Q0001 - Can Malaysia's electricity grid handle the next wave of solar?

The NETR targets renewable energy at 70% of national installed capacity by 2050, predominantly through solar, and envisages approximately 59 GW of solar capacity by then. It explicitly identifies grid limitations and the lack of alignment over the timing, scale and funding of grid investment as obstacles. National Energy Transition Roadmap
Earlier system planning used a solar penetration limit equivalent to 24% of estimated peak demand in Peninsular Malaysia and 20% in Sabah. These were planning assumptions for maintaining system stability—not immutable physical ceilings—and should be updated as storage, forecasting and grid controls improve. Malaysia Renewable Energy Roadmap
TNB reported 6,170 MW of grid-connected solar across 86 nodes and stated that the Peninsular grid could host up to 8 GW of renewable energy at grid level. This suggests near-term headroom in aggregate, but the number should not be interpreted as 1.83 GW being available everywhere: local substations and corridors can become constrained earlier. TNB Integrated Annual Report 2025
TNB publishes distribution-level nodal and hosting-capacity information for prospective projects. Connection assessments consider thermal capacity, voltage, fault levels, power quality and reliability. This is the more useful evidence for a particular solar site than a national capacity total. TNB distributed-energy integration
Grid adaptation is underway. Measures include dynamic line rating, improved visibility of distributed resources, smart meters, flexible-interconnection trials and battery storage. The 100 MW/400 MWh Santong facility in Terengganu became Malaysia’s first grid-connected utility-scale BESS, demonstrating the move from studies to operational storage. TNB grid analytics, Santong BESS announcement
The difficulty will increasingly shift from supplying the annual quantity of electricity to managing its timing. High midday solar output can coexist with steep evening demand, low minimum demand, cloud-driven ramps and transmission congestion between solar-rich and load-rich areas.
Rooftop solar and large-scale solar create different challenges. Utility projects may require new high-voltage connections and transmission corridors; concentrated rooftop deployment can cause reverse power flow and voltage-management problems on lower-voltage feeders. TNB already requires voltage-regulating transformers and/or community storage in certain new developments with aggregated rooftop solar. TNB connection guidelines
Sarawak is structurally better placed to balance solar with dispatchable hydropower, but still needs network expansion and operational coordination. It targets 1.5 GW of solar by 2030 and 3.5 GW by 2035. Sabah faces a smaller and less robust system, where rapid variable-renewable additions may require proportionally more storage, firm generation and transmission investment.

The current, independently verified solar hosting capacity of every transmission and distribution node, including capacity already reserved by approved but unbuilt projects.
How much solar can be accommodated under different assumptions for BESS deployment, demand response, curtailment, reactive-power capability and improved forecasting.
Where and how often solar curtailment is already occurring, and whether future projects will receive firm or flexible connection rights.
The future shape of net demand after rooftop solar, data centres, electric vehicles and industrial electrification are included.
Who will pay for anticipatory network upgrades: all consumers, connecting generators, large new loads or some combination.
Whether project approvals, transmission construction and BESS procurement will remain synchronized with solar awards.
How much behind-the-meter solar is installed but not fully visible to system operators.

Ministry of Energy Transition and Water Transformation (PETRA)
Energy Commission / Suruhanjaya Tenaga
Tenaga Nasional Berhad (TNB), TNB Grid and TNB Distribution
Grid System Operator and Single Buyer
Sustainable Energy Development Authority (SEDA)
Energy Commission of Sabah (ECoS)
Sabah Electricity
Sarawak Ministry of Utility and Telecommunication
Sarawak Energy
Solar developers, aggregators and corporate renewable buyers
Battery developers and flexibility-service providers
State governments and local planning authorities