1. California Solar Initiative RD&D PV Integrated Storage: Demonstrating Mutually Beneficial Utility-Customer Business Partnerships
Deepak Aswani
May 4, 2017

2. Project Overview
The CSI RD&D Program was funded by the California Public Utilities Commission
Project objective: Evaluate customer-utility impacts of Solar + Energy Storage (including locational considerations)
Collaborative Modeling Effort
E3 – Financial analysis & Project Management
Sunverge – Data from 2500 R St
Rocky Mountain Institute – Powerflow analysis
Energy Solutions – Program design
SMUD – Scenario development

3. Comparing TOD rate dispatch with and without Demand Response
Non Participants
Participants

4. Feeders Selected for Modeling Jackson-Sunrise
Commercial customer
3.5 MVA peak
Originally 69kV service
Switch to 12kV service
69kV
Reduced ability to serve additional load growth. Local value in deferring upgrade from 6.25 MVA transformer to 12.5 MVA transformer
Jackson-Sunrise Substation
6.25 MVA
12kV
2.4 MVA peak load

5. Distribution System Modeling Electricity Distribution Grid Evaluator (EDGE)
DNV-GL Synergi Electric model used in SMUD 5 year planning
Export
EPRI OpenDSS
Black & Veatch Dispersion Analysis considering
Technical potential of DER
Multiple adoption scenarios
Rocky Mountain Institute’s Matlab-based tool for evaluating DER

6. Powerflow Modeling Results Waterman-Grantline
Nominal adoption
High adoption
SIS (Utility dispatch)
Energy losses
-0.6%
-1.2%
Capacitor switch events
+15.5%
Hours of capacitor operation
-55.6%
Power quality events
-3.1%
-4.1%
Substation peak
-0.3%
3x higher for Jackson-Sunrise

7. Customer Benefit Jackson-Sunrise

8. Ratepayer Benefit Jackson-Sunrise

9. Backup

10. Feeders Selected for Modeling Waterman-Grantline
69kV
Upgrade of additional 20 MVA bank anticipated. Local value in delay/deferral of upgrade.
Waterman-Grantline Sub. 20 MVA
12kV
11 MVA peak load
Expected 22 MVA peak load growth by 2025

11. Program Concepts Concept 1 Concept 2
Customer-owned systems with no utility maintenance responsibility
Monthly bill credit for enrollment in utility DR program
Equipment compatibility requirements
Concept 2
Revised rate design that better balances customer and ratepayer benefits
Incentive for enrolling in for “storage rate”