A method and device for thermally remediating contaminant impacted media whereby heat and electricity are cogenerated by an integrated fuel combustor and semiconductor thermoelectric generation devices and applied as multiform energy to an individual, or multiple connected heating assemblies to generate and thermally conduct heat to contaminant impacted media. A hybrid energy thermal remediation system employs semiconductor thermoelectric generation devices to transform temperature differences created in the hybrid energy thermal remediation system by fuel combustion into electrical energy being reapplied as electricity to electrically resistive heating unit(s) to power auxiliary equipment and devices associated with the hybrid energy thermal remediation system, or to generate additional fuel through electrolysis. The hybrid energy thermal remediation system includes an energy co-generation assembly with integrated fuel combustor and semiconductor thermoelectric generating device(s) and heating assembly with a thermally conductive outer conduit in contact with the contaminant impacted media.