Single Line Diagrams Interconnection Discussion Forum December 2019 1 Overview Current process Process improvements Implementation proposals Existing Practices PVPaired Storage 3 PGampE ID: 1029989
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1. PV-Paired Storage ProjectsSingle Line DiagramsInterconnection Discussion ForumDecember 20191
2. OverviewCurrent processProcess improvementsImplementation proposals
3. Existing Practices – PV-Paired Storage 3 PG&ESCESDG&ETemplate diagram employed for standard NEMCustom diagram submitted for NEM-ST, NEM-MT, NEMA, and Expanded NEMNo template diagram for any scenarioAll projects require custom diagram be submittedTemplate diagram employed for standard NEMCustom diagram submitted for NEM-ST, NEM-MT, NEMA, and Expanded NEM
4. Standard NEM Template Diagrams4 PG&ESDG&E
5. Process ImprovementsReduce deficiency rateExisting equipment confirmed in application portal and existing utility recordsImproved review timelines – batteries online quicker5
6. Implementation Proposals6 Templates by scenarioAC / DC coupledUninterruptible power supplyStandby generatorsTemplates by contractor or CSLB NumberTemplates within sizing threshold (up to 30 kW)Custom diagrams can still be submitted when necessary
7. Sample Template Diagrams7 Retrofit (Existing PV) AC CoupledStandalone (No PV) AC Coupled
8. Energy Storage Site InspectionsInterconnection Discussion ForumDecember 20198
9. Inspection Process9 Occurs at utility’s discretionCommon when AC disconnect(s) includedRequires additional coordination between customer, contractor and utility
10. Photos provided in place of duplicate inspectionsFinal building inspection record satisfies utility inspectionAcknowledge UL certified equipmentVisit site after storage device is operationalProposed Alternatives10
11. Benefits to Removing Utility InspectionRemoves timeline for additional inspection to occur – quicker PTOImproves customer experience – protected from shutoffs sooner11
12. Sample Inspection Photos12