A travelling wave thermoacoustic piezoelectric apparatus capable of generating electrical energy from heat energy is provided. The travelling wave thermoacoustic piezoelectric apparatus includes a hosing with two ends connected by an inertance component, a porous stack, a resonator, and a piezoelectric bimorph. The housing comprises a compressible fluid and has a first portion and a second portion. The first portion receives 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 second 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 and the inertance component to generate travelling acoustic waves. The travelling acoustic waves resonate with the resonator for generating acoustic energy. The piezoelectric bimorph positioned at an end of the resonator opposite to an end of the resonator connected to the second portion, oscillates based on the acoustic energy for generating the electrical energy.