Use solar panels to convert sunlight into electricity
Use wind turbines to convert wind energy into electricity
Use hydroelectric generators to convert moving water into electricity
Use steam turbines powered by burning fuel, geothermal heat, or nuclear heat to generate electricity
Use hand-crank generators to produce electricity mechanically
Use bicycle generators to produce electricity from pedaling
Use batteries to store and supply electricity
Use fuel cells to generate electricity from chemical reactions
Use thermoelectric generators to convert heat differences into electricity
Use piezoelectric materials to generate electricity from pressure or vibration