What is LT and HT supply?
LT (low tension) supply is at low voltage for homes and small users; HT (high tension) is above 650 volts. Also called low tension, high tension, LV, HV, low voltage, high voltage.
- Plain English
- Official sources
- Bill terms A–Z
LT and HT supply on your bill
Homes, shops and small industries get LT supply. Large users get HT supply from a dedicated transformer.
LT means up to 250 V between phase and neutral, or 440 V between phases. HT means above 650 V up to 33 kV.
LT and HT have different tariff schedules. The bill shows the category, such as 'LT I(B)' or 'HT'.
HT tariffs usually have demand charges and kVAh billing.
Check that your bill uses the correct LT or HT category.
Related terms
Official sources
- UPERC Electricity Supply Code, 2005, Notification UPERC/Secy.-Supply Code/05-4528, 18-02-2005 (copy hosted by PVVNL), cl. 2.2(kk) 'Low Tension'
“a voltage that does not exceed 250 volts between phase and neutral or 440 volts between any two phases” - UPERC Electricity Supply Code, 2005, Notification UPERC/Secy.-Supply Code/05-4528, 18-02-2005 (copy hosted by PVVNL), cl. 2.2(ee) 'High Tension'
“a voltage level above 650 volts and upto 33000 Volts under normal conditions” - TNERC Tamil Nadu Electricity Supply Code (consolidated text), reg. 2(l)
“a consumer who obtains supply from the Licensee at Low or Medium Voltage”
Read on 17 October 2026. Your State regulator’s rules and your discom’s bill have the final word.