Ocean thermal energy conversion represents a promising opportunity for island communities seeking reliable, zero-carbon electricity generation. Unlike solar and wind resources that depend on weather conditions, open-cycle OTEC exploits the temperature difference between warm surface ocean water and cold deep water, providing steady baseload power. The dual benefit of simultaneous freshwater production addresses critical infrastructure needs on water-scarce islands.
Researchers have now developed a comprehensive optimization framework that integrates OTEC's thermodynamic characteristics directly into microgrid scheduling. The model uses a two-stage robust approach to account for renewable energy variability, recognizing that solar and wind output may deviate from forecasts. By employing an advanced algorithmic solution technique that accepts approximate intermediate solutions, the optimization process converges faster without sacrificing solution quality.
Numerical simulations reveal significant operational advantages. Open-cycle OTEC's controllable output allows grid operators to maintain stable frequency and voltage—challenges that intensify when relying solely on intermittent renewables. The technology can provide firm capacity comparable to conventional generators, eliminating the need for expensive backup diesel units that many island grids currently maintain. This reduces both operating costs and carbon emissions simultaneously.
The economic implications are substantial for island economies. Eliminated diesel imports represent major budget savings, while stable electricity costs improve industrial competitiveness. Freshwater co-generation reduces dependence on energy-intensive desalination or expensive water imports.
Despite these advantages, practical deployment faces engineering and environmental hurdles. OTEC systems require substantial capital investment and specialized infrastructure for deep-water intake pipes. Environmental impacts on marine ecosystems require careful site selection and monitoring. Nevertheless, the research demonstrates that OTEC deserves consideration in island energy planning, particularly for communities with suitable thermal gradients and limited renewable alternatives.
