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Estimationstretch
Estimate how many public electric vehicle chargers California would need by 2030.
How to approach it
Go from expected EVs on the road to charging demand, then subtract home charging to find what public chargers must cover.
How a strong answer opens
“I'll go from expected EVs on the road in 2030 to the energy they need, subtract what people charge at home, and divide the rest by what one public charger can deliver.”
Outline of a strong answer
Try answering out loud for a few minutes before you open this.
- Clarify: public chargers, Level 2 and fast charging
- Estimate cars in California and an assumed EV share by 2030
- Estimate daily energy need per EV
- Share charged at home versus public
- Public charging demand / energy per charger per day
- Discuss how wrong the forecast might be
Where this question usually goes wrong
Assuming every EV charges in public, or that each charger is busy 24 hours a day, which throws the answer off several times over.
Learn the method
Worked cases 1 to 4 in Module 3, Estimation.
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