How Rate Design Affects Load Electric Vehicles & Customer Sited Generation at Riverside Public Utility September 18, 2018 Presented by: Tracy Sato, Utilities Integration Manager Riverside Public Utilities 1 RiversidePublicUtilities.com
The Challenge Need to Develop New Regulations City-Level Data New Rate Schedules State Level Data ? City Level Data 2 RiversidePublicUtilities.com
Residential EV Growth in Riverside (Light-Duty Vehicles Only) 2030 120,000 California Energy 37,500 EVs 107,000 MWhs Commission 100,000 Annual Demand (MWh) Model for EV 80,000 2025 Adoption 2030 17,300 EVs 17,500 EVs ------- 60,000 50,000 MWhs 50,000 MWhs Today Meet state goals - 2,000 EVs 40,000 5.5 MWhs 1.5 million EVs sold 2025 20,000 by 2025 and 8,600 EVs 25,000 MWhs 5 million EVs sold - 2018 2019 2020 2021 2022 2023 2024 2025 2026 2027 2028 2029 2030 by 2030 Low EV Demand (MWh) High EV Demand (MWh) 3 RiversidePublicUtilities.com
2019 Domestic and EV-Only TOU Rate Tariffs $0.35 Off-Peak Mid-Peak On-Peak Mid-Peak 11 pm to 6 am 6 am to 2 pm 2 pm to 7 pm 7 pm to 11 pm Riverside Public $0.30 Utility was in a rate EV-Only TOU $0.25 $0.26 setting process Rate ($/kWh) $0.19 ------- $0.20 DOM - Tier 3 DOM - Tier 2 How would these $0.15 $0.17 rates affect both $0.15 $0.10 DOM - Tier 1 adoption of $0.10 technology and $0.05 load profiles? $0.00 4 RiversidePublicUtilities.com
Residential EV Charging Characteristics Off-Peak Mid-Peak On-Peak Mid-Peak 11 pm to 6 am 6 am to 2 pm 2 pm to 7 pm 7 pm to 11 pm Small # of EVs Middling # of EVs High # of EVs Dec. # of EVs arriving home arriving home arriving home arriving home ------- ------- ------- ------- Long distance Short distance Longer distance Mid. distance 18% 50 45 % of Trips Arriving at Home 16% 40 14% Average Trip Miles 35 12% 30 10% 25 8% 20 6% 15 4% 10 2% 5 0% - 12:00 1:00 2:00 3:00 4:00 5:00 6:00 7:00 8:00 9:00 10:00 11:00 12:00 1:00 2:00 3:00 4:00 5:00 6:00 7:00 8:00 9:00 10:00 11:00 AM AM AM AM AM AM AM AM AM AM AM AM PM PM PM PM PM PM PM PM PM PM PM PM Percent of Trips Arriving Home Avg. Distance Driven 5 RiversidePublicUtilities.com
Unconstrained EV Charging Load 12 Off-Peak Mid-Peak On-Peak Mid-Peak Evening ramp 11 pm to 6 am 6 am to 2 pm 2 pm to 7 pm 7 pm to 11 pm 10 aligns with RPU’s Peak EV EV Charging Load (MWhs) peak daily load Evening Ramp Load 8 with Highest demand – when Impact on Costs residents arrive 6 home 4 ------- Peak Charging 2 occurs between 7 and 8 pm - 6 RiversidePublicUtilities.com
EV TOU Tariff & Residential Charging Patterns 12 Mid-Peak Off-Peak Mid-Peak On-Peak 7 pm to 11 pm 11 pm to 6 am 6 am to 2 pm 2 pm to 7 pm 10 Peak EV Load EV Charging Load (MWhs) Shifts and Increases 8 Goal of EV TOU Rate Encourage conservation 6 during On-peak hours 4 Load shifts to 2 later hours - 12:00 1:00 2:00 3:00 4:00 5:00 6:00 7:00 8:00 9:00 10:00 11:00 12:00 1:00 2:00 3:00 4:00 5:00 6:00 7:00 8:00 9:00 10:00 11:00 AM AM AM AM AM AM AM AM AM AM AM AM PM PM PM PM PM PM PM PM PM PM PM PM 7 RiversidePublicUtilities.com
Outcomes • Iterative process • Notable changes in forecast load and daily load shape due to design of the rate tariff • Provides significant information on directionality of change • Assumptions and uncertainty – Adoption rates, technological changes, consumer behavior – Interrelationship of inputs may be significant • More data, more data, more data 8 RiversidePublicUtilities.com
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