Hmmm if by acquired you mean bought a new one you will see an instant effect on your electricity bills v. a 25 yo one. I forget how much but I think my new freezer used about a third of what the old one did, and was going to pay for itself in around a year - and that was when costs were a bit lower!
This page wasn't far out for my 33 yo freezer, I was able to get the precise figures by using a plug in device to show consumption over a period.
www.sust-it.net/running-costs-of-old-appliances.php
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