1. Enhanced Curtailment Calculator (ECC)
Jeremy West Sr. Operations Engineer

2. Learning Objectives History behind need for ECC
Review ECC proposed functionality
ECC interactions with scheduling

3. The Evolution of SOLs/IROLs in the West
Prior to 2011:
No IROLs identified in the West
RC and TOPs primarily focused on Major WECC Transfer Paths
Equipment/Facility ratings not considered SOLs
April 2012 – RC SOL Methodology revised
SOLs – facility ratings, bus voltage and stability limits
IROLs – process for identification
August 2013 – RC SOL Methodology second revision
Improve processes for determining IROLs
Greater emphasis on determining acceptable pre- and post- Contingency operating conditions

4. Enhanced Curtailment Calculator (ECC)
A reliability tool that Peak RC can use in conjunction with its other tools to ensure acceptable system performance
What is the ECC?
Phase I – Situational awareness
Phase II – Enhanced curtailment / redispatch
How will the ECC be implemented?

5. Enhanced Curtailment Calculator (ECC)
What issues does ECC address?
webSAS Limitations
UFMP restricted to 6 Qualified Paths
TDFs based on seasonal models
Increased system awareness
Visibility of untagged flows
Incorporation of outage info (gen and trans)
Compliance
Address IRO and TOP standards
Address September 8 event recommendations

6. ECC Phase I Provides situational awareness to RC
Current hour – uses SE for topology
Look ahead hours – starts with SE topology but adds generator and transmission outage data
Visualizes “layers” of impacts
e-Tags
Market Flows
Dynamic Transfers
ACE / RBC Flows
Network & Native Load
RSG Flows

7. ECC Phase II Implementation of FERC-approved curtailment methodology
Transition from webSAS to ECC for support of UFMP on 6 Qualified Paths
Redispatch and curtailment to manage congestion on defined elements as needed to support reliability
Collaborative effort with entities when implemented

8. ECC Interactions with Scheduling
e-Tagging
Source/Sink Granularity
BA A
BA A
BA B
BA B
= Contract (On) Path
= Off Path

9. ECC Interactions with Scheduling
Dynamic Transfers
Catalog Effort for Peak
Telemetry
Forecast Data
Dynamic Schedules – energy profile accuracy?
Pseudo-Ties – options
e-Tag
Build in ECC
EIR Registration

10. ECCTF Task Force advising Peak on ECC Reorganized under Peak MAC
Chair → Raj Hundal
Meetings open to public

11. ECC Information