I made this Renewable Energy Lesson Plan based on a Breaking News English article and have used it quite successfully for 3 classes so far. The first page (A-D) is perfect for about a 1.5 hour, reasonably high-level class. You can use the second page (E-H) for a longer class of 2-4 hours.
And here's the Renewable Energy PPT, which I used for a 3 hour class. I used the MP3 file on Breaking News English that goes along with the article for a listening exercise and then we did some reading/discussion/speaking.
Korean students generally don't think that much about environmental issues such as green energy, but I think it's actually quite an important thing to be aware of. And even though I'm "just" an English teacher, I think I still have the potential to change lives and thinking for the better. Go green!