What we see is that the electric buses are going to be probably the propulsion of choice in the future. It's not something that is readily available right now. Right now, as we mentioned earlier, the challenge is with the batteries. The autonomy for the vehicles is not as high as you would get on a normal vehicle. On a normal transit bus in heavy operations, like the big cities, the bus will operate for 20 hours a day.
With batteries today, there isn't a possibility to power the bus for that long. In terms of technology, yes, we'll have to figure out—and that's what I think Chris was referring to—how we charge those vehicles. Do we keep them charged? Do we have all the capacity on the bus to keep them running for the 20 hours? Or do we do opportunity charging, so whenever we get a chance we give them a jolt of power to keep them running for the rest of the day?
Right now this technology is still emerging. We need to have some breakthroughs on the battery side, and we need to have some sort of standardization, although we can have a modular design for the different types of applications for electric buses.
The other technologies, like CNG, etc, are existing fuels and not something that really is a breakthrough in technology. It is something that is really an alternative to diesel, but not necessarily more environmentally friendly than the current fuels.
I don't know if that answers your question.