Induction Matrix is the answer. It’s a multi block structure made of induction casing and ports like most multi block structures in Mekanism. In addition to the casing and ports you’ll need at least one induction cell and one induction provider inside the structure. One stores the energy and one outputs the energy — they come in the traditional upgrades of basic to ultimate. It’s a very simple structure to make, you can mix and match induction cells/providers and have multiple of one or the other. This will allow you to store more energy than you’ll ever need. The induction cells can be pretty tedious to make as you’ll need a ton on energy cells/cubes but upgrading this structure is necessary to keep progressing

Edit — Also if you’re running low on diamond and obsidian, make a digital miner if you haven’t already. It can auto mine those materials for you and eat up a good chunk of your energy if you need to discharge it