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IEA (2025), Payback period, savings and implementation of 55 000 individual energy efficiency measures grouped into major types of intervention in the United States, 2002-2024, IEA, Paris https://www.iea.org/data-and-statistics/charts/payback-period-savings-and-implementation-of-55-000-individual-energy-efficiency-measures-grouped-into-major-types-of-intervention-in-the-united-states-2002-2024, Licence: CC BY 4.0