Energy transfers involved in generating electricity

Wind

Kinetic energy (wind), turns propellers ---> electric energy, in the generator.

Water

Kinetic energy (waves), turns propellers ---> electric energy, in the generator.

Geothermal resources

Thermal energy (water underground) ---> kinetic energy, water in streams ---> electical energy, turbine.

Solar heating systems

Thermal energy (from sun) from water ---> kinetic energy (steam, evaporation of water), turns turbines ---> electrical energy, in the generator.

Solar cells

Thermal energy (from sun) ---> electrical energy, solar cells.

Fossil fuels

Thermal energy (from burning fossil fuels) ---> kinetic energy, fast moving stream ---> electrical energy, in the turbines.

Nuclear power

Thermal energy (nucleus split, nuclear fission) ---> kinetic energy, fast moving stream ---> electrical energy, in the turbines.