Depletion of fossil fuels and environmental concerns compel changeover of energy production technologies from nonrenewable to renewable resources. Efficiency of Thermoelectric generator (TEG) is studied with different temperature gradient using alumina (Al2O3) base material as an alternative renewable energy production technology. In this research output voltage, Current and power produced is studied with 14 to 30 oC temperature gradient using Alumina base thermoelectric generator. When applied temperature gradient increased from 25 oC, there was a linear increase in output voltage against applied temperature gradient. Average increase of 0.1 Volt per oC was observed satisfying see back equation. Current produced shows same linear increase with ∆T with only exception from ∆T 14 to 15 oC. Maximum power was obtained when TEG was optimized at 0.38 A and 2.04 V at a load of 5.5 Ohm. When compared with photovoltaic cell alumina based TEG can gives benefit of 313.4 watts per m2 if resistance is optimized. Small scale TEG are more efficient that large scale TEG. TEG can be used effectively for production of auxiliary energy requirements at plants between hot fluid (steam) lines and cold fluid lines.