Yes, because with the EPA and with all the systems that you have and the anti-pollution measures that are imposed on the natural gas truck, you have to put a DPF, you have to put a catalytic converter, and you have to put an SCR tank. Once you put all in these things, plus natural gas, you use a lot of electricity. If you're wondering why, it's because we have sensors everywhere to make sure there is no explosion. This is using batteries.
On March 13th, 2012. See this statement in context.