A computer or desktop computer uses around 300 to 500 watts of electricity per hour depending on what you're using the computer for.
At 300 watts per hour the computer would use 7,200 watts of electricity in 24 hours which would cost me $21.00 per month.
I could save that $21.00 per month by shutting off my computer at night or when not in use but I think it's worth the $21.00 per month to keep the desktop computer running all the time and available for use.
My computer sometimes takes forever to boot back up after shutting down so I just leave it on.