This integrative evidence review examines renewable energy integration and cost efficiency in regional industry by asking how renewable energy integration is connected to cost 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 predictive analytics and maintenance planning, legacy-system compatibility, 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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