This report presents the 2024 integrated resource plan (IRP) of the Imperial Irrigation District (IID), a publicly owned utility (POU) in south-eastern California and the sixth-largest by peak load (1,152 MW in 2023). As of December 2023, IID serves 163,579 customers across the residential, commercial, and industrial categories. The IRP describes how IID plans to meet its energy and capacity resource needs, policy goals, comply with clean energy policy goals, and balance the physical and operational constraints in its role as Balancing Authority, all while continuing to provide safe, reliable, and affordable power to its customers. The period of study in this IRP runs from 2024 through 2045 which is an extension of the 2030 planning horizon in the previous IRP iteration. The IRP incorporates the latest legal requirements, such as the 100% zero-carbon electricity by 2045 target established by Senate Bill 100, as well as the changes in IID’s resource portfolio, such as the pending retirement of fossil generation at Yucca. The IRP development process is a significant undertaking that requires input from a diversity of departments, including the Transmission, Distribution, Operations, Finance, and Special Programs groups. This report is the five-year update to the 2019 Integrated Resource Plan (IRP), pursuant to Public Utilities Code (PUC) Section 9622 as codified by the Clean Energy and Pollution Reduction Act of 2015 (SB 350).