Sertifikat Laik Operasi (Operational Worthiness Certificate) — SLO
Regulation
SLO, or Sertifikat Laik Operasi (Operational Worthiness Certificate), is an electrical certification document generally required before an on-grid rooftop solar (PLTS Atap) installation can be connected to and operated on the PLN grid.
The certificate is issued by a registered Technical Inspection Body (LIT) — for residential low-voltage installations, generally by an LIT-TR (Low Voltage) — after an inspection of the installation's conformity with the applicable electrical safety standards [UU No. 30 Tahun 2009 Pasal 44 ayat (4)].
The legal basis for the SLO derives from Law No. 30 of 2009 on Electricity, which in Article 44 paragraph (4) requires every operating electrical installation to hold an SLO. In the context of rooftop solar (PLTS Atap), Permen ESDM No. 2 Tahun 2024 — which revokes and replaces Permen ESDM No. 26 Tahun 2021 — retains the technical inspection and SLO requirement as a condition for connecting an installation to the grid of an IUPTLU holder [Permen ESDM No. 2 Tahun 2024, jdih.esdm.go.id].
Based on this framework, an on-grid rooftop solar installation to be connected to an IUPTLU holder's grid generally must obtain an SLO before it can be operated, and that SLO must be obtained within the period set after the connection approval is issued [Permen ESDM No. 2 Tahun 2024]. The process involves a physical inspection of the installation by a certified LIT inspector against the PUIL (General Requirements for Electrical Installations) standard and related IEC standards, including the inverter specification, anti-islanding protection, and the grounding system.
An SLO is not valid permanently without limit: although the regulation sets no standard numeric threshold triggering re-certification, industry practice and LIT custom treat a material increase in capacity or a change in system configuration as grounds for re-certification by the competent LIT.
Indonesian PLTS Application Example
A homeowner installing a 5 kWp on-grid rooftop solar system in Greater Jakarta generally needs an SLO from a registered LIT-TR before PLN can grant connection approval and the system can operate. The inspection process covers checks on cabling installation quality, the inverter specification, the protection system, and the overall safety of the installation. Without an SLO, the system cannot be operated legally, and the net metering benefits under the applicable regulation cannot be accessed.
Sources & References
- Law No. 30 of 2009 on Electricity, Article 44 paragraph (4), jdih.esdm.go.id (2009)
- Permen ESDM No. 2 Tahun 2024 on Rooftop Solar Connected to the Electricity Grid of IUPTLU Holders (revoking Permen ESDM No. 26 Tahun 2021), jdih.esdm.go.id (2024)
See Also
On-Grid
On-grid, or grid-tied, is a solar PV (PLTS) scheme that is connected in parallel with the PLN grid and uses no battery. The inverter synchronizes its output to PLN's voltage and frequency; when the panels produce more than the load, the surplus flows to the grid, and when production is insufficient, the load draws from the grid.
Net Metering
Net metering is an electricity accounting scheme that credits the surplus energy a rooftop solar (PLTS Atap) system exports to the PLN grid against the customer's bill. In Indonesia, this scheme has been abolished for new customers since [Permen ESDM No. 2 Tahun 2024] took effect on 31 January 2024.
PPA
(Power Purchase Agreement)PPA, or Power Purchase Agreement, is a long-term electricity sale-and-purchase agreement between a solar PV (PLTS) developer (developer/IPP) and an electricity user (off-taker), in which the off-taker pays a per-kWh tariff for the electricity consumed — rather than buying or owning the solar panel system.