Practical insights on energy, building automation, and compliance for buildings and industry, by the Cobler team.
TNB Bills & TariffsUnder TNB's RP4 tariff, every kW kept off your monthly peak interval is worth RM89.27 to RM97.06. Whether a standby genset can beat that depends on one number: how many hours a month it has to run.
TNB Bills & TariffsA Medium Voltage site peaking at 1,000 kW pays around RM89,270 a month in demand charges before any energy is billed. Nine common causes of a jumped commercial TNB bill, each with what to check on the bill and what to check in the building.
TNB Bills & TariffsLoad factor tells you whether you are paying TNB for capacity you actually use or capacity you touch once a month. Here is the formula, a worked RP4 example where two identical-kWh sites sit RM26,781 apart, and how to raise it.
TNB Bills & TariffsConnected load is the sum of your nameplate ratings. Maximum demand is the highest 30-minute average your meter records, and it is the one TNB charges you for. Here is the difference, the demand factor that links them, and what it costs in ringgit.
HVAC & Chiller PlantsA practical decision guide for Malaysian buildings: where the size crossover between DX and chilled water actually sits, how the two compare on kW/RT, redundancy, space and lifecycle cost, and why one gets metered while the other fails quietly.
TNB Bills & TariffsOn 1 July 2025 TNB retired the C1, C2, E1 and E2 letters and replaced them with voltage-based categories, each with a General or Time-of-Use option. Here is how the new TNB tariff categories work, where your old letter lands, and what the five bill components actually cost you.
Energy Monitoring & AnalyticsYour TNB bill reports maximum demand weeks after the half-hour that caused it. Live maximum demand monitoring, a threshold set below the ceiling you are willing to pay for, and alerts that fire mid-interval give operators 10 to 15 minutes to act.
TNB Bills & TariffsRooftop solar cuts kWh, but it rarely touches the maximum demand charge that TNB bills on a single 30-minute interval. Here is why, and what actually protects your kW line under RP4.
Energy Monitoring & AnalyticsA wrongly wired meter still talks to Modbus and fills a dashboard with plausible numbers. This field checklist catches the wiring errors in the data before you sign practical completion.