The new emerging fields of MEMS-based energy harvesting from piezoelectric materials, lead to the development of solid-state electrostatic energy storage for better power/energy distribution for renewable energy and the solid-state electrocaloric cooling for low energy and hazard free refrigeration. Among them it is being reported that on application of 8.693 TPas-1 oscillated stress generates 10 Vs-1 oscillated voltage in 300 nm 0.75PMN-0.15PT thin films where 22 Jcc-1 s-1 of oscillated energy density can be harvested on application of 15 TPas-1 oscillated pressure upon 500 nm thin film of same material. It is also described that La modified antiferroelectric PbZrO3 (PZ) thin films are the potential materials that can achieve the high energy density storage density in the order of 103 J/kg. Though PZT-based antiferroelectric cooling triggered the research on the materials for electrocaloric cooling by the amount of 12 K adiabatic decrease in temperature on withdrawal of electric field, the decrease in temperature by 11.4 K in pure PZ and by 31 K in 0.63PMN-0.37PT thin film are found commendable. © 2014 Springer India.