A storage control system, and a method of operation thereof, including: a host interface unit for receiving a host command from a host system; a power measurement hardware, coupled to the host interface unit, for reading a current value of electrical power supplied by the host system in response to the host command; and a power monitor controller, coupled to the power measurement hardware, for adjusting a bus speed for controlling data transfer through a channel shared by a number of non-volatile memory devices, the bus speed is adjusted based on the current value of the electrical power.