An updated plan for Apple's forthcoming "spaceship" campus has been published at the City of Cupertino website, and shows that Apple is planning to cover the roof in solar tiles, notes 9to5Mac. The roof is estimated to measure about 750,000 square feet, and if at least 500,000 is covered in solar cells, it's believed that Apple may be able to generate upwards of 5MW of power. The number also assumes 10W of power per square foot.