Energy Storage Cluster
The Energy Storage Cluster is an upgraded form of the Energy Storage Module. It holds a lot more energy and it can output energy at higher power (more energy per tick), which is useful if you have a demanding energy network.
It outputs Tier 2 energy, and is therefore an important component of a Tier 2 energy system in Galacticraft 3.
It can also fast-charge electrical items placed in its charging slot, for your convenience.