[2026] PTE Academic Writing - Summarize written text

Ocean thermal energy conversion (OTEC) is a renewable energy technology that generates electricity by exploiting the temperature difference between warm surface seawater and cold deep ocean water. By utilizing a heat engine to drive a generator, this process can provide a constant and predictable supply of baseload power, unlike wind and solar energy, which are subject to weather fluctuations. This technology is particularly well-suited for tropical coastal regions and island nations, offering them a path toward energy independence and the reduction of fossil fuel imports.

Despite its immense potential for clean power generation, OTEC faces significant technical and logistical barriers to large-scale commercialization. The primary obstacle is the high capital cost required to construct the massive offshore platforms and the long pipelines needed to pump cold water from depths of over 1,000 meters. Furthermore, the harsh marine environment, characterized by corrosive saltwater and the threat of severe storms, poses a constant challenge to the durability of the infrastructure. However, as researchers develop more efficient heat exchangers and modular designs, OTEC is increasingly viewed as a vital component of a resilient, carbon-free global energy portfolio.