NERC Exam: Resource and Demand Balancing | Actual
Questions and Answers Latest Updated 2026/2027 (Graded A+)
•
The Control Performance Standards limit the width of the regulation boundaries for which of the
following?
- ✔✔ACE
•
Which of the following terms is defined as the scan rate values of a Balancing Authority's ACE
measured in MW, which includes the difference between the Balancing Authority's Net Interchange
Actual and its Net Interchange Scheduled, plus its Frequency Bias obligation, plus any known meter
error?
- ✔✔REPORTING ACE
•
Which of the following terms applies to the Western Interconnection only, and the addition of a
component to the ACE equation that modifies the control point for the purpose of continuously paying
back Primary Inadvertent Interchange to correct accumulated time error?
- ✔✔AUTOMATIC TIME ERROR CORRECTION
•
Each Balancing Authority must fulfill its commitment to the Interconnection and not __________the other
Balancing Authorities in the Interconnection.
- ✔✔BURDEN
•
Balancing Authority A is scheduled to import a net 200 MW and is actually importing a net 150 MW.
The Bias Setting is -100 MW/.1 HZ and Actual Frequency is 59.95 Hz. What is Balancing Authority A's
ACE reading?
- ✔✔0 MW
•
You are a Balancing Authority Operator. A neighboring Balancing Authority in the Interconnection
suddenly has a 500 MW generator trip due to a generator ground. What part of the ACE equation, ACE
= (NIA-NIS) - 10B (FA-FS) - IME, allows you and other Balancing Authorities in the Interconnection to
help stabilize the Interconnection frequency error?
- ✔✔10B(FA-FS)
•
A Balancing Authority has a tie-line meter that has been verified reading 5 MWs high. The flow on the
tie-line is out of the BA's Area. What effect will this have on the ACE reading?
- ✔✔ACE WILL READ 5 MW ABOVE ITS ACTUAL VALUE
•
Which of the following elements is NOT included in the ACE equations frequency component?
- ✔✔METER ERROR (IME)
, •
Balancing Authority B has a Net Interchange Schedule of 300 MW and a Frequency Bias of -80 MW/.1
Hz. A 400 MW generator in the BA's area trips resulting in a New Interchange Actual reading of -80
MW and frequency of 59.96 Hz. What is BA B's ACE?
- ✔✔-412 MW
•
Which statement best describes the CPS1 requirement?
- ✔✔THE RESPONSIBLE ENTITY MUST OPERATE SO ITS CPS1 IS GREATED THAN OR
EQUAL TO 100% FOR THE PRECEDING 12-MONTH PERIOD
•
The purpose of Reliability Standard BAL-001, which defines CPS1 and BAAL compliance
requirements is
- ✔✔TO CONTROL INTERCONNECTION FREQUENCY WITHIN DEFINED LIMITS
•
If a Balancing Authority does not comply with the Control Performance Standard, it is not permitted to
provide which of the following for any other Balancing Authority entities?
- ✔✔REGULATION OF OTHER SERVICES RELATED TO CONTROL PERFORMANCE
•
What happens when a Balancing Authority is being evaluated for its CPS1 Control Performance, and a
sustained interruption in the recording of ACE or Frequency Deviation due to loss of telemetering or
computer unavailability results in a one-minute interval not containing at least 50% of samples of both
ACE and Frequency Deviation?
- ✔✔THE ONE MINUTE INTERVAL IS EXCLUDED FROM THE CPS1 CALCULATION
•
A Balancing Authority's CPS1 calculation is computed using its clock-minute average of two values.
What are those two values?
- ✔✔REPORTING ACE AND FREQUENCY ERROR
•
A Balancing Authority is slightly undergenerating its Actual System Frequency (FA) is 60.03 Hz. What
is the result of the Balancing Authority's action?
- ✔✔THE BALANCING AUTHORITY IS HELPING THE INTERCONNECTION FREQUENCY
•
A Balancing Authority has an ACE of -50 MW when Interconnection frequency is 60.04 Hz. Is the BA in
danger of exceeding the Balancing Authority ACE Limit (BAAL)?
- ✔✔NO, THERE IS NO LOW BAAL WHEN FREQUENCY IS HIGH
•
To conform to CPS requirements, a Balancing Authority must have which of the following?
