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Optimizing energy futures in the Maldives: A study of Ocean Thermal Energy Conversion technology energy Mixes

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  • Saadha, Aminath
  • Ishihara, Keiichi N.
  • Ogawa, Takaya
  • Okumura, Hideyuki

Abstract

Ocean Thermal Energy Conversion (OTEC) offers a stable baseload renewable energy source for Small Island Developing States (SIDS), reducing reliance on fossil fuels by harnessing the ocean's temperature gradient. Despite its potential, OTEC remains underdeveloped due to high capital costs and limited integration into SIDS-specific energy models. This study evaluates OTEC's feasibility, developing energy mix scenarios that incorporate OTEC, solar PV, waste-to-energy, and battery storage. Using a high-resolution bottom-up energy system model, it explores transition pathways (2025–2055), assessing OTEC's role in achieving a 100 % renewable system. Findings validate OTEC's technical and economic viability in the Maldives, achieving a low Levelized Cost of Electricity (LCOE) of 0.15 USD/kWh in fully renewable scenarios, where it provides reliable baseload power. The OTEC60 scenario, with 57 % renewable energy penetration, maintains the same low LCOE while minimizing capital costs. Sensitivity analysis identifies fuel prices and OTEC capital costs as key factors, highlighting the need for cost reductions. Carbon pricing disincentivizes fossil fuel use, making full renewable adoption more viable over time. These results position OTEC as a resilient energy solution for high-demand islands, providing policymakers with actionable insights for sustainable energy transitions in SIDS.

Suggested Citation

  • Saadha, Aminath & Ishihara, Keiichi N. & Ogawa, Takaya & Okumura, Hideyuki, 2026. "Optimizing energy futures in the Maldives: A study of Ocean Thermal Energy Conversion technology energy Mixes," Renewable Energy, Elsevier, vol. 256(PD).
    • Handle: RePEc:eee:renene:v:256:y:2026:i:pd:s0960148125018683
    DOI: 10.1016/j.renene.2025.124204
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    References listed on IDEAS

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    1. Langer, Jannis & Quist, Jaco & Blok, Kornelis, 2020. "Recent progress in the economics of ocean thermal energy conversion: Critical review and research agenda," Renewable and Sustainable Energy Reviews, Elsevier, vol. 130(C).
    2. Drouineau, Mathilde & Assoumou, Edi & Mazauric, Vincent & Maïzi, Nadia, 2015. "Increasing shares of intermittent sources in Reunion Island: Impacts on the future reliability of power supply," Renewable and Sustainable Energy Reviews, Elsevier, vol. 46(C), pages 120-128.
    3. Langer, Jannis & Infante Ferreira, Carlos & Quist, Jaco, 2022. "Is bigger always better? Designing economically feasible ocean thermal energy conversion systems using spatiotemporal resource data," Applied Energy, Elsevier, vol. 309(C).
    4. Keiner, Dominik & Salcedo-Puerto, Orlando & Immonen, Ekaterina & van Sark, Wilfried G.J.H.M. & Nizam, Yoosuf & Shadiya, Fathmath & Duval, Justine & Delahaye, Timur & Gulagi, Ashish & Breyer, Christian, 2022. "Powering an island energy system by offshore floating technologies towards 100% renewables: A case for the Maldives," Applied Energy, Elsevier, vol. 308(C).
    5. Liu, Jiahong & Mei, Chao & Wang, Hao & Shao, Weiwei & Xiang, Chenyao, 2018. "Powering an island system by renewable energy—A feasibility analysis in the Maldives," Applied Energy, Elsevier, vol. 227(C), pages 18-27.
    6. Duic, Neven & Krajacic, Goran & da Graça Carvalho, Maria, 2008. "RenewIslands methodology for sustainable energy and resource planning for islands," Renewable and Sustainable Energy Reviews, Elsevier, vol. 12(4), pages 1032-1062, May.
    7. Prina, Matteo Giacomo & Groppi, Daniele & Nastasi, Benedetto & Garcia, Davide Astiaso, 2021. "Bottom-up energy system models applied to sustainable islands," Renewable and Sustainable Energy Reviews, Elsevier, vol. 152(C).
    8. van Alphen, Klaas & Hekkert, Marko P. & van Sark, Wilfried G.J.H.M., 2008. "Renewable energy technologies in the Maldives--Realizing the potential," Renewable and Sustainable Energy Reviews, Elsevier, vol. 12(1), pages 162-180, January.
    9. Sinha, Sunanda & Chandel, S.S., 2014. "Review of software tools for hybrid renewable energy systems," Renewable and Sustainable Energy Reviews, Elsevier, vol. 32(C), pages 192-205.
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