https://www.youtube.com/watch?v=vkboynxTWR4
Yogendra Srivastava explains the latest version of the Widom-Larsen Theory. At 13:30, the energy coming from the environment of the nanoparticles is guided along the surface of the nanoparticles and form a resonance on their surface. This resonance is transferred and trapped in a conductor isolated but very near the nanoparticules. These elementary currents added to each other form the big current at the output of the device. W & L theory as been moving toward the nanoplasmonic theory of the LENR reaction for some time now. It looks like they are mostly there.