Q0034
A new substation or transmission-level connection is required when an existing distribution connection cannot safely accommodate the project, lacks the necessary physical facilities, or would require more extensive modification than a new connection arrangement. Project size is important, but the decision ultimately depends on the PSS, network configuration, available substation space and the Grid Owner’s approved connection scheme.
A new substation, switching station or transmission interconnector can add substantial cost, land requirements and development time. Developers therefore need to determine the likely connection architecture before finalising the site, plant capacity, delivery date or bid price.
A project is more likely to require major new infrastructure when:
For distribution-connected LSS, the 2024 guideline sets indicative TNB connection ranges:
These are connection categories, not automatic entitlements. The actual capacity remains subject to network conditions and the PSS. Distribution-connected LSS must connect at an existing Distribution Licensee-owned substation under the current guideline. Energy Commission: LSS Connection Guideline
For transmission-connected LSS, Malaysia’s guideline describes two principal arrangements:
1. Connection to an existing substation. This is possible if the substation has space to extend its busbars, install a complete connection bay and accommodate the required protection and control panels.
2. Connection to an existing transmission line. If connection is made by looping into a nearby overhead line or underground cable, the developer must construct a new switching station or TNB Interconnection Facility to the Grid Owner’s specifications.
Transmission-connected LSS generally means connection at 132 kV or above and capacity of at least 30 MWac, unless the Energy Commission approves otherwise. The PSS and the Grid Owner/System Operator determine the appropriate voltage, injection capacity and scheme.
The infrastructure may include:
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