NERC Reliability Standards Time Requirements (2025/2026 Latest Update) | Study Guide & Key Concepts

NERC Reliability Standards Time Requirements Questions & Answer key
30 consecutive clock-minutes



Each Balancing Authority
shall operate such that its
clock-minute average of
Reporting ACE does not
exceed its clock-minute
Balancing Authority ACE
Limit (BAAL) for more
than _____, calculated in
accordance with
Attachment 2, for the
applicable Interconnection
in which the Balancing
Authority operates.




30 minutes



The Balancing Authority's
AGC shall compare total
Net Actual Interchange to
total Net Scheduled
Interchange plus
Frequency Bias obligation
to determine the
Balancing Authority's
ACE. Single Balancing
Authorities operating
asynchronously may
employ alternative ACE
calculations such as (but
not limited to) flat
frequency control. If a
Balancing Authority is
unable to calculate ACE
for more than _____ it
shall notify its Reliability
Coordinator.

, NERC Reliability Standards Time Requirements Questions & Answer key
6 seconds
The Balancing Authority
shall ensure that data
acquisition for and
calculation of ACE occur
at least every _____.


hourly




Each Balancing Authority
shall perform _____ error
checks using Tie Line
megawatt-hour meters
with common time
synchronization to
determine the accuracy of
its control equipment. The
Balancing Authority shall
adjust the component
(e.g., Tie Line meter) of
ACE that is in error (if
known) or use the
interchange meter error
(IME) term of the ACE
equation to compensate
for any equipment error
until repairs can be made.




annually
Each Balancing Authority
shall at least _____ check
and calibrate its time error
and frequency devices
against a common
reference.


hourly
Each Balancing Authority
shall calculate and record
_____ Inadvertent
Interchange.

, NERC Reliability Standards Time Requirements Questions & Answer key
hourly


Each Balancing Authority
shall ensure all of its
Balancing Authority Area
interconnection points are
equipped with common
megawatt-hour meters,
with readings provided
_____ to the control
centers of Adjacent
Balancing Authorities.




10 minutes

If a Balancing Authority
denies a Reliability
Adjustment Arranged
Interchange, the
Balancing Authority must
communicate that fact to
its Reliability Coordinator
no more than _____ after
the denial.



2 hours


Each Transmission
Service Provider shall
approve or deny each on-
time Arranged Interchange
or emergency Arranged
Interchange that it
receives and shall do so
prior to the expiration
_____ if submitted greater
than one hour after the
start time.