I think the most utilized means of generating electricity is through the hydro medium. That is the generating of electricity from water. However, it has been proven with experiments that electricity can still be generated through some other medium.
Some of these underutilized means are through:
1. Wind: Electricity can be generated from wind with the help of a turbine. Turbines convert kinetic energy that is captured from the wind into electricity. The amount of electricity generated is directly proportional to the speed of the wind.
2. Coal: This is actually a quite popular means of generating electricity. A large population from several countries, especially in Asia and Africa, make use of this medium to generate electricity.
3. Solar: Solar thermal generates electricity making use of the heat provided from the sun. Solar photovoltaic makes use of semiconductors to convert sunlight to electricity, a direct current.