A standing wave thermoacoustic piezoelectric apparatus capable of generating electrical energy from heat energy is provided. The standing wave thermoacoustic piezoelectric apparatus includes a housing, a porous stack and a piezoelectric bimorph. The housing comprises a compressible fluid and has a first portion and a second portion. The second portion receives the heat energy from a heat source for creating a temperature gradient between the first portion and the second portion. A cold heat exchanger within the first portion is positioned at one end of the porous stack. The compressible fluid traverses between the first portion and the second portion through the porous stack to generate standing acoustic waves for generating acoustic energy. The piezoelectric bimorph positioned at an end of the first portion opposite to an end of the first portion having the cold heat exchanger, oscillates based on the acoustic energy for generating the electrical energy.