To be realistic . although one microgram of dense hydrogen represents about 30 kWhrs of thermal energy based on the net decay energy of the nucleon disintegration, it is clear from both theory and Holmlid's results - that most of that energy is lost to neutrinos.
In fact the usable energy could be a few percent of net, maybe less than a percent. But even 1% is a 17 million times more than chemical And I agree with Bob about the waste heat problem with thermoelectrics as being a major impediment. That is a problem which will be as important to solve as LENR itself. For years, there have been claims of high efficiency TEG. All of them turn out to be BS, so far. Including. ta da . the most blatant false claim of all, which came from none other than Andrea Rossi. Google "Thermoelectric Scam of Andrea Rossi" . and hold your nose. Make of that what you will, wrt his current claims ..