A power generation system , comprising: a fuel-cell subsystem comprising a fuel-cell configured to generate an electrical power; a power electronics subsystem electrically coupled to the fuel-cell subsystem and configured to process at least a portion of the electrical power generated by the fuel-cell subsystem; a first conduit fluidly coupled to the power electronics subsystem and configured to supply at least a portion of a fuel stream to the power electronics subsystem, wherein the power electronics subsystem is configured to heat the portion of the fuel stream to form a pre-heated fuel stream ; and a second conduit fluidly coupled to the power electronics subsystem and the fuel-cell subsystem and configured to supply the pre-heated fuel stream to the fuel-cell subsystem, wherein the fuel-cell is configured to generate the electrical power using the pre-heated fuel stream, wherein the power electronics subsystem further comprises: a power processing unit comprising: a power module ; a thermally conductive medium disposed in thermal contact with the power module; a first cooling channel disposed in thermal contact with the thermally conductive medium, wherein the first cooling channel is fluidly coupled to: the first conduit to receive the portion of the fuel stream, and the second conduit to supply the pre-heated fuel stream to a second heat exchanger, wherein the pre-heated fuel stream is formed by heat transfer to the portion of the fuel stream from the thermally conductive medium via the first cooling channel, and wherein the power processing unit further comprises a second cooling channel disposed in thermal contact with the thermally conductive medium, wherein the second cooling channel is fluidly coupled to the fuel-cell subsystem and configured to receive water, and supply a pre-heated water stream to the fuel-cell subsystem, and wherein the pre-heated water stream is formed by heat transfer to water from the thermally conductive medium via the second cooling channel. a fuel-cell subsystem comprising a fuel-cell configured to generate an electrical power; a power electronics subsystem electrically coupled to the fuel-cell subsystem and configured to process at least a portion of the electrical power generated by the fuel-cell subsystem; a first conduit fluidly coupled to the power electronics subsystem and configured to supply at least a portion of a fuel stream to the power electronics subsystem, wherein the power electronics subsystem is configured to heat the portion of the fuel stream to form a pre-heated fuel stream ; and a second conduit fluidly coupled to the power electronics subsystem and the fuel-cell subsystem and configured to supply the pre-heated fuel stream to the fuel-cell subsystem, a power processing unit comprising: a power module ; a thermally conductive medium disposed in thermal contact with the power module; a power module ; a thermally conductive medium disposed in thermal contact with the power module; a first cooling channel disposed in thermal contact with the thermally conductive medium, wherein the first cooling channel is fluidly coupled to: the first conduit to receive the portion of the fuel stream, and the second conduit to supply the pre-heated fuel stream to a second heat exchanger, wherein the pre-heated fuel stream is formed by heat transfer to the portion of the fuel stream from the thermally conductive medium via the first cooling channel, and the first conduit to receive the portion of the fuel stream, and the second conduit to supply the pre-heated fuel stream to a second heat exchanger, wherein the pre-heated fuel stream is formed by heat transfer to the portion of the fuel stream from the thermally conductive medium via the first cooling channel, and <EOS>