Provided herein are systems and methods for producing ammonia fertilizer for culturing algae and aquaculture. The integrated systems provided herein can be installed on a hydrocarbon production platform and encompasses equipment and processes for generating electricity, preparation of an aqueous electrolyte, hydrogen generation by electrolysis, catalysis of ammonia formation, collection of ammonia, and optionally a nitrogen generator, and a plurality of subsystems for algae culture, and aquaculture.
