TNB's July 2025 tariff (RP4) explained for businesses

What changed in TNB's July 2025 business tariff?

The published RP4 structure groups customers by supply voltage rather than relying only on the old commercial and industrial categories.

An old tariff code on an earlier bill is therefore not enough to decide what your site should pay now.

Start with the tariff name and supply voltage on a bill covering the new period, then check that mapping against TNB's official schedule.

This guide focuses on non-domestic medium-voltage General and Time-of-Use tariffs in Peninsular Malaysia.

It does not apply these rates to domestic accounts, low-voltage shops, high-voltage installations, or special agricultural and water-sector tariffs. Those categories have different published components.

Klang Valley, Johor and Penang sites still need their own account eligibility checked before comparing alternatives.

What are energy, capacity, network and retail charges?

Energy charges price electricity consumed, measured in kilowatt-hours. Capacity charges cover generation capacity, while network charges cover the infrastructure that delivers electricity.

Retail charges cover billing, account management and customer service.

For medium- and high-voltage accounts, the published capacity and network rates are expressed per kilowatt of maximum demand per month, not per kilowatt-hour.

That distinction matters operationally. Reducing annual consumption can lower energy charges without changing the half-hour that establishes monthly maximum demand.

Conversely, rearranging equipment operation may reduce a demand peak without using less electricity overall.

A useful bill review separates these effects instead of treating the whole invoice as a single blended sen-per-kWh price.

What are the published medium-voltage General rates?

For the non-domestic medium-voltage General tariff effective 1 July 2025, TNB publishes an energy charge of 29.83 sen/kWh, capacity charge of RM29.43/kW of monthly maximum

demand and network charge of RM59.84/kW of monthly maximum demand. The retail charge is RM200.00 per month.

These are base schedule rates, not an all-inclusive invoice total.

Adding the capacity and network components gives RM89.27 per kW of monthly maximum demand.

General pricing does not divide the base energy charge into peak and off-peak consumption.

However, it remains important to identify the actual monthly maximum demand from the meter record;

averaging monthly demand figures across a year would change the billing calculation.

How does medium-voltage Time-of-Use pricing work?

For the corresponding Time-of-Use tariff, published energy prices are 31.32 sen/kWh in peak periods and 27.23 sen/kWh off-peak.

Capacity is RM30.19 and network RM66.87 per kW of peak-period monthly maximum demand, giving RM97.06/kW/month combined. The retail charge remains RM200.00 per month.

The source is TNB's official tariff schedule.

The published peak window is 2pm–10pm Monday to Friday. Other weekday hours, weekends and the specified public holidays are off-peak.

Use TNB's applicable holiday calendar rather than assuming every local closure or regional working-week variation is automatically an off-peak day.

The energy calendar and the demand measurement window must both be applied consistently.

What is Automatic Fuel Adjustment, or AFA?

AFA adjusts the energy-related cost for changing fuel prices and foreign exchange rates.

TNB describes it as a monthly mechanism under RP4, replacing the earlier ICPT approach.

It may be a surcharge or rebate for the applicable customer category and period.

A historical bill should be reconciled using the adjustment applicable to that billing period, not today's rate.

The tariff schedule and monthly AFA notices serve different purposes. Base rates allow a consistent tariff comparison;

the appropriate AFA then helps reconcile each actual invoice.

Do not assume that a domestic exemption applies to an industrial account, and do not describe a forecast adjustment as a confirmed future bill rate.

Check the official monthly notice and your account category.

Why can my bill differ from a base-rate calculation?

A bill can also contain adjustments, an applicable renewable-energy fund charge, power-factor surcharges, credits, arrears or other account-specific items.

A formula that covers only energy and maximum demand will not necessarily reproduce the amount payable.

Separate current-period electricity charges from earlier balances, and preserve the original bill line descriptions when tracing an unexplained difference.

Partial billing periods, meter multipliers, estimated readings and tariff changes during a period also deserve attention.

Check dates and units before concluding that a charge is wrong.

For any tax, levy or exemption, use the relevant official rule for the account and period instead of copying a rate from another customer's bill

or a residential calculator.

How should a business review its tariff?

Collect a complete billing cycle across a representative year and the matching half-hourly meter export, where available.

Reconcile recorded consumption to each bill, identify the maximum-demand interval, and apply each eligible published tariff to the same consumption.

A seasonal site can look very different in its busiest month, so a single quiet-month screenshot is not a reliable annual comparison.

Rukan reviews your bills and available data. We identify tariff fit, maximum demand, power factor and billing accuracy separately, and label operational changes differently

from equipment investment. Bills alone are enough to begin; missing interval data can be requested later.

Every finding traces back to the records for your own account; no saving is assumed in advance.