PRC-010-1 Implementation Plan (Exhibit B)

Exhibit B
Implementation Plan

Implementation Plan
PRC-010-1 – Undervoltage Load Shedding
Standards Involved
Approval:
•

PRC-010-1 – Undervoltage Load Shedding

Retirements:
• PRC-010-0 – Assessment of the Design and Effectiveness of UVLS Program
• PRC-020-1 – Under-Voltage Load Shedding Program Database
• PRC-021-1 – Under-Voltage Load Shedding Program Data
• PRC-022-1 – Under-Voltage Load Shedding Program Performance
Prerequisite Approvals
• Revised definition of “Remedial Action Scheme” in Project 2010-05.2 – Special Protection
Systems (Phase 2 of Protection Systems)
Approval of the proposed definition of “Remedial Action Scheme” in Project 2010-05.2 – Special
Protection Systems (Phase 2 of Protection Systems) is required to align the classification of
centrally controlled undervoltage-based load shedding with the proposed definition of
“Undervoltage Load Shedding Program (UVLS Program)” below. The term “UVLS Program”
excludes centrally controlled undervoltage-based load shedding because the design and
characteristics of centrally controlled undervoltage-based load shedding are commensurate
with Special Protection Systems or Remedial Action Schemes. The proposed definition of
“Remedial Action Scheme” excludes “UVLS Programs.” As a result, the proposed definition of
“Remedial Action Scheme” clarifies that centrally controlled undervoltage-based load shedding
is included in its scope.
•

EOP-011-1 in Project 2009-03 – Emergency Operations
Project 2009-03 – Emergency Operations (EOP-011-1) proposes to retire EOP-003-2.
Requirements R2, R4, and R7 of EOP-003-2 are not included in EOP-011-1, since these
requirements map to PRC-010-1, Requirement R1. As a result, approval of EOP-011-1 is
necessary to prevent overlap with Requirement R1 of PRC-010-1.

Revisions to the NERC Glossary of Terms
The following new term is proposed for addition:
Undervoltage Load Shedding Program (UVLS Program): An automatic load shedding program,
consisting of distributed relays and controls, used to mitigate undervoltage conditions impacting the
Bulk Electric System (BES), leading to voltage instability, voltage collapse, or Cascading. Centrally
controlled undervoltage-based load shedding is not included.
Applicable Entities
• Planning Coordinator
• Transmission Planner
• UVLS entities – Distribution Providers and Transmission Owners responsible for the ownership,
operation, or control of UVLS equipment as required by the UVLS Program established by the
Transmission Planner or Planning Coordinator.
General Considerations
The effective dates of PRC-010-1 and its proposed new NERC Glossary term, EOP-011-1, the revised
NERC Glossary definition of “Remedial Action Scheme,” and each of the associated retirements are
intended to align to accommodate the needed transitions of standard coverage noted above.
The implementation plan for the revised definition of “Remedial Action Scheme” addresses entities
that will have newly identified Remedial Action Schemes resulting from the application of the defined
term with respect to the inclusion of centrally controlled undervoltage-based load shedding. Please
refer to the implementation plan posted with the definition of “Remedial Action Scheme” in Project
2010-05.2 – Special Protection Systems (Phase 2 of Protection Systems) for more information.
Effective Date
PRC-010-1 and the definition of “Undervoltage Load Shedding Program (UVLS Program)” shall become
effective on the first day of the first calendar quarter that is twelve (12) months after the date that the
standard and definition are approved by an applicable governmental authority or as otherwise
provided for in a jurisdiction where approval by an applicable governmental authority is required for a
standard to go into effect. Where approval by an applicable governmental authority is not required,
the standard and the definition shall become effective on the first day of the first calendar quarter that
is twelve (12) months after the date the standard and definition are adopted by the NERC Board of
Trustees or as otherwise provided for in that jurisdiction.

Implementation Plan for Project 2008-02 – Undervoltage Load Shedding

2

Retirement of Existing Standards:
PRC-010-0, PRC-020-1, PRC-021-1, and PRC-022-1 shall be retired at midnight of the day immediately
prior to the effective date of PRC-010-1 in the particular jurisdiction in which the new standard is
becoming effective.
PRC-010-1 is a consolidation of PRC-010-0 – Assessment of the Design and Effectiveness of UVLS
Program, PRC-020-1 – Under-Voltage Load Shedding Program Database, PRC-021-1 – Under-Voltage
Load Shedding Program Data, and PRC-022-1 – Under-Voltage Load Shedding Program Performance.

Implementation Plan for Project 2008-02 – Undervoltage Load Shedding

3