In Berlin there is a hybrid firetruck currently in use and the firefighter are really happy with it, only using the battery for about 90% of operations. Here is an English article about it (German ones are much more in depth):

https://www.electrive.com/2022/12/21/berlin-fire-brigade-goes-hybrid/

It is not mentioned in that article, but the firefighters really like the silence of the firetrucks. They didn’t need to yell as much and could therefore communicate much more efficiently.