NERC Standard for BAL-006 Redline

Exhibit C
Redline of Reliability Standard BAL-006-2

Standard BAL-006-2 — Inadvertent Interchange

Introduction
1.

Title:

Inadvertent Interchange

2.

Number:

BAL-006-2

3.

Purpose:
This standard defines a process for monitoring Balancing Authorities to ensure that, over the
long term, Balancing Authority Areas do not excessively depend on other Balancing Authority
Areas in the Interconnection for meeting their demand or Interchange obligations.

4.

Applicability:
4.1.

5.
B.

Balancing Authorities.

Effective Date:

Requirements
R1. Each Balancing Authority shall calculate and record hourly Inadvertent Interchange.
(Violation Risk Factor: Lower)
R2. Each Balancing Authority shall include all AC tie lines that connect to its Adjacent Balancing
Authority Areas in its Inadvertent Interchange account. The Balancing Authority shall take
into account interchange served by jointly owned generators. (Violation Risk Factor: Lower)
R3. Each Balancing Authority shall ensure all of its Balancing Authority Area interconnection
points are equipped with common megawatt-hour meters, with readings provided hourly to the
control centers of Adjacent Balancing Authorities. (Violation Risk Factor: Lower)
R4. Adjacent Balancing Authority Areas shall operate to a common Net Interchange Schedule and
Actual Net Interchange value and shall record these hourly quantities, with like values but
opposite sign. Each Balancing Authority shall compute its Inadvertent Interchange based on
the following: (Violation Risk Factor: Lower)
R4.1. Each Balancing Authority, by the end of the next business day, shall agree with its
Adjacent Balancing Authorities to: (Violation Risk Factor: Lower)
The hourly values of Net Interchange Schedule. (Violation Risk Factor: Lower)
The hourly integrated megawatt-hour values of Net Actual Interchange. (Violation Risk
Factor: Lower)
R4.2. Each Balancing Authority shall use the agreed-to daily and monthly accounting data to
compile its monthly accumulated Inadvertent Interchange for the On-Peak and OffPeak hours of the month. (Violation Risk Factor: Lower)
R4.3. A Balancing Authority shall make after-the-fact corrections to the agreed-to daily and
monthly accounting data only as needed to reflect actual operating conditions (e.g. a
meter being used for control was sending bad data). Changes or corrections based on
non-reliability considerations shall not be reflected in the Balancing Authority’s
Inadvertent Interchange. After-the-fact corrections to scheduled or actual values will
not be accepted without agreement of the Adjacent Balancing Authority(ies).
(Violation Risk Factor: Lower)
R5. Adjacent Balancing Authorities that cannot mutually agree upon their respective Net Actual
Interchange or Net Scheduled Interchange quantities by the 15th calendar day of the following
month shall, for the purposes of dispute resolution, submit a report to their respective Regional
Reliability Organization Survey Contact. The report shall describe the nature and the cause of
the dispute as well as a process for correcting the discrepancy. (Violation Risk Factor: Lower)

Standard BAL-006-2

1

Standard BAL-006-2 — Inadvertent Interchange

C.

Measures
None specified.

D.

Compliance
1.

Compliance Monitoring Process
1.1.

Each Balancing Authority shall submit a monthly summary of Inadvertent Interchange.
These summaries shall not include any after-the-fact changes that were not agreed to
by the Source Balancing Authority, Sink Balancing Authority and all Intermediate
Balancing Authority(ies).

1.2.

Inadvertent Interchange summaries shall include at least the previous accumulation, net
accumulation for the month, and final net accumulation, for both the On-Peak and OffPeak periods.

1.3.

Each Balancing Authority shall submit its monthly summary report to its Regional
Reliability Organization Survey Contact by the 15th calendar day of the following
month.

1.4.

Each Balancing Authority shall perform an Area Interchange Error (AIE) Survey as
requested by the NERC Operating Committee to determine the Balancing Authority’s
Interchange error(s) due to equipment failures or improper scheduling operations, or
improper AGC performance.

1.5.

Each Regional Reliability Organization shall prepare a monthly Inadvertent
Interchange summary to monitor the Balancing Authorities’ monthly Inadvertent
Interchange and all-time accumulated Inadvertent Interchange. Each Regional
Reliability Organization shall submit a monthly accounting to NERC by the 22nd day
following the end of the month being summarized.

