The ordinary energy of the graph is defined as the sum of the absolute values of the eigenvalues of its adjacency matrix. In recent times analogous “energies” are being considered, based on the eigenvalues of a variety of other graph matrices. We briefly survey and comment this “energy deluge”, and then show that some of the results obtained (one-byone) for different graph energies, are special cases of a single general result, that is independent of any graph–theoretical interpretation.