By Øystein Alnes, Sverre Eriksen, and Bjørn-Johan Vartdal A class society perspective. Digital Object Identifier 10.1109/MELE.2017.2718823 Date of publication: 5 September 2017 10 I E E E E l e c t r i f i cati o n M agaz ine / SEPTEMBER 2017 2325-5987/17©2017IEEE IMAGE LICENSED BY INGRAM PUBLISHING Battery-Powered Ships