NERC RC LATEST 2026 EXAMINATION SETS QUESTIONS
AND SOLUTIONS RATED A+
✔✔What happens to ACE and AGC when the frequency bias setting is less negative
than the frequency response of a Balancing Authority and a frequency decline is caused
by a sudden loss of generation in an external balancing area? - ✔✔ACE will be a
positive value and AGC will lower generation
✔✔What is the normal schedule frequency? - ✔✔60.00 Hz
✔✔What is the frequency correction for fast clock schedule? - ✔✔59.98 Hz
✔✔What is the frequency corrections for a slow clock schedule? - ✔✔60.02 Hz
✔✔When does frequency increase? - ✔✔Generation increases or load decreases
✔✔When does frequency decrease? - ✔✔Generation decreases or load increases
✔✔Who is the Time Monitor? - ✔✔Can only be RC
one per Interconnection
✔✔Who is designated as Interconnection Time Monitor? - ✔✔Single RC designated by
NERC Operating Committee
✔✔When can a time error correction be cancelled? - ✔✔with 30% BAs in area requests
✔✔What is the minimum duration for time error correction? - ✔✔1 hour
✔✔When does time error correction start? - ✔✔On the hour or half-hour
✔✔What are the standards for time error correction? - ✔✔NAESB standards (North
American Energy Standards Board)
✔✔Who can request a termination? - ✔✔Any Reliability Coordinator
✔✔What is the notification time to start or stop a time error schedule? - ✔✔60 minutes
✔✔What is Tie-line Bias? - ✔✔Uses tie-line and frequency data
✔✔When is Flat Frequency used? - ✔✔Used when tie-line data is unavailable
Typically during islanded situations
✔✔When is Flat Tie-line used? - ✔✔When frequency data is unavailable
Typically during restoration situation
, ✔✔What should be done if AGC becomes inoperative? - ✔✔Use manual control to
maintain Net Scheduled Interchange
✔✔What is ISN Data? - ✔✔Data updated every 10 minutes
✔✔How often is ACE calculated - ✔✔Every 6 seconds
✔✔What is SOL / IROL correction time? - ✔✔Correction time < 30 minutes
✔✔What is the compliance score for DCS? - ✔✔100% minimum compliance score
✔✔What is the compliance score for CPS 1? - ✔✔100% minimum compliance score
✔✔What is the compliance score for CPS 2? - ✔✔90% minimum compiance score
✔✔What is the Disturbance Recovery Period? - ✔✔Time to restore ACE to pre-
disturbance value.
15 minutes
✔✔What is a Reportable Disturbance? - ✔✔Disturbance that exceeds 80% of MSSC.
✔✔What is the Penalty for not meeting recovery requirements? - ✔✔Carry additional
reserve for next quarter.
✔✔How are multiple contingencies treated? - ✔✔As a single contingency, if they occure
within 1 minute of each other
✔✔What is Spinning Reserve? - ✔✔Synchronized generation that can be online and
spinning in 15 minutes
✔✔What is Quick-start? - ✔✔Off-line generation synchronized in 15 minutes
✔✔What is Removable or Interruptible Load? - ✔✔Load that can be removed or
interrupted
✔✔What are Contingency & Operating Reserves? - ✔✔DCS reserves for emergencies
✔✔What is Regulating Reserve? - ✔✔CPS for normal operations
✔✔What is the time frame for DOE Reporting Initial report? - ✔✔60 minutes
✔✔What is the time frame for DOE Reporting Final report? - ✔✔48 hours
AND SOLUTIONS RATED A+
✔✔What happens to ACE and AGC when the frequency bias setting is less negative
than the frequency response of a Balancing Authority and a frequency decline is caused
by a sudden loss of generation in an external balancing area? - ✔✔ACE will be a
positive value and AGC will lower generation
✔✔What is the normal schedule frequency? - ✔✔60.00 Hz
✔✔What is the frequency correction for fast clock schedule? - ✔✔59.98 Hz
✔✔What is the frequency corrections for a slow clock schedule? - ✔✔60.02 Hz
✔✔When does frequency increase? - ✔✔Generation increases or load decreases
✔✔When does frequency decrease? - ✔✔Generation decreases or load increases
✔✔Who is the Time Monitor? - ✔✔Can only be RC
one per Interconnection
✔✔Who is designated as Interconnection Time Monitor? - ✔✔Single RC designated by
NERC Operating Committee
✔✔When can a time error correction be cancelled? - ✔✔with 30% BAs in area requests
✔✔What is the minimum duration for time error correction? - ✔✔1 hour
✔✔When does time error correction start? - ✔✔On the hour or half-hour
✔✔What are the standards for time error correction? - ✔✔NAESB standards (North
American Energy Standards Board)
✔✔Who can request a termination? - ✔✔Any Reliability Coordinator
✔✔What is the notification time to start or stop a time error schedule? - ✔✔60 minutes
✔✔What is Tie-line Bias? - ✔✔Uses tie-line and frequency data
✔✔When is Flat Frequency used? - ✔✔Used when tie-line data is unavailable
Typically during islanded situations
✔✔When is Flat Tie-line used? - ✔✔When frequency data is unavailable
Typically during restoration situation
, ✔✔What should be done if AGC becomes inoperative? - ✔✔Use manual control to
maintain Net Scheduled Interchange
✔✔What is ISN Data? - ✔✔Data updated every 10 minutes
✔✔How often is ACE calculated - ✔✔Every 6 seconds
✔✔What is SOL / IROL correction time? - ✔✔Correction time < 30 minutes
✔✔What is the compliance score for DCS? - ✔✔100% minimum compliance score
✔✔What is the compliance score for CPS 1? - ✔✔100% minimum compliance score
✔✔What is the compliance score for CPS 2? - ✔✔90% minimum compiance score
✔✔What is the Disturbance Recovery Period? - ✔✔Time to restore ACE to pre-
disturbance value.
15 minutes
✔✔What is a Reportable Disturbance? - ✔✔Disturbance that exceeds 80% of MSSC.
✔✔What is the Penalty for not meeting recovery requirements? - ✔✔Carry additional
reserve for next quarter.
✔✔How are multiple contingencies treated? - ✔✔As a single contingency, if they occure
within 1 minute of each other
✔✔What is Spinning Reserve? - ✔✔Synchronized generation that can be online and
spinning in 15 minutes
✔✔What is Quick-start? - ✔✔Off-line generation synchronized in 15 minutes
✔✔What is Removable or Interruptible Load? - ✔✔Load that can be removed or
interrupted
✔✔What are Contingency & Operating Reserves? - ✔✔DCS reserves for emergencies
✔✔What is Regulating Reserve? - ✔✔CPS for normal operations
✔✔What is the time frame for DOE Reporting Initial report? - ✔✔60 minutes
✔✔What is the time frame for DOE Reporting Final report? - ✔✔48 hours
