Fact #912: February 15, 2016 Plug-in Vehicle Owners Take Advantage of Off-Peak Charging

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In the San Diego area, electricity rates are lowest between midnight and 5:00 am. Plug-in vehicles and charging equipment can be scheduled to begin charging when rates are lowest. Analysis of the EV Project data from the San Diego area showed a pronounced spike in charging after midnight, demonstrating the willingness of plug-in vehicle owners to schedule a delay for charging when there is a benefit. An example of typical weekday charging shows the peak for home charging demand of all study vehicles in the area was over one megawatt at 1:30 a.m.

Example of Typical Weekday Charging Demand for All EV Project Vehicles in the San Diego Area

Graphic showing example of typical weekday charging demand for all EV Project vehicles in the San Diego area.

Fact #912 Dataset

Supporting Information

Example of Typical Weekday Charging Demand for All EV Project Vehicles in the San Diego Area
Time of dayTotal Home Charging Demand (Megawatts)
6:00 a.m.0.03
6:150.03
6:300.03
6:450.04
7:00 a.m.0.03
7:150.04
7:300.04
7:450.04
8:00 a.m.0.04
8:150.05
8:300.05
8:450.05
9:00 a.m.0.05
9:150.05
9:300.05
9:450.05
10:00 a.m.0.05
10:150.05
10:300.05
10:450.05
11:00 a.m.0.06
11:150.06
11:300.06
11:450.06
12:00 p.m.0.06
12:150.07
12:300.07
12:450.07
1:00 p.m.0.08
1:150.08
1:300.08
1:450.08
2:00 p.m.0.08
2:150.08
2:300.09
2:450.09
3:00 p.m.0.09
3:150.10
3:300.11
3:450.11
4:00 p.m.0.12
4:150.13
4:300.14
4:450.14
5:00 p.m.0.15
5:150.16
5:300.17
5:450.17
6:00 p.m.0.18
6:150.19
6:300.19
6:450.19
7:00 p.m.0.20
7:150.20
7:300.20
7:450.20
8:00 p.m.0.20
8:150.20
8:300.20
8:450.20
9:00 p.m.0.19
9:150.19
9:300.18
9:450.17
10:00 p.m.0.18
10:150.17
10:300.16
10:450.15
11:00 p.m.0.16
11:150.16
11:300.15
11:450.15
12:00 a.m.0.70
12:150.85
12:300.85
12:450.83
1:00 a.m.1.10
1:151.11
1:301.07
1:451.02
2:00 a.m.0.97
2:150.91
2:300.83
2:450.75
3:00 a.m.0.66
3:150.57
3:300.47
3:450.37
4:00 a.m.0.29
4:150.22
4:300.15
4:450.10
5:00 a.m.0.06
5:150.05
5:300.04
5:450.03

Source: "Plugged In: How Americans Charge Their Electric Vehicles," Idaho National Laboratory, Report INL/EXT-15-35584, 2015, Page 17.

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