Solar in Sabah & Sarawak: How SESB and Sarawak Energy Rules Differ from TNB

For home and business owners in Peninsular Malaysia, installing rooftop solar panels falls under the jurisdiction of Tenaga Nasional Berhad (TNB), regulated by the Energy Commission (Suruhanjaya Tenaga) and SEDA under the Solar ATAP (Solar Accelerated Transition Action Programme) framework. However, if your property is located across the South China Sea in East Malaysia, the regulatory landscape changes significantly.

In Sabah and Sarawak, electricity distribution is managed independently by Sabah Electricity Sdn Bhd (SESB) and Sarawak Energy Berhad (SEB), respectively. Each utility operates under its own legal framework, technical grid requirements, and billing credit structures.

If you are planning to transition to clean energy in East Malaysia, here is a detailed breakdown by Ray Go Solar on how solar rules in Sabah and Sarawak differ from Peninsular Malaysia’s TNB framework and what you need to know before installing.

1. Regulatory Authorities: SEDA vs. ECoS vs. Electricity Ordinance

The governing bodies overseeing energy policies differ fundamentally across regions:

Peninsular Malaysia (TNB): Governed by Suruhanjaya Tenaga (ST) and SEDA, operating under the nationwide Solar ATAP framework (which replaced the older NEM 3.0 scheme).
Sabah (SESB): Regulatory authority over electricity supply is governed locally by the Energy Commission of Sabah (ECoS). SESB manages grid interconnectivity, requiring specialized local engineering compliance.
Sarawak (Sarawak Energy): Operates under the Sarawak Electricity Ordinance. Electricity regulations are governed directly by the Ministry of Utility and Telecommunication (MUT) Sarawak and the Electrical Inspectorate Unit (EIU).

2. Netting Mechanisms & Credit Offset Rules

How your excess solar energy is handled and credited back to your electricity bill varies drastically depending on the grid operator:

Peninsular Malaysia (TNB - Solar ATAP)

Under Peninsular Malaysia’s Solar ATAP scheme, rooftop solar power prioritizes self-consumption first. Any excess energy exported to the TNB grid earns a bill credit based on the applicable Energy Charge rate (for domestic accounts) or Average System Marginal Price (for non-domestic accounts).

Monthly Reset: Unlike previous programs, unused export credits under Solar ATAP do not roll over to subsequent months or cash out credits strictly offset the current billing month’s energy charge and reset to zero at the end of the month.

Sarawak (Sarawak Energy / SEB)

When installing solar sarawak residential or commercial systems, Sarawak Energy enforces its own localized solar framework.

Credit Rollover: Unlike Peninsular Malaysia’s Solar ATAP, excess export energy credits under Sarawak Energy’s netting scheme do not expire on a monthly reset, allowing prosumers to maximize long-term financial returns on surplus generation.
Sizing Restrictions: System sizing is strictly regulated. Under SEB guidelines, proposed residential solar capacity must be sized so generation does not exceed 75% of the property’s average monthly electricity consumption over the previous 3 to 12 months.

Sabah (SESB)

SESB utilizes specialized connection schemes, SELCO (Self-Consumption), and localized net-metering structures tailored to Sabah’s grid infrastructure. Because Sabah’s transmission grid experiences localized capacity constraints, SESB places heavy emphasis on Connection Assessment Studies (CAS) and grid-stability checks for commercial and industrial (C&I) solar installations.

3. System Capacity Limits: Single-Phase & Three-Phase

System capacity caps vary across state boundaries:

Region / Utility	Single-Phase Limit	Three-Phase Limit	System Sizing Basis
Peninsular Malaysia (TNB – Solar ATAP)	Up to 5 kWac	Up to 15 kWac (Domestic) / Up to 1 MWac (Non-Domestic)	Sized based on daytime usage profile and Connected Load.
Sarawak (Sarawak Energy)	Up to 10 kWac	Up to 30 kWac	Strictly capped at 75% of past average consumption.
Sabah (SESB)	Subject to local feeder limits	Up to transformer load thresholds	Requires localized technical clearance from SESB/ECoS.

4. State-Specific Solar Incentives and Rebates

In Peninsular Malaysia, government programs like PETRA’s SuRIA Home initiative offer targeted cash rebates for domestic installations under Solar ATAP.

Conversely, East Malaysia operates under separate funding initiatives:

Sarawak Solar Incentives: Landed home residents adopting solar sarawak solutions may qualify for state-backed solar rebates which offer tiered financial support up to RM12,000 for eligible residential accounts.
Sabah Clean Energy Push: Sabah relies on targeted state energy transition initiatives overseen by ECoS to encourage commercial rooftop adoption and off-grid solar-battery hybridization in remote areas.

Why Choose Ray Go Solar for East Malaysia Projects?

Navigating state-level utility approvals across East Malaysia requires an experienced solar EPCC partner who understands regional grid codes and regulatory processes.

At Ray Go Solar, we deliver end-to-end solar PV solutions tailored to local requirements:

Custom Engineering & System Sizing: We design single-phase and three-phase systems optimized to meet Sarawak Energy’s 75% consumption cap or SESB’s technical connection criteria.
Full Utility Liaison: Our team handles all documentation, site assessments, and testing procedures with ECoS, SESB, and Sarawak Energy EIU-certified personnel.
Tier-1 Components & Warranty: We supply high-efficiency solar modules and smart inverters designed to withstand tropical coastal humidity and equatorial weather patterns.
Off-Grid & Hybrid Expertise: For remote plantation sites, longhouses, or resort properties outside grid coverage in Sabah and Sarawak, we engineer robust LiFePO4 solar-plus-storage microgrids.

Power Your Property with Ray Go Solar Today

Whether you are seeking to reduce residential electricity bills in Kuching, lower commercial operating costs in Kota Kinabalu, or power off-grid industrial operations, Ray Go Solar is ready to help you navigate SESB and Sarawak Energy regulations smoothly.

Contact Ray Go Solar today for a customized energy assessment and hassle-free solar installation.