The biggest example is the sun. The sun is a HUGE ball of plasma. The light bulb contains a plasma when turned on. The electric arc used in arc welding is a plasma. The electrons and ions being charged are plasma and can carry an electric current which in turn provides enough energy to keep the gas ionized.
Lightning bolts are mostly plasma as the electric discharge ionizes the air.
A final example is the inside of a fusion reactor where physicists try create a plasma of a similar consistency to the inside of the sun in an attempt to generate energy using nuclear fusion, the sun's energy source.