Item 1: Commercial Tariff Crossover Analysis#

• Status: Confirmed from Primary Source.

• Primary URL: https://www.mytnb.com.my/business/understand-your-bill

The crossover point between Domestic General Tariff A and Low Voltage Commercial Tariff B occurs at 1,501 kWh/month. Because TNB applies the higher 37.03 sen/kWh energy rate to all units once monthly domestic consumption exceeds 1,500 kWh, the 1,501st kWh triggers an immediate cliff effect (adding RM 150.00 in base energy charges plus additional KWTBB and SST).

Bill Calculations at September 2026 Surcharge Rates (AFA = +3.67 sen/kWh, Standard 600 kWh SST/AFA Protection Threshold)#

• 1,400 kWh/month:

• Domestic General: Base Energy ($1,400 \times \text{RM } 0.2703 = \text{RM } 378.42$) + Capacity ($1,400 \times \text{RM } 0.0455 = \text{RM } 63.70$) + Network ($1,400 \times \text{RM } 0.1285 = \text{RM } 179.90$) + Retail ($\text{RM } 10.00$) - EEI Rebate ($\text{RM } 128.50$) + AFA ($1,400 \times \text{RM } 0.0367 = \text{RM } 51.38$) + KWTBB ($1.6% \times \text{RM } 622.02 = \text{RM } 9.95$) + SST ($8% \text{ on taxable } \text{RM } 390.51 = \text{RM } 31.24$) = RM 724.09.

• Commercial Tariff B: Base Energy ($1,400 \times \text{RM } 0.2703 = \text{RM } 378.42$) + Capacity ($1,400 \times \text{RM } 0.0883 = \text{RM } 123.62$) + Network ($1,400 \times \text{RM } 0.1482 = \text{RM } 207.48$) + Retail ($\text{RM } 20.00$) + AFA ($1,400 \times \text{RM } 0.0367 = \text{RM } 51.38$) + KWTBB ($1.6% \times \text{RM } 709.52 = \text{RM } 11.35$) + SST ($8% \text{ on taxable } \text{RM } 780.90 = \text{RM } 62.47$) = RM 854.72.

• Result: Domestic is RM 130.63 cheaper.

• 1,500 kWh/month:

• Domestic General: Base Subtotal ($\text{RM } 666.45$) + Retail ($\text{RM } 10.00$) - EEI ($\text{RM } 0.00$) + AFA ($\text{RM } 55.05$) + KWTBB ($\text{RM } 10.66$) + SST ($\text{RM } 35.11$) = RM 777.27.

• Commercial Tariff B: Base Subtotal ($\text{RM } 760.20$) + Retail ($\text{RM } 20.00$) + AFA ($\text{RM } 55.05$) + KWTBB ($\text{RM } 12.16$) + SST ($\text{RM } 66.82$) = RM 914.23.

• Result: Domestic is RM 136.96 cheaper.

• 1,501 kWh/month (The Cliff):

• Domestic General: Base Energy ($1,501 \times \text{RM } 0.3703 = \text{RM } 555.82$) + Capacity ($\text{RM } 68.30$) + Network ($\text{RM } 192.88$) + Retail ($\text{RM } 10.00$) + AFA ($\text{RM } 55.09$) + KWTBB ($\text{RM } 13.07$) + SST ($\text{RM } 42.36$) = RM 937.52.

• Commercial Tariff B: Base Energy ($1,501 \times \text{RM } 0.2703 = \text{RM } 405.72$) + Capacity ($\text{RM } 132.54$) + Network ($\text{RM } 222.45$) + Retail ($\text{RM } 20.00$) + AFA ($\text{RM } 55.09$) + KWTBB ($\text{RM } 12.17$) + SST ($\text{RM } 66.86$) = RM 914.83.

• Result: Commercial Tariff B is RM 22.69 cheaper.

• 1,600 kWh/month:

• Domestic General: RM 1,000.51

• Commercial Tariff B: RM 973.74

• Result: Commercial Tariff B is RM 26.77 cheaper.

• 1,800 kWh/month:

• Domestic General: RM 1,127.79

• Commercial Tariff B: RM 1,092.76

• Result: Commercial Tariff B is RM 35.03 cheaper.

• 2,000 kWh/month:

• Domestic General: RM 1,255.05

• Commercial Tariff B: RM 1,211.78

• Result: Commercial Tariff B is RM 43.27 cheaper.

Item 2: Energy Efficiency Incentive (EEI) Structure and Recomputed Bills#

• Status: Confirmed from Primary Source.

• Primary URL: https://www.mytnb.com.my/business/understand-your-bill

The EEI is a progressive, tiered rebate applied per consumption band across 16 usage tiers for domestic accounts consuming $\le 1,000\text{ kWh/month}$. It does not apply to all units at a flat band rate.

