Need some input from sifus here.

Present my hitachi fridge(25 yrs old,
2 doors, 140cm tall). Not sure of
what model and capacity as the model
is at the back of the fridge.do not want to
move and see.

I need to change as
(1) to save power, the electrical
shop mention that the power can
be only 50%,after 25 yrs. how much i have
waste base on above info.
(2) not enough space capacity

However the fridge position cannot be
replace by a taller type, due to kitchen cabinet
was designed just 20cm above.
Wife strongly against to put the new
fridge to dinning hall.

Any suggestions? Can i just change
to same size and add in a smaller fridge?
will i safe power, overall?