The clock on my range has never kept correct time, yet it keeps running and
using electricity. (Small amount, but many little things like this can add
up.)

So I pulled my electric range out from the wall, unplugged it, and
disconnected the clock. (Only do this if you know what you are doing.)

I already have many electronic things on power strips and turn off the power
strips when not in use. These things use electricity all the time...