage The voltage level for the given equipment expressed in kilovolts (kV). (aka, PJM EMS B2 field.)
Equipment Description of the equipment. (aka, PJM EMS B3 Text field.)
End PJM EMS END A or END B for a LINE, END A for a flow or series device or HIGH/LOW for a XFMR.
Normal Continuous rating under Normal (NL) operating conditions. (See manual M-03: Section 2 re: Facility Ratings.)
LongTerm Long Term Emergency (LTE) rating. (See manual M-03: Section 2 re: Facility Ratings.)
ShortTerm Short Term Emergency (STE) rating. (See manual M-03: Section 2 re: Facility Ratings.)
LoadDump Load Dump (LD) emergency rating. (See manual M-03: Section 2 re: Facility Ratings.)

Ratings Format

Column Name Column Definition
Company PJM EMS abbreviation of the designated Transmission Owner where the equipment resides, or equipment owner, for the equipment.
Substn The substation for the given equipment. For lines, the substation shown will usually be the first alphanumeric substation name. (Ex. A line going from Alpha substation to Bravo substation would be listed under Alpha. aka, PJM EMS B1 field.)
kV The voltage level for the given equipment expressed in kilovolts (kV). (aka, PJM EMS B2 field.)
Dev Device name, abridged to a maximum of 8 characters, for the PJM EMS equipment device name for the given equipment. (aka, PJM EMS B3 field.)
End PJM EMS END A or END B for a LINE, END A for a flow or series device or HIGH/LOW for a XFMR.
Descr Description of the equipment. (aka, PJM EMS B3 Text field.)
Degf Temperature set in degrees Fahrenheit.
Norm Continuous rating under Normal (NL) operating conditions. (See manual M-03: Section 2 re: Facility Ratings.)
Long Long Term Emergency (LTE) rating. (See manual M-03: Section 2 re: Facility Ratings.)
Shrt Short Term Emergency (STE) rating. (See manual M-03: Section 2 re: Facility Ratings.)
Dump Load Dump (LD) emergency rating. (See manual M-03: Section 2 re: Facility Ratings.)

Each temperature level has a separate set of ratings for day and night time operations.

Additional information on PJM operations related to thermal violations can be found in PJM Manual 03: Transmission Operations PDF.

NERC Alert Changes

Column Name Column Definition
Substn The substation for the given equipment. For lines, the substation shown will usually be the first alphanumeric substation name. (Ex. A line going from Alpha substation to Bravo substation would be listed under Alpha. aka, PJM EMS B1 field.)
kV The voltage level for the given equipment expressed in kilovolts (kV). (aka, PJM EMS B2 field.)
Dev Device name, abridged to a maximum of 8 characters, for the PJM EMS equipment device name for the given equipment. (aka, PJM EMS B3 field.) 
End PJM EMS END A or END B for a LINE, END A for a flow or series device or HIGH/LOW for a XFMR. 
Descr Description of the equipment. (aka, PJM EMS B3 Text field.)
Status The current status of NERC Ratings Alert Changes. (Ex. Implemented.)
Reason The reason for the ratings change. Available choices can be found in the Reasons for Rating Change text report.
Est. Start Estimated date and time ratings are scheduled to start. Date is in MM/DD/YYYY format. Time is in 24 hour format.
Est. End Estimated date and time ratings are scheduled to end. The date is in the MM/DD/YYYY format. The time is in 24 hour format.
Act. Start Actual date and time ratings were made effective. Date is in MM/DD/YYYY format. Time is in 24 hour format.
Degf Temperature set in degrees Fahrenheit.
Norm Continuous rating under Normal (NL) operating conditions. (See manual M-03: Section 2 re: Facility Ratings.)
Long Long Term Emergency (LTE) rating. (See manual M-03: Section 2 re: Facility Ratings.)
Shrt Short Term Emergency (STE) rating. (See manual M-03: Section 2 re: Facility Ratings.)
Dump Load Dump (LD) emergency rating. (See manual M-03: Section 2 re: Facility Ratings.)

Each temperature level has a separate set of ratings for day and night time operations.

Additional information on PJM operations related to thermal violations can be found in PJM Manual 03: Transmission Operations PDF.

Temporary Line Ratings

Column Name Column Definition
Substn The substation for the given equipment. For lines, the substation shown will usually be the first alphanumeric substation name. (Ex. A line going from Alpha substation to Bravo substation would be listed under Alpha. aka, PJM EMS B1 field.)
kV The voltage level for the given equipment expressed in kilovolts (kV). (aka, PJM EMS B2 field.)
Dev Device name, abridged to a maximum of 8 characters, for the PJM EMS equipment device name for the given equipment. (aka, PJM EMS B3 field.)
End PJM EMS END A or END B for a LINE, END A for a flow or series device or HIGH/LOW for a XFMR.
Descr Description of the equipment. (aka, PJM EMS B3 Text field.)
Reason The reason for the ratings change. Available choices can be found in the Reasons for Rating Change text report.
Start IF Active: Date and time the ratings were made effective.
IF Future: Estimated date and time the ratings will be in effect.
Date is in MM/DD/YYYY format. Time is in 24 hour format.
Est. End Estimated date and time ratings are scheduled to end. The date is in the MM/DD/YYYY format. The time is in 24 hour format. 
Status The current status of the temporary rating request. The following statuses are displayed in the report: Active, Approved, and Awaiting Approval.
Degf Temperature set in degrees Fahrenheit.
Norm Continuous rating under Normal (NL) operating conditions. (See manual M-03: Section 2 re: Facility Ratings.)
Long Long Term Emergency (LTE) rating. (See manual M-03: Section 2 re: Facility Ratings.)
Shrt Short Term Emergency (STE) rating. (See manual M-03: Section 2 re: Facility Ratings.)
Dump Load Dump (LD) emergency rating. (See manual M-03: Section 2 re: Facility Ratings.)

Each temperature level has a separate set of ratings for day and night time operations.

Additional information on PJM operations related to thermal violations can be found in PJM Manual 03: Transmission Operations PDF.

Historical Ratings

Contains 4 historical zip files for previous posts around the PJM Ratings, PJM Temporary Ratings, PJM NERC Alert Ratings and Dynamic Rating Line Forecast (per DLR equipment owner).

Historical Ratings are available for 72-96 hours: