While the exact set of phenomena that unfold to release energy remains unclear, what was not debated at all was whether the potential to release heat was real. It clearly is, despite the extended difficulty scientists have had pinning down theory and practice. This issue seems entirely settled. Decades of work by hundreds of researchers reporting on their experiments and experiences of heat release “anomalies” have begun to provide a far more nuanced picture of the dynamics and the parametric guideposts that will eventually enable those studying them to narrow in on the controlling aspects. //

Given the potential value of this technology, it is no wonder that dozens of cash-strapped researchers and venture teams have soldiered on for decades. Now that ARPA-e has chosen to continue the work initiated by Google to identify a proof-of-concept design, there is new-found scientific integrity and rebranding to be done. There is also a greater awareness that what set cold fusion back and derailed early efforts was not scientific fraud but rather its far more complex sub-atomic transmutations, its multibody interactions combined with environmental factors such as temperature, pressure and light that varied by selection of component materials. These complexities still need to be sorted out but could potentially provide many viable options for sourcing and construction of systems and thus help to reduce manufacturing costs.