This resource provides an introduction to electricity and power plants. You can read the information on the page and also click on several links to get more information on power plants, the power grid, voltage, measuring electricity, kilowatt hours, ways to use electricity, and electrical demand. Of particular interest is How Plants Work, where you can explore hydro power, nuclear power, and gas & coal power. You should scroll over the animations to read the descriptions of the systems involved in creating electricity at the different power plants.
This resource could focus student attention on the fact that electricity is a secondary form of energy that is generated at a power plant. To introduce the resource, engage students in a discussion about the different energy sources and ask them to talk about how they think these power sources are converted to energy that we can use. Try to elicit what students already know and might think about energy and how it can be converted into electricity.