The math
How TNB bills a medium-voltage site, and how we price a saving
Last updated . Rates effective .
What is on a medium-voltage bill
- Energy charge. Sen per kWh used. On Time-of-Use it differs by hour: peak runs 2pm–10pm on weekdays.
- Capacity charge. RM per kW of maximum demand in the cycle.
- Network charge. RM per kW of maximum demand, billed alongside capacity.
- Retail charge. A fixed RM200 per month.
- Power factor surcharge. Applies when power factor falls below 0.85 at or below 33kV, or 0.9 at 132kV and above.
MV General vs MV Time-of-Use
| MV General | MV Time-of-Use | |
|---|---|---|
| Energy, peak | 29.83 sen/kWh | 31.32 sen/kWh |
| Energy, off-peak | 29.83 sen/kWh | 27.23 sen/kWh |
| Capacity | RM29.43/kW | RM30.19/kW |
| Network | RM59.84/kW | RM66.87/kW |
| Demand total | RM89.27/kW | RM97.06/kW |
| Retail | RM200/month | RM200/month |
Time-of-Use energy beats General only if enough kWh falls off-peak. Break-even is about 36.4% of energy at off-peak before demand charges. Source: TNB tariff schedule.
Unlisted operating-hour/tariff combinations assume no tariff-fit benefit. Unknown hours or tariff use the “Not sure” range. All calculator percentages are unverified pilot placeholders.
Worked example
A cold store with 50 kW of avoidable peak demand saves about RM58,000 a year.
50 kW × (RM30.19 + RM66.87) × 12 months
= 50 × RM97.06 × 12 = RM58,236
The 50 kW is an illustrative assumption, not a measured saving. Demand rates are the Time-of-Use figures above.
How the 25% fee works
Our fee is 25% of verified savings for 12 months. Savings are measured like this:
Tariff difference = your actual bill re-priced on the old tariff minus your actual bill, on the same meter data, for each 30-day cycle, for 12 months.
No saving, no fee. Demand-side findings are verified the same way on your meter data. Illustrative placeholder ranges in the calculator are to be verified after the pilot and are not client results.