Upgrade Your Electricity Supply
Single-phase vs. Three-phase Supply
A single-phase meter measures usage from a 230 volt supply through two (2) wires, while a 3-phase meter measures usage from a 415 volt supply through four (4) wires.
You are advised to change from a single-phase supply to a 3-phase supply when your household electricity load exceeds 10kW or 50A. Generally, you should change to a 3-phase supply if you have three (3) or more air-conditioners in your home.
Upgrading to a 3-phase supply will increase stability and reliability of electricity supply to your premises.
Fees and Charges
Connection charges are based on your additional load. Please inquire at the nearest Customer Service Centre for more information on the connection charges imposed.
Where to apply for Upgrade/Downgrade?
1) Application On-Line
- Customer may apply for upgrading/downgrading by filling in the e-form via myTNB Self Service Portal.
2) Application at TNB Kedai Tenaga nearest to your premise
- You may submit your application to upgrade to 3-phase supply via a qualified electrical contractor registered with the Energy Commission.