- ✔✔CSP1 GREATER THAN OR EQUAL TO 100% AND ACE DOES NOT EXCEED BAAL MORE
THAN 30 CONSECUTIVE MINUTES
Questions and Answers Latest Updated 2026/2027 (Graded A+)
•
The Control Performance Standards limit the width of the regulation boundaries for which of the
following?
- ✔✔ACE
•
Which of the following terms is defined as the scan rate values of a Balancing Authority's ACE
measured in MW, which includes the difference between the Balancing Authority's Net Interchange
Actual and its Net Interchange Scheduled, plus its Frequency Bias obligation, plus any known meter
error?
- ✔✔REPORTING ACE
•
Which of the following terms applies to the Western Interconnection only, and the addition of a
component to the ACE equation that modifies the control point for the purpose of continuously paying
back Primary Inadvertent Interchange to correct accumulated time error?
- ✔✔AUTOMATIC TIME ERROR CORRECTION
•
Each Balancing Authority must fulfill its commitment to the Interconnection and not __________the other
Balancing Authorities in the Interconnection.
- ✔✔BURDEN
•
Balancing Authority A is scheduled to import a net 200 MW and is actually importing a net 150 MW.
The Bias Setting is -100 MW/.1 HZ and Actual Frequency is 59.95 Hz. What is Balancing Authority A's
ACE reading?
- ✔✔0 MW
•
You are a Balancing Authority Operator. A neighboring Balancing Authority in the Interconnection
suddenly has a 500 MW generator trip due to a generator ground. What part of the ACE equation, ACE
= (NIA-NIS) - 10B (FA-FS) - IME, allows you and other Balancing Authorities in the Interconnection to
help stabilize the Interconnection frequency error?
- ✔✔10B(FA-FS)
•
A Balancing Authority has a tie-line meter that has been verified reading 5 MWs high. The flow on the
tie-line is out of the BA's Area. What effect will this have on the ACE reading?
- ✔✔ACE WILL READ 5 MW ABOVE ITS ACTUAL VALUE
•
Which of the following elements is NOT included in the ACE equations frequency component?
- ✔✔METER ERROR (IME)
, •
Balancing Authority B has a Net Interchange Schedule of 300 MW and a Frequency Bias of -80 MW/.1
Hz. A 400 MW generator in the BA's area trips resulting in a New Interchange Actual reading of -80
MW and frequency of 59.96 Hz. What is BA B's ACE?
- ✔✔-412 MW
•
Which statement best describes the CPS1 requirement?
- ✔✔THE RESPONSIBLE ENTITY MUST OPERATE SO ITS CPS1 IS GREATED THAN OR
EQUAL TO 100% FOR THE PRECEDING 12-MONTH PERIOD
•
The purpose of Reliability Standard BAL-001, which defines CPS1 and BAAL compliance
requirements is
- ✔✔TO CONTROL INTERCONNECTION FREQUENCY WITHIN DEFINED LIMITS
•
If a Balancing Authority does not comply with the Control Performance Standard, it is not permitted to
provide which of the following for any other Balancing Authority entities?
- ✔✔REGULATION OF OTHER SERVICES RELATED TO CONTROL PERFORMANCE
•
What happens when a Balancing Authority is being evaluated for its CPS1 Control Performance, and a
sustained interruption in the recording of ACE or Frequency Deviation due to loss of telemetering or
computer unavailability results in a one-minute interval not containing at least 50% of samples of both
ACE and Frequency Deviation?
- ✔✔THE ONE MINUTE INTERVAL IS EXCLUDED FROM THE CPS1 CALCULATION
•
A Balancing Authority's CPS1 calculation is computed using its clock-minute average of two values.
What are those two values?
- ✔✔REPORTING ACE AND FREQUENCY ERROR
•
A Balancing Authority is slightly undergenerating its Actual System Frequency (FA) is 60.03 Hz. What
is the result of the Balancing Authority's action?
- ✔✔THE BALANCING AUTHORITY IS HELPING THE INTERCONNECTION FREQUENCY
•
A Balancing Authority has an ACE of -50 MW when Interconnection frequency is 60.04 Hz. Is the BA in
danger of exceeding the Balancing Authority ACE Limit (BAAL)?
- ✔✔NO, THERE IS NO LOW BAAL WHEN FREQUENCY IS HIGH
•
To conform to CPS requirements, a Balancing Authority must have which of the following?
- ✔✔CSP1 GREATER THAN OR EQUAL TO 100% AND ACE DOES NOT EXCEED BAAL MORE
THAN 30 CONSECUTIVE MINUTES