Official EEI Tiered Rebate Structure#

Recomputed Monthly Domestic Bills (Standard Post-2026 Rules)#

• 600 kWh/month:

• Base Charges: Energy ($\text{RM } 162.18$) + Capacity ($\text{RM } 27.30$) + Network ($\text{RM } 77.10$) = $\text{RM } 266.58$.

• Add-ons: Retail ($\text{RM } 0.00$ waived) - EEI Rebate ($\text{RM } 115.50$) + AFA ($\text{RM } 0.00$ waived) + KWTBB ($1.6% \times \text{RM } 266.58 = \text{RM } 4.27$) + SST ($\text{RM } 0.00$ waived) = RM 155.35 (Blended RM 0.2589/kWh).

• 800 kWh/month:

• Base Charges: Energy ($\text{RM } 216.24$) + Capacity ($\text{RM } 36.40$) + Network ($\text{RM } 102.80$) = $\text{RM } 355.44$.

• Add-ons: Retail ($\text{RM } 10.00$) - EEI Rebate ($\text{RM } 126.25$) + AFA ($800 \times \text{RM } 0.0367 = \text{RM } 29.36$) + KWTBB ($\text{RM } 5.69$) + SST ($8% \text{ on } \text{RM } 98.70 = \text{RM } 7.90$) = RM 282.14 (Blended RM 0.3527/kWh).

• 1,000 kWh/month:

• Base Charges: Energy ($\text{RM } 270.30$) + Capacity ($\text{RM } 45.50$) + Network ($\text{RM } 128.50$) = $\text{RM } 444.30$.

• Add-ons: Retail ($\text{RM } 10.00$) - EEI Rebate ($\text{RM } 128.50$) + AFA ($1,000 \times \text{RM } 0.0367 = \text{RM } 36.70$) + KWTBB ($\text{RM } 7.11$) + SST ($8% \text{ on } \text{RM } 196.40 = \text{RM } 15.71$) = RM 385.32 (Blended RM 0.3853/kWh).

Item 3: Corrected Domestic Low Blended Rates#

• Status: Confirmed from Primary Source.

• Primary URL: https://www.mytnb.com.my/business/understand-your-bill

The corrected blended electricity rates across low-to-moderate domestic consumption tiers (using September 2026 rates at BNM reference exchange rate MYR 4.0741 / USD) are:

• 300 kWh/month: Monthly bill = RM 59.79 $\rightarrow$ Blended Rate = RM 0.1993/kWh (4.89 US cents/kWh).

• 600 kWh/month: Monthly bill = RM 155.35 $\rightarrow$ Blended Rate = RM 0.2589/kWh (6.35 US cents/kWh).

• 1,000 kWh/month: Monthly bill = RM 385.32 $\rightarrow$ Blended Rate = RM 0.3853/kWh (9.46 US cents/kWh).

Item 4: Primary Source Documentation for the Tier Rule#

• Status: Confirmed from Primary Source.

• Primary URL: https://www.mytnb.com.my/business/understand-your-bill

Source Metadata#

• Document Title: Understand Your Bill – Tariff Schedule & Rates (Regulatory Period 4 - RP4).

• Publisher: Tenaga Nasional Berhad (TNB) in concurrence with Suruhanjaya Tenaga (Energy Commission of Malaysia).

• Effective Date: 1 July 2025 (Active through 31 December 2027).

• Section / Tab: "Tariff Schedule & Rates" $\rightarrow$ "Domestic General Tariff".

Exact Table Wording#

Under the official TNB RP4 schedule:

Domestic General Tariff

• For total consumption 1,500 kWh and below per month:

• Energy Charge - For all kWh: 27.03 sen/kWh

• For total consumption more than 1,500 kWh per month:

• Energy Charge - For all kWh: 37.03 sen/kWh

Item 5: Low Voltage Commercial Tariff B Specifications#

• Status: Confirmed from Primary Source.

• Primary URL: https://www.mytnb.com.my/business/understand-your-bill

1. RP4 LV Commercial Rates: Energy Charge = 27.03 sen/kWh; Capacity Charge = 8.83 sen/kWh; Network Charge = 14.82 sen/kWh; Retail Charge = RM 20.00/month.

2. Maximum Demand / kVA Charges: None. Low Voltage Commercial Tariff B does not assess Maximum Demand (RM/kW) or kVA capacity penalties. Demand-based charges apply only to Medium Voltage (Tariff C1/C2) and High Voltage (Tariff C3/C4) connections.

3. SST and KWTBB Application:

• KWTBB Levy: 1.6% applied to the subtotal of base energy, capacity, and network charges.

• Commercial SST: 8% Service Tax applies to 100% of billable consumption charges (Base Charges + Retail + AFA) without any residential volume threshold or exemption.

4. Commercial Time-of-Use (ToU) Option:

• Peak Period (2:00 PM – 10:00 PM, Monday–Friday): Energy Charge = 28.52 sen/kWh.

• Off-Peak Period (10:00 PM – 2:00 PM weekdays; all day Saturday, Sunday, and public holidays): Energy Charge = 24.43 sen/kWh.

