SOS NERC Reliability Coordinator (RC) Exam Prep 2025–2026 | Complete Real Exam Questions + Correct Answers with Detailed Rationales | Latest Verified Version | 100% Pass Guarantee

SOS NERC PREP - RELIABILITY EXAM ANSWER KEY

A) Increase Net Interchange Schedule by 20 MWs.




The Reliability Coordinator
just informed you of a slow
time error correction which
will begin at the top of the
next hour. Your EMS system
will not let you change your
scheduled frequency. Your
Frequency Bias Setting is
-100 MW/.1Hz. What action
should you take?

A) Increase Net Interchange
Schedule by 20 MWs.

B) Inform the Reliability
Coordinator that you cannot
participate in the time error
correction.

C) Decrease Net Interchange
Schedule by 20 MWs.

D) Increase Net Interchange
Schedule by 10 MWs.

,SOS NERC PREP - RELIABILITY EXAM ANSWER KEY
C) 1 & 4




A Balancing Authority has a
sudden loss of a large block
of load in its area. This loss
will be seen instantaneously
in the change of which of the
following values?

1. Actual Net Interchange
2. Scheduled Frequency
3. Scheduled Net
Interchange
4. Area Control Error

A) 4 only
B) 1 & 3
C) 1 & 4
D) 3 & 4




A) Tie lines readings


Metered Data included in the
calculation of ACE are:
dynamic schedules, pseudo
ties, actual frequency, and all
__________.

A) Tie lines readings
B) Generators output
C) Scheduled frequency
indications
D) Transformer load

,SOS NERC PREP - RELIABILITY EXAM ANSWER KEY
A) -100



Balancing Authority A is
currently reading a system
frequency of 60.00 Hz. Its
Net Actual Interchange is
+100 MW and its Net
Scheduled Interchange is
+200 MW. If Balancing
Authority A's frequency bias
setting is 100 MW/0.1 Hz,
what is ACE?

A) -100
B) 0
C) 10
D) 100




B) 25 MWs in




A Balancing Authority has a
Net Interchange Schedule of
-250 MWs from 1200 to
1600 on a summer day. The
Net Interchange Actual for
those same hours
respectively were -230 MW,
-275 MW, -250 MW and
-270 MW. What was the
Balancing Authority's
Inadvertent Interchange for
the 4-hour period?

A) 6 MWs out
B) 25 MWs in
C) 25 MWs out
D) 6 MWs in

, SOS NERC PREP - RELIABILITY EXAM ANSWER KEY
D) Tie lines

For the ACE equation to
work properly, dynamic
schedules, pseudo ties,
frequency, and all
________________ must be
metered.

A) Generation
B) Communications
C) Transformers
D) Tie lines



B) The ACE will be a negative value and AGC will
increase generation




If the frequency bias setting
is set to a less negative value
than the frequency response
of a Balancing Authority and
a frequency increase is
caused by a sudden loss of
load in an external balancing
area, what will be the result?

A) The ACE will be zero and
will take no AGC action

B) The ACE will be a
negative value and AGC will
increase generation

C) The ACE will be a
positive value and AGC will
lower generation

D)This will not affect the
ACE