First, there is still no independently verifiable evidence the Rossi ECAT (Energy Catalyzer) actually generates power from the chemical catalytic based and low energy nuclear fusion (LENR-CANR) of Hydrogen and Nickel to produce Copper. Second, even if such a low energy chemical catalytic nuclear fusion reaction did take place, it would still be the low energy and chemical reaction that defines at as A LENR-CANR reaction. Such a low energy reaction is a miniscule fraction of what a high energy reaction obtains from the fusion of Deuterium to produce Helium.
LENR-CANR is attractive if and when it could ever be proven to overcome the Coulomb barrier and produce useful energy at such low costs with safety at low temperatures.
Likewise, if anyone can ever find a low cost means of developing and operating inexpensive true cold fusion reactors (not low energy chemical catalytic reactors) capable of producing energy and Helium from Deuterium, such an invention would be revolutionary in scope of deliverable energy and low cost.