Think of it like this, while that truck is running to a local fire, it’s using a fair amount of electric charge, but once it’s on scene, it only needs to power the emergency lights and a pump. Again, not a huge power suck compared to high load driving of a 50k lb truck. Now, like anything, chainsaws, cars, or even TVs, no single piece of equipment is going to work in every single scenario. But for local work, an EV is actually not a bad proposal. I’ve driven an EV class 8 tractor that had a useful range of 150 miles with an 80k gross. Clearly, that would be useless for an OTR but it would work for beverage delivery in say, Chicagoland or Dallas.
Now, I’ve got close experience with fire trucks running out of water instead of fuel…. My in-laws lost their house to a fire Christmas Day when they didn’t have enough water…… in a remote location where even an EV could have kept pumping but no water was available to pump.