I don’t have access to the document by phone, but I did do a calculation to work out running costs of my aquariums.
I suspect for people with one tank, your running costs will be about the same as ~5 boiled kettles a day.
My fish room will work out at about 1.90£ a day, that with a 800w oil heater running for an assumed 3 hours a day. I’m replacing all lights with 2-4w gu10 LEDs. The filters are running off a piston air pump, but I’ve got some Eheim liberty filters on a few tanks, and they’re about 7w each. This was all calculated at around 39p a kWh, so it’s a little out.
I know this is going to be pricy this year, my advice to everyone who keep fish is to check the winter temperature of the fish they keep and set the heater to that. You’ll be surprised how cold it gets.