Got this error while trying to use the mod. I also tested it with only base active and it still gives the error.

Failed to load mods: Error while loading item prototype "zelectric-transformer-power" (item): ItemPrototype::fuel_category was removed. Please use ItemPrototype::fuel_categories.
Modifications: ZElectricVehicles (quality fork)

Ignore the potentially fixed in the name of the discussion.

Alright I have figured out the problem. There was just something inputted wrong in the data.lua file.
fuel_category = "chemical",
Should be
fuel_categories = {"chemical"},

Was able to ask my buddy to help me figure it out so shout out to cheezeballs.