Apple's new North Carolina data center will use Bloom Energy's fuel cells powered with landfill biogas. According to a recent Apple regulatory filing, Bloom Energy would supply 4.8 megawatts of fuel cells. CNET Reports:
To get biogas, Apple will need to procure it from a special supplier. The organic matter in landfills gives off methane (the primary ingredient of natural gas) as it decomposes, but that captured gas has to be cleaned and upgraded so that it's indistinguishable from natural gas. The biogas that Apple buys will be inserted and mixed into the natural gas pipeline, according to the filing.