 Transmission voltages are at 500 kV, 275 kV and 132 kV while distribution voltages are 33 kV, 22 kV, 11 kV and 415 V three-phase or 240 V single-phase.System frequency is 50 Hz 1%.Under its Total Energy Solution, Tenaga Nasional also offers electricity packaged with steam and chilled water for the benefit of certain industries that require multiple forms of energy for their activities.