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This section must be completed by the Compliance Monitor Administrator.

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Req.
R1.
R2.
R3.
R4.
R5.
Finding Summary & Documentation
Functions
Monitored
BA
BA
BA
BA
BA
R6.
BA
Req. Recommendations
Req. Areas of Concern
Subject Matter Experts
Identify Subject Matter Expert(s) responsible for this Reliability Standard. (Insert additional rows if necessary)
Registered Entity Response (Required) :
Organization Requirement(s) SME Name Title
R1 Supporting Evidence and Documentation
R1. Each Balancing Authority shall review its Frequency Bias Settings by January 1 of each year and recalculate its setting to reflect any change in the Frequency Response of the Balancing Authority Area.
R1.1. The Balancing Authority may change its Frequency Bias Setting, and the method used to determine the setting, whenever any of the factors used to determine the current bias value change.
R1.2. Each Balancing Authority shall report its Frequency Bias Setting, and method for determining that setting, to the WECC Operating Committee.
Registered Entity Response ( Required ):
Describe, in narrative form, how you meet compliance with this requirement.

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Registered Entity Evidence (Required) :
Provide the following for all evidence submitted (Insert additional rows if necessary):
File Name, File Extension, Document Title, Revision, Date, Page(s), Section(s), Section Title(s), Description
Compliance Assessment Approach
This section must be completed by the Compliance Monitor Administrator
Review the evidence to verify the Registered Entity has:
Verify the date when the Balancing Authority last reviewed its Frequency Bias Setting.
Confirm that the Balancing Authority reported to the WECC Operating Committee (through the channels appropriate to the region) the most recent Frequency Bias Setting Methodology it used to determine the setting(s).
Compliance Summary:
(Finding Summary):
Primary Documents Supporting Finding:
Auditor Notes:
R2 Supporting Evidence and Documentation
R2. Each Balancing Authority shall establish and maintain a Frequency Bias Setting that is as close as practical to, or greater than, the Balancing Authority’s Frequency Response. Frequency Bias may be calculated several ways:
R2.1. The Balancing Authority may use a fixed Frequency Bias value which is based on a, straight-line function of Tie Line deviation versus Frequency Deviation. The Balancing Authority shall determine the fixed value by observing and averaging the Frequency Response for several
Disturbances during on-peak hours.
R2.2. The Balancing Authority may use a variable (linear or non-linear) bias value, which is based on a variable function of Tie Line deviation to Frequency Deviation. The Balancing Authority shall determine the variable frequency bias value by analyzing Frequency Response as it varies with factors such as load, generation, governor, and frequency.

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Registered Entity Response ( Required ):
Describe, in narrative form, how you meet compliance with this requirement.
Registered Entity Evidence (Required) :
Provide the following for all evidence submitted (Insert additional rows if necessary):
File Name, File Extension, Document Title, Revision, Date, Page(s), Section(s), Section Title(s), Description
Question: Provide a detailed description of the methodology used to determine your Frequency Bias Setting to ensure you are as close as practical to, or greater than your Frequency Response.
Compliance Assessment Approach
This section must be completed by the Compliance Monitor Administrator
Review the evidence to verify the Registered Entity has:
Review the Frequency Bias setting to determine the setting is as close as practical to, or greater than, the
Balancing Authorities Frequency Response.
Confirm if the Balancing Authority has calculated the Frequency Bias value based on one of the methodologies outlined in R2.1 or R2.2.
Compliance Summary:
(Finding Summary):
Primary Documents Supporting Finding:
Auditor Notes:
R3 Supporting Evidence and Documentation
R3. Each Balancing Authority shall operate its Automatic Generation Control (AGC) on Tie Line Frequency
Bias, unless such operation is adverse to system or Interconnection reliability.
Registered Entity Response ( Required ):
Describe, in narrative form, how you meet compliance with this requirement.

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Registered Entity Evidence (Required) :
Provide the following for all evidence submitted (Insert additional rows if necessary):
File Name, File Extension, Document Title, Revision, Date, Page(s), Section(s), Section Title(s), Description
Compliance Assessment Approach
This section must be completed by the Compliance Monitor Administrator
Review the evidence to verify the Registered Entity has:
Confirm that the Balancing Authority routinely operated their AGC on Tie Line Frequency Bias mode during the audited period
Confirm that any operation outside of Tie Line Bias method was done to avoid adverse or Interconnection reliability
Compliance Summary:
(Finding Summary):
Primary Documents Supporting Finding:
Auditor Notes:
R4 Supporting Evidence and Documentation
R4. Balancing Authorities that use Dynamic Scheduling or Pseudo-ties for jointly owned units shall reflect their respective share of the unit governor droop response in their respective Frequency Bias Setting.
R4.1. Fixed schedules for Jointly Owned Units mandate that Balancing Authority (A) that contains the
Jointly Owned Unit must incorporate the respective share of the unit droop response for any
Balancing Authorities that have fixed schedules (B and C). See the diagram below.
R4.2. The Balancing Authorities that have a fixed schedule (B and C) but do not contain the Jointly
Owned Unit shall not include their share of the governor droop response in their Frequency Bias
Setting.
Registered Entity Response ( Required ):
Describe, in narrative form, how you meet compliance with this requirement.
Registered Entity Evidence (Required) :
Provide the following for all evidence submitted (Insert additional rows if necessary):
File Name, File Extension, Document Title, Revision, Date, Page(s), Section(s), Section Title(s), Description

