| Value | Category | Cases | |
|---|---|---|---|
| Batteries | 15 |
46.9%
|
|
| Batteries and electricity | 1 |
3.1%
|
|
| Diesel | 6 |
18.8%
|
|
| Gasoline | 3 |
9.4%
|
|
| None | 2 |
6.3%
|
|
| Solar | 5 |
15.6%
|