The famed Grade II listed building, which features four towering chimneys, is currently undergoing a multibillion-pound restoration.
The firm will become the largest office tenant at the former electricity generator, with 1,400 staff across six floors in the central boiler house. They will move in in 2021.
The former coal-fired power station has stood unoccupied for decades on the banks of the River Thames.
Apple employees will move from various London offices into the building in 2021, taking up 40% of the space within the power station.
Building work at the site is underway and overall the redevelopment has more than 8.5 million sq ft that is being used by both companies and also for residential development. As well as companies occupying the building there will also be shops, restaurants, hotels, and event spaces.
Donseed biometrics are being used to manage time and attendance on site. Workers are using mobile tablets when they enter and leave the site to ensure accurate hours are recorded and health and safety adhered to.