Public vs Home Charging: The True Cost Difference Might Surprise You

You hear it all the time: "Home charging is way cheaper than public charging." It's true as a general statement, but the actual numbers tell a more nuanced story. Sometimes public charging is free. Sometimes home electricity costs more than you'd think. Let's get specific.

Home Charging Costs

The national average residential electricity rate is about $0.16/kWh (it varies wildly by state, $0.10 in Louisiana, $0.32 in Massachusetts). If your EV gets 3.5 miles per kWh, here's what home charging costs per mile:

At $0.10/kWh: $0.029/mile
At $0.16/kWh: $0.046/mile
At $0.25/kWh: $0.071/mile
At $0.32/kWh: $0.091/mile

With time-of-use rates and off-peak charging, you can often cut these numbers by 30-50%. In many areas, off-peak rates drop to $0.06-$0.08/kWh, making home charging remarkably cheap.

Public Charging Costs

Public charging prices depend on the network, charger type, and whether you have a subscription:

Level 2 public (ChargePoint, Blink, etc.): $0.20-$0.40/kWh, or $1-$3/hour. Some locations are free (malls, hotels, employers). Cost per mile: $0.06-$0.11.

DC fast charging (Electrify America): $0.31-$0.43/kWh without a subscription. With the $4/month Pass+ plan: $0.24-$0.31/kWh. Cost per mile: $0.07-$0.12.

Tesla Superchargers: $0.25-$0.50/kWh depending on location and peak/off-peak. Tesla owners often get lower rates than non-Tesla vehicles. Cost per mile: $0.07-$0.14.

Side-by-Side Comparison (1,000 miles/month)

When Public Charging Makes Sense

Free charging. If your workplace, local mall, or apartment complex offers free Level 2 charging, take it. Free beats everything.

Road trips. You can't avoid fast chargers on road trips, and that's fine. The higher per-kWh cost for occasional travel doesn't significantly impact your annual charging budget.

Apartment dwellers. If you can't charge at home, public Level 2 charging at $0.25-$0.35/kWh is still 50-60% cheaper than gas per mile. It's not as cheap as home charging, but it's far from expensive.

The ROI of Home Charging

A Level 2 home charger costs $500-$1,500 installed. If home charging saves you $500-$1,000 per year compared to public charging, the installation pays for itself in 6-18 months. After that, it's pure savings for 10-20+ years.