User blog comment:Water Fish 88/Different looking thermal plant and bioreactor/@comment-27538855-20160430121131/@comment-1500935-20160501134855

I don't know, I've never seen it available in the habitat builder's menus and haven't seen mention of it on the trello board for the past month. I hope too that it gets properly added later on, I'm all for power optimization in Subnautica.