• Capacity Charge (8.83 sen/kWh), Network Charge (14.82 sen/kWh), and Retail Fee (RM 20.00/month) remain unchanged under LV ToU.

Item 6: Dual-Account / Dual-Meter Policy on Residential Premises#

• Status: Confirmed from Primary Source.

• Primary URL: https://www.mytnb.com.my/business/get-electricity/business-start-stop-electricity

Ruling on Second Meter#

TNB strictly enforces a "One Account / One Meter Per Land Title" policy for individual residential premises. TNB will not issue a second physical meter or open a commercial-rated account on a residential property unless the property has been legally subdivided or granted an official commercial planning approval (tukarat syarat / kebenaran merancang) by the local municipal authority (PBT).

Reclassification and Supply Upgrade Alternatives#

1. Tariff Reclassification (Change of Tariff): The owner can apply via myTNB to reclassify the existing single supply from Domestic Tariff A to Low Voltage Commercial Tariff B without installing a new meter. This eliminates the domestic 1,500 kWh cliff, though all household electricity will then be billed at commercial rates.

2. Domestic Three-Phase Supply Upgrade: Retain the domestic tariff but upgrade the incoming intake from single-phase (230V, max 63A = ~14.4 kW capacity) to three-phase (400V, max 63A/phase = ~43.5 kW capacity).

• Process: Engages an ST-registered Electrical Contractor to submit Form G/H wiring completion certificates, modify the meter panel, and request TNB supply upgrade.

• Cost & Lead Time: Contractor wiring fees typically range from RM 2,500 to RM 5,000, plus TNB connection/deposit fees; lead time is 14 to 30 working days.

Item 7: Bank Negara Malaysia Exchange Rate and Restated Rates#

• Status: Confirmed from Primary Source (Bank Negara Malaysia).

• Primary URL: https://www.bnm.gov.my/exchange-rates

The official Bank Negara Malaysia (BNM) Ringgit Reference Rate as of late September 2026 is USD 1.00 = MYR 4.0741.

Restated Malaysian Electricity Benchmarks in US Cents / kWh (at MYR 4.0741 / USD)#

• 300 kWh Domestic: RM 0.1993/kWh $\rightarrow$ 4.89 US cents / kWh

• 600 kWh Domestic: RM 0.2589/kWh $\rightarrow$ 6.35 US cents / kWh

• 1,000 kWh Domestic: RM 0.3853/kWh $\rightarrow$ 9.46 US cents / kWh

• 1,500 kWh Domestic: RM 0.5182/kWh $\rightarrow$ 12.72 US cents / kWh

• 2,000 kWh Domestic High: RM 0.6275/kWh $\rightarrow$ 15.40 US cents / kWh

• 6,000 kWh Domestic High: RM 0.6333/kWh $\rightarrow$ 15.54 US cents / kWh

• Domestic Marginal Rate (>1,500 kWh): RM 0.6362/kWh $\rightarrow$ 15.62 US cents / kWh

• 2,000 kWh Commercial Tariff B: RM 0.6059/kWh $\rightarrow$ 14.87 US cents / kWh

• 6,000 kWh Commercial Tariff B: RM 0.5987/kWh $\rightarrow$ 14.69 US cents / kWh

• Commercial B Marginal Rate: RM 0.5951/kWh $\rightarrow$ 14.61 US cents / kWh

Item 8: Domestic Time-of-Use (ToU) Framework#

• Status: Confirmed from Primary Source.

• Primary URL: https://www.mytnb.com.my/business/understand-your-bill

Peak and Off-Peak Schedules and Rates#

1. Peak Period (Monday to Friday, 2:00 PM – 10:00 PM):

• $\le 1,500\text{ kWh/month}$: 28.52 sen/kWh

• $> 1,500\text{ kWh/month}$: 38.52 sen/kWh

2. Off-Peak Period (Monday to Friday, 10:00 PM – 2:00 PM the following day; All 24 hours on Saturday, Sunday, and 15 gazetted Public Holidays):

• $\le 1,500\text{ kWh/month}$: 24.43 sen/kWh

• $> 1,500\text{ kWh/month}$: 34.43 sen/kWh

3. Add-on Charges: Capacity Charge (4.55 sen/kWh), Network Charge (12.85 sen/kWh), and Retail Charge (RM 10.00/month, waived if $\le 600\text{ kWh}$) are identical to the General Domestic tariff.

Application of the 1,500 kWh Cliff Under ToU#

Yes, the 1,500 kWh cliff applies equally under the Domestic ToU tariff. The 1,500 kWh threshold is evaluated against total combined monthly electricity consumption (Peak kWh + Off-Peak kWh). Once total cumulative usage crosses 1,500 kWh in a billing cycle, both Peak and Off-Peak energy rates increase by exactly 10.0 sen/kWh across all kWh consumed throughout the month.