So, isn't the point of storage to get new energy?
The point of moving energy or stimulating the storage center is to up(increase) the capacity for storage, to make the storage center more capable of storing energy. It's sort of like in the body, you have x amount of fat cells, and if you eat too much the fat cells get bigger. What energy body storage work does is up the capacity for the 'fat cell' to store more fat, so when you need it you can burn it.
It's a gross analogy but it describes it well.
if so, where does this new energy come from,
That's been answered already- from everywhere. We're swimming in a sea of energy and some of it flows in our bodies, the thing is to get it channeled into our bodies and into doing what we want it to do.
if the technique we use is simply moving awareness up the legs and into the subnavel storage center?
That's one tech. The full body circuit moves it up the legs, up the back, up to your head, down your face, and into your subnavel storage center. As you visualize and stimulate the energy to go into the subnavel center (lower dantien) you increase the capacity for storage, (i.e. make the bucket bigger, lol).
All this does is supposed to stimulate the energy circuits right?
No, it's supposed to do that and to do what I said above.
So where does the energy come from? Do we imagine it, and it comes from there?
We don't imagine it. We feel it. As we feel it, our awareness goes to the spot, and energy is activated. The energy was there already but you were not aware of it. Now you are. As you focus your awareness on it, and move it, you get feedback (your nerves respond to the energy movement) and you know it's working.