What are the 3 main sources of energy used in electrical power plants?

The three main sources of energy used in electrical power plants are fossil fuels, nuclear energy, and renewable sources. Fossil fuels, such as coal, natural gas, and oil, are burned to generate steam that drives turbines. Nuclear power plants use uranium to produce heat through nuclear fission, generating steam for electricity production. Renewable sources include hydroelectric, solar, and wind energy, which harness natural processes to generate electricity without depleting resources.