Image capturing apparatus and control method for the same

An image capturing apparatus comprises: an image capturing unit configured to generate image data; an adding unit configured to add additional information every predetermined amount of pixel data in the image data; a transmission unit configured to transmit image data by the amount of pixel data to which the additional information is added; an image processing unit configured to perform image processing on the image data; and a power control unit configured to control power supply when the transmission unit transmits the pixel data, based on the additional information, wherein the power control unit restricts the power supply to less than a predetermined power amount in a case where the additional information indicates a predetermined state, and performs power supply at the predetermined power amount in a case where the additional information does not indicate the predetermined state.