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The present study deals with undoped and CuO:Ho2O3 doped Ba(Zr0.05Ti0.95)O3 perovskite compounds that were synthesized by the solid-state reaction method. The Rietveld refinement of the XRD data established the formation of a tetragonal phase having space group P4mm. A reduction in grain size and density with increasing Ho2O3 and CuO concentrations has been observed. An increase in the value of static dielectric constant and a considerable decrease in dielectric loss was observed in CuO:Ho2O3 doped Ba(Zr0.05Ti0.95)O3 ceramics. The room temperature value of energy storage density ( ξ = 93.30 mJ cm− 3) was measured in modified BZT ceramic corresponding to CuO:Ho2O3 composition, which may find an important application of this material in energy storage devices.