There does appear to be fair bit of research in LENRs going on right now, note this article claims its the fusion of hydrogen atoms producing the extra heat: h

There does appear to be fair bit of research in LENRs going on right now, note this article claims its the fusion of hydrogen atoms producing the extra heat: https://spectrum.ieee.org/energy/nuclear/scientists-in-the-us-and-japan-get-serious-about-lowenergy-nuclear-reactions https://spectrum.ieee.org/energy/nuclear/scientists-in-the-u...