California Solar Initiative RD&D PV Integrated Storage: Demonstrating Mutually Beneficial Utility-Customer Business Partnerships Deepak Aswani May 4, 2017
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
Comparing TOD rate dispatch with and without Demand Response Non Participants Participants
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
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
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
Customer Benefit Jackson-Sunrise
Ratepayer Benefit Jackson-Sunrise
Backup
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
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”