TOEFL Listening

🎧 Listening Transcript

Listen to part of a lecture in an environmental science class. The professor is discussing renewable energy sources. Professor: Today we're going to talk about solar power, but not just the photovoltaic panels you see on rooftops. I want to focus on concentrated solar power, or CSP, which uses mirrors to focus sunlight onto a small area to generate heat. That heat can then be used to produce steam and drive a turbine, generating electricity. One advantage of CSP is that it can store thermal energy, for example, in molten salt, which allows electricity generation even after sunset. This is a key difference from conventional solar panels, which require direct sunlight to produce electricity. However, CSP has limitations. It requires a high amount of direct sunlight, so it's only practical in arid regions with clear skies, like deserts. Also, the initial construction cost is high, and it requires a lot of water for cooling, which can be problematic in those same desert areas. Nevertheless, research is ongoing to reduce water usage and improve efficiency. So, while CSP isn't a one-size-fits-all solution, it could play a significant role in regions that receive abundant sunshine.