Nico Nico Nii!~
The Boundaries Crossed set doesn't actually have any energy in the packs. Right now, until the Plasma Storm set comes out next month, the only way to get high quantities of energy is to buy a theme deck with the energy type(s) you want for a deck, or to buy them in lots off of eBay or Amazon. For Basic Energy (any energy without an effect), it can be from any set and still be tournament legal. They're usually pretty cheap.