When Apple’s new massive campus, dubbed the Spaceship, opens for thousands of its employees next year in Cupertino, Calif., a small part of it will be powered by rows of big silver boxes containing fuel cells that generate energy through a chemical reaction.

The energy technology was developed and manufactured just a few miles away from Apple’s one-mile wide, still unfinished campus by the 15 year-old Silicon Valley company called Bloom Energy, Fortune has learned. Neither Apple nor Bloom Energy would comment on the Cupertino fuel cell project.

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