Enhanced Curtailment Calculator (ECC)

Jeremy WestSr. Operations Engineer

2

Learning Objectives

• History behind need for ECC• Review ECC proposed functionality• ECC interactions with scheduling

3

• 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

The Evolution of SOLs/IROLs in the West

4

What is the ECC?

• A reliability tool that Peak RC can use in conjunction with its other tools to ensure acceptable system performance

How will the ECC be implemented?

• Phase I – Situational awareness• Phase II – Enhanced curtailment / redispatch

Enhanced Curtailment Calculator (ECC)

5

Enhanced Curtailment Calculator (ECC)

• 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

What issues does ECC address?

6

ECC Phase I

• e-Tags• Dynamic Transfers• Network & Native Load

• Market Flows• ACE / RBC Flows• RSG Flows

• 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

7

• 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

ECC Phase II

8

• e-Tagging • Source/Sink Granularity

ECC Interactions with Scheduling

BA A

BA B

= Contract (On) Path = Off Path

BA A

BA B

9

• Dynamic Transfers• Catalog Effort for Peak• Telemetry• Forecast Data

• Dynamic Schedules – energy profile accuracy?• Pseudo-Ties – options

• e-Tag• Build in ECC• EIR Registration

ECC Interactions with Scheduling

10

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

ECCTF

11

https://www.peakrc.com/whatwedo/ECC/Pages/default.aspx

ECC Information