Apple wants to double the generation capacity of its fuel-cell plant next to its massive data center in Maiden, North Carolina.

The company has filed papers with the state’s utility regulators, notifying them of the plan to increase the size of the fuel-cell installation, which will bring its total capacity to 10MW, the Charlotte Observer reported.

The company is reportedly planning to use methane generated at a landfill as fuel for the fuel cells. According to the news report, it has contracted with Element Markets Renewable Energy (a methane producer) for fuel.

Houston-based Element Markets operates a facility that converts manure and other organic waste into methane in Stephenville, Texas, according to its website. Apple’s application, however, did not specify where its biogas in Maiden will come from.

Using biogas produced through anaerobic digestion of organic waste in fuel cells that power data centers is a novel and rare approach to data center power. When Apple initially announced its contact with Bloom Energy (its fuel-cell vendor) in Maiden, it did not say it would be using the fuel, which is considered a greener alternative to natural gas.

The news comes weeks after Microsoft announced a pilot project in Cheyenne, Wyoming, where it is installing a digester at a wastewater-treatment plant, which will create electricity for an ITPAC data center module the company plans to install at the site of the plant itself.

Landfill-produced methane is considered a renewable energy source by the North Carolina Utilities Commission, according to the Observer. It became so in March, after Bloom asked the regulators to make the official distinction.

Apple has started testing the initial 4.8MW fuel-cell phase in October. It plans to bring the additional capacity online in January.

The company will sell electricity its fuel cells produce to Duke Energy, the utility company that serves maiden.