This integrative evidence review examines smart energy monitoring and operational efficiency in industrial facilities by asking how smart energy monitoring is connected to operational efficiency and which conditions determine whether that connection becomes operationally meaningful. The article synthesizes peer-reviewed and institutional literature relevant to industrial assets, production systems, infrastructure, and built environments, emphasizing mechanisms, boundary conditions, and measurement choices rather than a universal average effect. The synthesis identifies complementary roles for lifecycle costing and asset prioritization, capital constraints, and governance or coordination routines. No survey, interview, experiment, proprietary dataset, or regression estimate is represented as having been collected for this conceptual review.
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