Filling up the oven

I fill the oven up to save money on my electric bill, on Sunday I cooked 2 pork joints, top shelf. 4 jacket potatoes, middle shelf, rice pudding & fruit crumble, bottom shelf. I also cooked beef in beer & a fruit cake. The oven was full all the time it was on, don't waste money on buying crappy frozen jacket potatoes & ready made crumble thinking you will save money on your fuel bills