Standard BAL-006-2

2

Standard BAL-006-2 — Inadvertent Interchange

2.

Violation Severity Levels

R#

Lower VSL

Moderate VSL

High VSL

Severe VSL

R1.

N/A

N/A

N/A

Each Balancing Authority failed to
calculate and record hourly
Inadvertent Interchange.

R2.

N/A

N/A

The Balancing Authority failed to
include all AC tie lines that
connect to its Adjacent Balancing
Authority Areas in its Inadvertent
Interchange account.

The Balancing Authority failed to
include all AC tie lines that
connect to its Adjacent Balancing
Authority Areas in its Inadvertent
Interchange account.

OR

AND

Failed to take into account
interchange served by jointly
owned generators.

Failed to take into account
interchange served by jointly
owned generators.

R3.

N/A

N/A

N/A

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

R4.

The Balancing Authority failed to
record Actual Net Interchange
values that are equal but opposite
in sign to its Adjacent Balancing
Authorities.

The Balancing Authority failed to
compute Inadvertent Interchange.

The Balancing Authority failed to
operate to a common Net
Interchange Schedule that is equal
but opposite to its Adjacent
Balancing Authorities.

N/A

R4.1.

N/A

N/A

N/A

The Balancing Authority, by the
end of the next business day, failed
to agree with its Adjacent
Balancing Authorities to the hourly
values of Net Interchanged

Standard BAL-006-2

3

Standard BAL-006-2 — Inadvertent Interchange

R#

Lower VSL

Moderate VSL

High VSL

Severe VSL
Schedule.
AND
The hourly integrated megawatthour values of Net Actual
Interchange.

R4.1.1.

N/A

N/A

N/A

The Balancing Authority, by the
end of the next business day, failed
to agree with its Adjacent
Balancing Authorities to the hourly
values of Net Interchanged
Schedule.

R4.1.2.

N/A

N/A

N/A

The Balancing Authority, by the
end of the next business day, failed
to agree with its Adjacent
Balancing Authorities to the hourly
integrated megawatt-hour values of
Net Actual Interchange.

R4.2.

N/A

N/A

N/A

The Balancing Authority failed to
use the agreed-to daily and
monthly accounting data to
compile its monthly accumulated
Inadvertent Interchange for the OnPeak and Off-Peak hours of the
month.

R4.3.

N/A

N/A

N/A

The Balancing Authority failed to
make after-the-fact corrections to
the agreed-to daily and monthly
accounting data to reflect actual
operating conditions or changes or
corrections based on non-reliability
considerations were reflected in the
Balancing Authority’s Inadvertent

Standard BAL-006-2

4

Standard BAL-006-2 — Inadvertent Interchange

R#

Lower VSL

Moderate VSL

High VSL

Severe VSL
Interchange.

R5.

Adjacent Balancing Authorities
that could not mutually agree upon
their respective Net Actual
Interchange or Net Scheduled
Interchange quantities, submitted a
report to their respective Regional
Reliability Organizations Survey
Contact describing the nature and
the cause of the dispute but failed
to provide a process for correcting
the discrepancy.

Standard BAL-006-2

Adjacent Balancing Authorities
that could not mutually agree upon
their respective Net Actual
Interchange or Net Scheduled
Interchange quantities by the 15th
calendar day of the following
month, failed to submit a report to
their respective Regional
Reliability Organizations Survey
Contact describing the nature and
the cause of the dispute as well as a
process for correcting the
discrepancy.

N/A

N/A

5

Standard BAL-006-2 — Inadvertent Interchange

E.

Regional Differences
1.

Inadvertent Interchange Accounting Waiver approved by the Operating Committee on March
25, 2004includes SPP effective May 1, 2006.

Version History
Version

Date

Action

Change Tracking

0

April 1, 2005

Effective Date

New

0

August 8, 2005

Removed “Proposed” from Effective Date

Errata

1

April 6, 2006

Added following to “Effective Date:” This
standard will expire for one year beyond the
effective date or when replaced by a new version
of BAL-006, whichever comes first.

Errata

2

November 5, 2009

Added approved VRFs and VSLs to document.

Revision

Removed MISO from list of entities with an
Inadvertent Interchange Accounting Waiver
(Project 2009-18).
2

November 5, 2009

Approved by the Board of Trustees

2

January 6, 2011

Approved by FERC

Standard BAL-006-2

6