That does not make sense.
When you either code the LED strip to all black, or turn it off, it loses its "memory" (like RAM) of what it was displaying before. It should generally default to black when you turn the power on.
Well turning it off will certainly make it black, but that means adding components capable of handling the total power of the LED strip such as a suitably rated (non-trivial) FET or a relay. Much easier to tell it to go black.
You haven't specified how many LEDs.
Operating from mains power, 300 LEDs drawing 300 mA at 5 V while dark is 1.5 W, hardly going to add much to your power bill.