Electric+Bacteria

How might we use bacteria that can live off of electrons? https://www.newscientist.com/article/dn25894-meet-the-electric-life-forms-that-live-on-pure-energy/ http://www.popsci.com/have-we-found-alien-life https://www.newscientist.com/article/mg22329781-600-spark-of-life-revisited-thanks-to-electric-bacteria