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Waste heat from industry or urban facilities represents a largely underused and long disregarded energy source, while heating and cooling count for half the final energy demand in Europe. From the early 2010s onwards, waste heat recovery (WHR) is being recognized as a key challenge for energy transition and tends to be integrated into energy strategies at different levels. This paper provides an analysis of how WHR became a matter of public policy in Europe and in France. Based on a literature review, the analysis shows that WHR has been framed as a techno-economic problem, while some barriers (legal, organizational) to its development remain largely unaddressed. A study of European and French energy agendas illustrates how WHR progressively started to be recognized as an energy resource next to renewables. As a result, questions are raised as to further social science contributions to an extended research agenda addressing WHR. [ABSTRACT FROM AUTHOR]