How Rate Design Affects Load Electric Vehicles & Customer Sited - - PowerPoint PPT Presentation

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Electric Vehicles & Customer Sited Generation at Riverside Public Utility

September 18, 2018 Presented by: Tracy Sato, Utilities Integration Manager Riverside Public Utilities

How Rate Design Affects Load

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The Challenge

State Level Data City Level Data New Regulations Need to Develop City-Level Data New Rate Schedules

?

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Residential EV Growth in Riverside

(Light-Duty Vehicles Only)

• 20,000

40,000 60,000 80,000 100,000 120,000

2018 2019 2020 2021 2022 2023 2024 2025 2026 2027 2028 2029 2030

Annual Demand (MWh) Low EV Demand (MWh) High EV Demand (MWh)

Today 2,000 EVs 5.5 MWhs 2030 37,500 EVs 107,000 MWhs 2030 17,500 EVs 50,000 MWhs 2025 17,300 EVs 50,000 MWhs 2025 8,600 EVs 25,000 MWhs

California Energy Commission Model for EV Adoption

• Meet state goals -

1.5 million EVs sold by 2025 and 5 million EVs sold by 2030

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2019 Domestic and EV-Only TOU Rate Tariffs

$0.15 $0.26 $0.10 $0.17 $0.19 $0.00 $0.05 $0.10 $0.15 $0.20 $0.25 $0.30 $0.35 Rate ($/kWh)

Off-Peak

11 pm to 6 am

Mid-Peak

6 am to 2 pm

On-Peak

2 pm to 7 pm

Mid-Peak

7 pm to 11 pm

DOM - Tier 3 DOM - Tier 2 DOM - Tier 1

EV-Only TOU

Riverside Public Utility was in a rate setting process

• How would these

rates affect both adoption of technology and load profiles?

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Residential EV Charging Characteristics

• 5

10 15 20 25 30 35 40 45 50 0% 2% 4% 6% 8% 10% 12% 14% 16% 18%

12:00 AM 1:00 AM 2:00 AM 3:00 AM 4:00 AM 5:00 AM 6:00 AM 7:00 AM 8:00 AM 9:00 AM 10:00 AM 11:00 AM 12:00 PM 1:00 PM 2:00 PM 3:00 PM 4:00 PM 5:00 PM 6:00 PM 7:00 PM 8:00 PM 9:00 PM 10:00 PM 11:00 PM

Average Trip Miles % of Trips Arriving at Home

Off-Peak

11 pm to 6 am

Mid-Peak

6 am to 2 pm

On-Peak

2 pm to 7 pm

Mid-Peak

7 pm to 11 pm

Small # of EVs arriving home

• Long distance

Middling # of EVs arriving home

• Short distance
• Avg. Distance Driven

Percent of Trips Arriving Home High # of EVs arriving home

• Longer distance
• Dec. # of EVs

arriving home

• Mid. distance

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Unconstrained EV Charging Load

• 2

4 6 8 10 12 EV Charging Load (MWhs)

Off-Peak

11 pm to 6 am

Mid-Peak

6 am to 2 pm

On-Peak

2 pm to 7 pm

Mid-Peak

7 pm to 11 pm

Peak EV Load Evening Ramp with Highest Impact on Costs

Evening ramp aligns with RPU’s peak daily load demand – when residents arrive home

• Peak Charging
• ccurs between 7

and 8 pm

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EV TOU Tariff & Residential Charging Patterns

• 2

4 6 8 10 12

12:00 AM 1:00 AM 2:00 AM 3:00 AM 4:00 AM 5:00 AM 6:00 AM 7:00 AM 8:00 AM 9:00 AM 10:00 AM 11:00 AM 12:00 PM 1:00 PM 2:00 PM 3:00 PM 4:00 PM 5:00 PM 6:00 PM 7:00 PM 8:00 PM 9:00 PM 10:00 PM 11:00 PM

EV Charging Load (MWhs)

Off-Peak

11 pm to 6 am

Mid-Peak

6 am to 2 pm

On-Peak

2 pm to 7 pm

Mid-Peak

7 pm to 11 pm

Goal of EV TOU Rate Encourage conservation during On-peak hours

Load shifts to later hours Peak EV Load Shifts and Increases

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• Iterative process
• Notable changes in forecast load and daily load

shape due to design of the rate tariff

• Provides significant information on directionality
• f change
• Assumptions and uncertainty

– Adoption rates, technological changes, consumer behavior – Interrelationship of inputs may be significant

• More data, more data, more data

Outcomes