Singapore built an artificial island 8 kilometers offshore that generates all its own electricity from four renewable sources simultaneously — tides, wind, solar, and waves — the world's first installation harvesting all four ocean energy types from a single location.
Sentosa Energy Island sits on a 4-hectare artificial platform in the Singapore Strait where the convergence of the Malacca and South China Sea creates exceptional multi-source energy conditions. Tidal turbines beneath the platform exploit the 2.4-meter daily tidal range in the strait, generating electricity during four tidal cycles per day. Wave energy converters around the platform perimeter harvest energy from strait surface chop. Wind turbines atop the platform capture consistent northeast and southwest monsoon winds. Bifacial solar panels on all horizontal surfaces generate electricity from direct tropical sun and reflected sea surface irradiance from both above and below each panel.
The four energy sources operate on different timescales and weather dependencies, providing natural portfolio complementarity — when one source is low, others compensate. The platform achieves 94 percent annual energy availability with zero fossil fuel backup required, supplying 45 megawatts continuously to the Singapore mainland through a single submarine cable. Singapore's grid operator reports Sentosa Energy Island provides the most consistent renewable generation on the national system.
The design proves that small island nations with no land for large energy installations can achieve energy independence by harvesting the ocean surrounding them from a single compact multi-source platform.
Source: Singapore Energy Market Authority, Keppel Infrastructure, Maritime Port Authority Singapore, 2025
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