Transmission Loading Relief

1
Transmission Loading Relief Energy Emergency
Alerts

• Roger Harszy
• Director, Reliability Coordination

2
Understanding the Levels of Transmission Loading
Relief TLR
3
Transmission Loading Relief
TLR Levels
TLR Level 1 Energy Levels Across a Flowgate are
Approaching or Expected to Approach acceptable
operating limits

• TLR Level 2
• Hold Interchange Transactions at Current Levels
  to Prevent Operating Security Limit Violations
• Additional Information
• Only allowed to last for 20 minutes
• Seldom used if ever

4
Transmission Loading Relief
TLR Levels

• TLR Levels 3A 3B
• Curtail Non-firm Point-to-Point Transactions
  (pro-rata)
• Additional Information
• Curtailments are implemented
• TLR Level 3A - At the top of the upcoming hour.
• TLR Level 3B Immediately or as soon as
  possible
• Higher priority transactions are enabled to start
  by the reallocation process.
• Available NERC MRD Transactions are initiated.

5 or greater impact on the flowgate
5
Transmission Loading Relief
TLR Levels

• TLR Level 4
• Reconfigure transmission system and/or redispatch
  generation to allow Transactions using Firm
  Point-to-Point Transmission Service to continue.
• Additional Information
• All Transactions using Non-firm Point-to-Point
  Transmission Service are curtailed under a TLR
  Level 4
• Available MISO Flowgate Redispatch (FRD) cases
  are initiated.

5 or greater impact on the flowgate
6
Transmission Loading Relief
TLR Levels

• TLR Levels 5A 5B
• Curtail Firm Point-to-Point Transactions
  (pro-rata) to allow new Firm Point-to-Point
  Transactions to begin (pro-rata)
• Additional Information
• Curtailments are implemented
• TLR Level 5A - At the top of the upcoming hour.
• TLR Level 5B Immediately or as soon as
  possible
• Pro forma tariff requires curtailment on pro rata
  basis with Network Integration Transmission
  Service and Native Load.

5 or greater impact on the flowgate
7
Transmission Loading Relief
TLR Levels
TLR Level 6 Emergency Action. Voltage collapse,
cascading, or other emergency is imminent MISO
Actions Could include demand-side management,
emergency redispatch, voltage reductions,
interruptible and firm load shedding.
8
Transmission Loading Relief
TLR Levels
TLR Level 0 TLR Concluded. Restore all
transactions.
9
A Comparison of TLR Events ATCo
Companies vs. MISO vs. Eastern Interconnection
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EEA Alert Levels
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EEA Alert Levels

• EEA Alert Level 1 All available resources in
  use
• Circumstances
• All available resources are committed or
  expected to be committed - to meet firm load,
  firm transactions, and reserve commitments
• Non-firm wholesale energy sales (other than those
  that are recallable to meet reserve requirements)
  have been curtailed

17
EEA Alert Levels

• EEA Alert Level 2 Load Management Procedures
  in Effect
• Circumstances
• Control Area no longer able to provide customers
  expected energy requirements, and is designated
  an ENERGY DEFICIENT ENTITY
• ENERGY DEFICIENT ENTITY foresees or has
  implemented procedures up to, but excluding,
  interruption of firm load commitments. When time
  permits, these procedures may include, but are
  not limited to
• Public appeals to reduce demand
• Voltage reduction
• Interruption of non-firm end use loads in
  accordance with applicable contracts
• Demand-side management
• Utility load conservation measures

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EEA Alert Levels
EEA Alert Level 2 Load Management Procedures
in Effect During Alert 2, RELIABILITY
COORDINATORS, CONTROL AREAS, and ENERGY DEFICIENT
ENTITIES have the following responsibilities

• Notify other Control Areas and Market
  Participants
• ENERGY DEFICIENT ENTITY updates its RELIABILITY
  COORDINATOR of the situation every hour until the
  Alert 2 is terminated.
• CONTROL AREAS and market participants with
  available resources shall immediately contact the
  ENERGY DEFICIENT ENTITY.

For emergency, not economic, reasons
19
EEA Alert Levels
EEA Alert Level 2 Load Management Procedures
in Effect During Alert 2, RELIABILITY
COORDINATORS, CONTROL AREAS, and ENERGY DEFICIENT
ENTITIES have the following responsibilities

• Where appropriate, the RELIABILITY COORDINATORS
  shall inform the Transmission Providers of the
  pending ENERGY EMERGENCY and request that they
  increase their Available Transfer Capability
  (ATC)
• RELIABILITY COORDINATOR shall communicate and
  coordinate implementation of emergency operating
  responses
• Before declaring an Alert 3, the ENERGY DEFICIENT
  ENTITY must make use of all available resources
• Under an EEA Level 2, priority 6 transactions may
  be raised to priority 7

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EEA Alert Levels

• Alert 3 Firm load interruption imminent or in
  progress
• Circumstances
• ENERGY DEFICIENT ENTITY foresees or has
  implemented interruption of firm load
• Available energy is only accessible with actions
  taken to increase transmission transfer capacity.
  Actions include
• Continue actions from Alert 2.
• Use of Transmission short-time limits where
  possible without endangering the system
• Report listed in appendix 9B, Section C must be
  submitted to the RC within two business days of
  downgrading or termination of the Alert

21
Transmission Loading Relief Energy Emergency
Alerts

• Roger Harszy
• Director, Reliability Coordination