1. ICA Methodology Clarifications ICA Working Group 5/18/2016

2. ICA Working Group and Pilot Objectives
Identify ICA Methodology refinements: Pre-defining a specific methodology can limit stakeholder input and creativity
Incorporate IOUs improved ICA planning tools which have evolved since the DRP filing
Develop a process that can inform DER Planning
Develop a process that can replace Rule 21 Fast Track Process for individual DER interconnection evaluation
Focus on consistent criteria and results, recognizing tools may be different among the IOUs
Provide DER developers information that allows them to site DERs in locations with low risk of triggering distribution system upgrades as well provide utilities ability to plan for DER and effectively determine limitations to integrating future DER
ICA Methodology Clarifications Joint CA IOUs
18 May 2016

3. Slight modifications to the ruling supports innovation
Iterative powerflow techniques utilized by SDG&E and SCE should not be ruled out for use in the demonstration project
Ruling should allow IOUs to explore use of streamlined powerflow calculation techniques and iterative powerflow to demonstrate best solutions
The IOUs were asked in the ICA workshop and in ORA data requests how specific IOUs can improve through techniques used in the others’ approach. The ruling prescribes utilization of streamlined approach alone leading to concerns that learnings and enhancements to be gained in the demo could be stifled
PG&E EPIC 2.23 project (in coordination with Demo A) is exploring an alternative approach with the goal of enabling innovative, valid and accurate outcomes. The project and learnings could suffer if iterative simulations are not allowed to be included.
ICA Methodology Clarifications Joint CA IOUs
18 May 2016

4. Next Steps
IOUs seek flexibility to create and test the most effective ICA tools while incorporating stakeholder input given consistent criteria and results
IOUs believe iterative powerflow simulation and streamlined powerflow calculations techniques can both meet the intent of the ruling’s “baseline methodology”
IOUs suggest modifications to language as proposed below or other method to reflect this agreement
Per the ruling: The IOUs shall cooperate with the Energy Division’s Executive Director (or those Energy Division staff designated by the Energy Division’s Executive Director) to the extent clarifications or minor modifications are necessary to the pilot project requirements and/or working group guidance.
ICA Methodology Clarifications Joint CA IOUs
18 May 2016

5. Ruling Modifications/Clarifications
These modifications are suggested by the joint IOUs
Section
Existing Ruling Language
Proposed Language
1.3
Nodes shall be selected based on impedance factor, which is the measure of opposition that a circuit presents to electric current on application of voltage.
Nodes shall be selected based on impedance factor (which is the measure of opposition that a circuit presents to electric current on application of voltage), or structures in the distribution system.
2. Model and extract power system data
2. Model and extract power system data
4. Calculate ICA results and display on online map - The ICA calculations shall be performed using a layered abstraction approach where each criteria limit is calculated for each layer of the system independently and the most limiting values are used to establish the integration capacity limit.
4. Calculate ICA results and display on online map - The ICA calculations shall be performed using a layered abstraction streamlined and/or iterative power flow approach where each criteria limit is calculated for each layer of the system independently and the most limiting values are used to establish the integration capacity limit.
1.4
4. Granularity of ICA in Distribution System
a. Locational granularity of ICA is defined as line section or node level on the primary distribution system, as specified in the PG&E methodology.
ICA Methodology Clarifications Joint CA IOUs
18 May 2016

6. QUESTIONS?
ICA Methodology Clarifications Joint CA IOUs
18 May 2016