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Compliance Assessment Approach
This section must be completed by the Compliance Monitor Administrator
Review the evidence to verify the Registered Entity has:
Determine if the Balancing Authority has jointly owned unit(s) located in its balancing area and/or another entity’s footprint. (If not, this requirement is N/A)
For Balancing Authorities that use Dynamic Scheduling or Pseudo Ties:
Confirm the Balancing Authority reflects their respective share of the units’ droop response in their respective Frequency Bias Setting.
Confirm the host Balancing Authority does not include other entities’ shares of the droop response in their
Frequency Bias Settings.
For Balancing Authority using fixed Schedules for jointly owned units, the host BA must:
Incorporate the respective share of the unit governor droop response for the other BAs
For Balancing Authority using fixed Schedules for jointly owned units, which are not contained within their BA:
Shall not incorporate their respective share of the unit governor droop response.
Compliance Summary:
(Finding Summary):
Primary Documents Supporting Finding:
Auditor Notes:
R5 Supporting Evidence and Documentation
R5. Balancing Authorities that serve native load shall have a monthly average Frequency Bias Setting that is at least 1% of the Balancing Authority’s estimated yearly peak demand per 0.1 Hz change.
R5.1. Balancing Authorities that do not serve native load shall have a monthly average Frequency Bias
Setting that is at least 1% of its estimated maximum generation level in the coming year per 0.1
Hz change.
Registered Entity Response ( Required ):
Describe, in narrative form, how you meet compliance with this requirement.
Registered Entity Evidence (Required) :
Provide the following for all evidence submitted (Insert additional rows if necessary):
File Name, File Extension, Document Title, Revision, Date, Page(s), Section(s), Section Title(s), Description

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Compliance Assessment Approach
This section must be completed by the Compliance Monitor Administrator
Review the evidence to verify the Registered Entity has:
Identify if the Balancing Authority serves native load. If so:
Confirm that the Frequency Bias setting is at least 1% of the Balancing Authority’s estimated yearly peak demand per 0.1 Hz change.
For Balancing Authorities which do not serve native load:
Confirm that the Frequency Bias Setting is at least 1% of its estimated maximum generation level in the coming year per 0.1 Hz change.
Note to Auditor: CEAs should be aware that the BA may select a fixed Frequency Bias Setting (constant through the year) per BAL-003 R2.1 or a variable Frequency Bias Setting (which varies with load, dispatch, and other factors) per BAL-003 R2.2.
Regardless of whether a registered entity uses a fixed or variable Frequency Bias Setting, the Frequency Bias
Setting must meet the 1% criteria specified in R5 and R5.1. The determined value must be compared to the minimum Frequency Bias Setting prescribed in BAL-003 R5. The CEA is to verify that the BA used in its ACE equation a Frequency Bias Setting based on the largest of:
• the absolute value of their estimated Frequency Response, or
• for BAs serving native load, the absolute value of 1% of their projected peak demand for the coming year, or
• for BAs that do not serve native load, the absolute value of 1% of their maximum expected generation level for the coming year per 0.1 Hz change.
A CEA is to obtain reasonable assurance of the entity’s compliance by assessing the calculations used to determine their Frequency Response to interconnection frequency deviations. For fixed Frequency Bias
Settings, the CEA should verify that the data used to estimate Frequency Response used data from on-peak periods, and that it produced a value representative of actual Frequency Response. For variable Frequency
Bias Settings, the CEA should verify that the assumptions used in developing the Frequency Response model are reasonable, and that the Frequency Bias Setting appropriately takes into account current conditions such that the resultant Frequency Bias Setting is representative of actual Frequency Response.
CEAs are also to verify the entity correctly evaluated Frequency Bias Setting as an absolute value, and the entity determined its Frequency Bias Setting as the greater of its estimated Frequency Response or the minimums established in Requirement R5.
CEAs may request evidence of all steps in the calculation, including any events that occurred in past year to determine its Frequency Bias.
For technical reference, see NERC Technical Document “Balancing Frequency and Control,” January 26, 2011.
Compliance Summary:
(Finding Summary):
Primary Documents Supporting Finding:

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Auditor Notes:
R6 Supporting Evidence and Documentation
R6. A Balancing Authority that is performing Overlap Regulation Service shall iWCRease its Frequency
Bias Setting to match the frequency response of the entire area being controlled. A Balancing
Authority shall not change its Frequency Bias Setting when performing Supplemental Regulation
Service.
Registered Entity Response ( Required ):
Describe, in narrative form, how you meet compliance with this requirement.
Registered Entity Evidence (Required) :
Provide the following for all evidence submitted (Insert additional rows if necessary):
File Name, File Extension, Document Title, Revision, Date, Page(s), Section(s), Section Title(s), Description
Compliance Assessment Approach
This section must be completed by the Compliance Monitor Administrator
Review the evidence to verify the Registered Entity has:
Identify if the Balancing Authority performs Overlap Regulation Service or Supplemental Regulation
Service.
Confirm that the Balancing Authority performing Overlap Regulation Service, has adjusted its Frequency
Bias setting to match the frequency response to the entire area being controlled.
Confirm that the Balancing Authority has not adjusted its Frequency Bias setting while performing
Supplemental Regulation Service.
Compliance Summary:
(Finding Summary):
Primary Documents Supporting Finding:
Auditor Notes:

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Other - The list of questions above is not all inclusive of evidence required to show compliance with the
Reliability Standard. Provide additional information here, as necessary that demonstrates compliance with this
Reliability Standard.
RSAW Revision History
Revision Date
October 2, 2015 RSAW content & format.
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