In this informative video, we'll explain how microgrids use a feature called 'island mode' to keep critical systems running when the main power grid goes down. While these local sources usually synchronize with the grid, they must be able to separate under specific conditions. more How Do Microgrids Use 'island Mode' During Utility Failures? Have you ever wondered how some places stay powered during major utility failures? In this. I do have a three phase system with 3 multi plus 2 48v 5000. The second edition of the IET Code of Practice for Electrical Energy. Island BESS are commonly found in remote areas such as rural towns and mine sites, where access to the utility grid is limited. India's BESS: Ensuring Uninterrupted power.