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The Pacific Islands Renewable Energy Investment Program, funded with USD 17 million in GCF grants, aims to transition seven Pacific SIDS—the Cook Islands, Marshall Islands, Micronesia, Nauru, Papua New Guinea, Samoa, and Tonga—away from diesel power. Component 1 focused on installing Battery Energy Storage Systems (BESS) in the Cook Islands to improve grid stability and load shifting, while Component 2 provided technical assistance for sector reform and capacity building across all target countries. The evaluation finds that while BESS installation has progressed, the lack of timely procurement for solar independent power producers (IPPs) has left some storage capacity idle. Component 2's effectiveness was significantly hampered by COVID-19 travel restrictions, though progress was made in the Marshall Islands and Micronesia. The report highlights the need to synchronize BESS and solar procurement and suggests a 'portfolio approach' to regional utility reform to diversify risk.