I’m currently using the ice maker as my regular ice maker as my refrigeratorfreezer is too small to add ice trays. I’m hoping it energy efficient!  There’s no information estimating usage costs. The ice cubes are pretty small -even the large ones. But they are pretty dense and seem to not melt fast in your drink. The color is gorgeous!  Candy apple red. Looks pretty on the counter too. Overall I am loving the device!