N.I.E numbers are for life. Very important here.
To be able to buy a house, get on the health system,
have a car etc. you need one.
Only empadraments, and Residencia change or renewed?
I am surprised that your husband does not have an N.I.E
number already, having lived  and driven in Tarragona area, before moving to L'Aldea.
The offices in Tortosa, down by the river, are easy to access, even if you are disabled, and maybe in a wheelchair.