What are the three basic sources of generating power?

The three basic sources of generating power are thermal, hydro-electric, and nuclear power. The thermal power uses heat energy as its base for the production of electricity. Hydro-electric power involves production of electricity through the use of kineticforce of falling water. And the nuclear power involves the use of sustained nuclear fission to generate electricity. 

The thermal sources, hydro-electric sources and nuclear power accounts for 70%, 28% and 2% of the power generation capacity respectively in India.