Summary: Discover how advanced battery energy storage systems are transforming the Cook Islands' transition to sustainable energy. This article explores innovative solutions, local case studies, and actionable strategies for optimizing renewable integration through cutting-edge storage technology. . Increase renewable energy contribution on Aitutaki from 0% to 24%. The initial concept for Aitutaki was to install a small (300 kW) diesel generator, solar PV (750 kW) control system. The purpose of the small diesel generator was to provide increased operational flexibility in scheduling of. . With battery storage, these projects supply 95 - 100% of electricity from renewable sources. Installation of solar PV is currently being Aitutaki has a population of approximately 1,800, and remaining islands are sparsely populated. The three Battery Energy Storage Systems (BESS) are located at Te Aponga. . Lithium-ion batteries dominate 89% of installed energy storage capacity in the Cook Islands due to: While lithium-ion leads today, the Cook Islands National Renewable Energy Laboratory is testing: EK SOLAR's hybrid system in the Northern Group islands demonstrates: "It's like having a solar farm. .