Agreed. Something of that quality (literally something from nothingness, which as far as we can tell is not possible, and thankfully so!) means that you can fabricate ANYTHING that you want, from nothing, as long as you are willing to deal with the waste heat.
If that technology grew faster than the semiconductor cooling solutions I mentioned previously (which can convert heat into more useful forms of energy at low levels, but could be scaled up to deal with large amounts of entropic waste energy with nano-fabrication) say goodbye to the solar system as humans misuse the shit out of that technology. (See current problem with fossil fuels, humans asserting that it would take X hundreds of years "at current use statistics" for the apocalypse to happen, followed by a long period of complacency, economic beholden-ness to not properly eliminating entropic waste, and BOOM--- Glowing solar system before you know it.)
In the short term, due to the immediate dangers of the devices being mishandled by ignorant lay people (feedback loop == BOOOM), expect world governments to initiate a global crackdown, impose stiff regulations against construction of the devices, and even harsher penalties for unauthorized construction. By the same token, expect world governments to give out lucrative exclusivity contracts to the established power infrastructure to create and deploy the devices, which they will do-- but they wont reduce the utility costs. Instead, they will use artificial scarcity produced via the world government's actions to prevent weaponization of the technology to maintain artificial pricing-- See the Debiers Diamonds model, and that of most other natural monopolies.
It's possible that this breakthrough would permit world governments to finally have a "tractible" solution to the looming problems with rising CO2 levels, since the abundant energy would allow catalytic removal and processing of CO2 back into elemental carbon and oxygen gas at industrial scales not previously viable, enabling "Government Jobs" (at atmospheric reprocessing centers, who get kickbacks for their major carbon credits they accumulate.) since fossil fuels will still have a major niche in automotive, since the free energy technology would be tightly controlled, and thus not allowed on roadways due to "public safety."