The Nirmala energy is a new metric for determining the thermal stability of a compound，and its energy is the sum of the absolute values of the eigenvalues of the Nirmala matrix. In this paper，the Nirmala energies of generalized splitting and shadow graphs on the basis of regular graphs are studied and the relationship between the Nirmala energies of the new graphs and those of the original graphs is obtained. The Nirmala energies of splitting and shadow graphs under the complete graphs and complete bipartite graphs are given.