Systematic investigation of impact of electronic structure and magnetism, on the thermoelectric properties of new Zr(2)NiZ (Z = Al, Ga) Heusler alloys are determined using density functional theory calculations. Half-metallicity with ferromagnetic character is supported by their 100% spin polarisations at the Fermi level. Magnetic moment of similar to 3 mu(B) is according to the Slater -Puling rule, enables their practical applications. Electron density plots are used to analyse the nature of bonding and chemical composition. Boltzmann's theory is conveniently employed to investigate the thermoelectric properties of these compounds. The analysis of the thermal transport properties specifies the Seebeck coefficient as 25.6 mu V/ K and 18.6 mu V/K at room temperature for Zr2NiAl and Zr2NiGa, respectively. The half -metallic nature with efficient thermoelectric coefficients suggests the likelihood of these materials to have application in designing spintronic devices and imminent thermoelectric materials.(C) 2017 Elsevier B.V. All rights reserved.