By Ruth Reader, Tech.Mic.

Apple is doubling down on alternative energy at its new headquarters. In a updated environmental report, the company says the site will run entirely on solar energy and biogas fuel cells.

Where is all that energy coming from? The new campus will get 16 megawatts of power from rooftop solar panels, some of which will be affixed to the top of its two on-campus parking structures.

Parking structures on Apple's new campus. The one on the right features the solar panels.

In addition to solar power, the new headquarters will be powered by 4 megawatts of energy from biogas fuel cells, which turn hydrogen and oxygen into electricity. Between the onsite solar panels and the fuel cells, it should be able to generate approximately 75% of the energy it needs during peak day time hours to run its campus, according to an Apple representative. The company will get its remaining power from First Solar, a California solar farm. In 2015, Apple struck a $848 million deal with First Solar for 130 megawatts of power, Bloomberg reported.