Carbon nanotubes are promising candidates for thermoelectric power generation because of their one dimensionality mediated high Seebeck coefficient,  high  electrical  conductivity  with  added  advantages  of  flexibility,  light  weight,  and  scalability.  We  report  the  temperature dependent  thermoelectric  properties  of  single walled  carbon  nanotube  (SWCNTs)  films.  The  SWCNTs  films  exhibit  p-type  metallic conduction with high Seebeck coefficient (~69.5 µVK^-1) and moderate electrical conductivity (~76 Scm^-1). The films exhibit low thermal conductivity (~0.1 Wm^-1 K^-1) due to phonon scattering at the interjunction region. The synergetic combination of thermoelectric properties resulted in a high figure-of-merit of ~0.11 at 305 K. A flexible thermoelectric generator based on SWCNTs films mounted on a curved hot surface exhibited an output of 17 mV and 54 µA under a small temperature gradient of 10 K. The present work provides possible avenues for developing wearable SWCNTs based thermoelectric power generation modules for harvesting body heat.