Navigating Indonesia's 2026 Rooftop Solar Quota: Practical SNI & TKDN Guide for EPCs

In 2026, Indonesia’s rooftop solar market is no longer being shaped by net‑metering incentives. With MEMR Regulation No. 2/2024, exported energy is no longer credited on PLN bills, and new connections now move through a quota system on each grid. For commercial and industrial (C&I) projects, that changes the design logic. EPCs now need to focus first on self‑consumption, then make sure the structure, documentation and approval pathway all hold together.

1. What Changed with MEMR Regulation No. 2/2024

The new rooftop regulation replaces MEMR 26/2021 and brings three practical changes that every EPC should keep in mind when planning 2026 projects:

Note: Existing customers approved before the new regulation can, under transitional rules, remain under the previous scheme for a defined period. New projects, however, must be engineered for the post‑net‑metering, quota‑driven environment.

At the same time, the Energy and Mineral Resources Ministry has proposed an additional 400 MW rooftop solar quota for 2026. If PLN endorses that plan, the total annual rooftop allocation could reach around 1.4 GW. That may support project planning in areas where quota remains available and local grid conditions still allow new capacity.

2. Designing Commercial Rooftop Solar for Self‑Consumption

Without net‑metering, a rooftop system has to be shaped around the customer’s load curve, not just around the roof area. Oversizing a system simply to export more power no longer makes sense. And oversizing beyond what the roof and fixings can safely handle was never good practice in the first place.

In Indonesian C&I projects, two roof types show up again and again:

In both cases, the mounting system does more than hold the modules in place. It determines tilt angle, row spacing and how loads move into the building structure. A low-cost frame that ignores local wind and corrosion conditions can eat into project returns much faster than a modest saving on modules or inverters.

3. Using SNI 1727:2020 as the Structural Reference

For structural checks, SNI 1727:2020 has become a key reference for minimum design loads and wind actions on buildings in Indonesia. It refines how basic wind speed, exposure, building height and topography are evaluated together. In practical terms, it shares the same engineering mindset as ASCE 7 and has become one of the references reviewers increasingly look at for rooftop and ground‑mount structures.

For rooftop PV work, that usually means three things:

• No more generic wind claims. “Withstands 60 m/s” is not a calculation. EPCs are expected to show load combinations and safety factors derived from SNI 1727:2020 for the actual site.
• Fasteners and clamps matter as much as rails. Pull‑out, slip resistance and purlin stiffness often govern the design more than the rail’s nominal capacity.
• Documentation is part of the product. Static calculation reports, layout drawings and fixing details are often what move a project through internal and external reviews.

At Ziyuan Solar, we support Indonesian partners by preparing SNI‑aligned calculation packs for roof and ground‑mount projects, including wind load analysis, fixing checks and recommendations for corrosion classes in coastal or high‑humidity regions.

4. Reading the TKDN Framework More Carefully in 2026

Indonesia’s TKDN (Domestic Component Level) rules have been adjusted over time to support project execution while still encouraging local supply chain development. Under ESDM Regulation No. 11/2024, a transitional TKDN relief mechanism applied to certain PLTS projects that had already met the then-applicable timing conditions, including earlier PPA deadlines and follow-on commercial operation requirements.

In 2026, that should be read as a historical transitional window, not as a general rule for new projects. For current projects, EPCs and owners should confirm the latest TKDN thresholds, approval conditions and sourcing requirements for the relevant project category before making procurement decisions.

• Earlier projects that qualified under the transitional framework may have benefited from limited flexibility for imported components.
• Even then, those projects were still expected to support local value creation through labor, assembly, logistics and supporting services.
• For new projects in 2026, applicable TKDN treatment should always be checked against the latest project-specific rules and documentation requirements.

For mounting systems, a balanced approach usually works best. Precision‑engineered aluminum or steel components can be produced by experienced suppliers, then pre‑assembled and installed in Indonesia by local teams. Clear bills of material and transparent technical documentation help EPCs and owners show that TKDN requirements are being taken seriously without compromising structural reliability or project timelines.

5. Checklist for EPCs Planning 2026 Rooftop Projects

The EPC teams that move most smoothly in Indonesia usually follow a simple but disciplined workflow:

• Start from the load profile. Size the PV system around the factory’s daytime consumption, not around maximum roof coverage.
• Confirm roof structure early. Clarify purlin spacing, deck thickness and fixing zones before you freeze the layout.
• Use SNI‑based calculations. Align wind and load checks with SNI 1727:2020 to avoid surprises in internal or lender reviews.
• Map projects against current compliance timelines. Check the latest TKDN and permitting conditions before finalizing sourcing routes and delivery schedules.
• Treat mounting as a long‑term asset. A well‑engineered frame is cheap insurance against leak repairs, structural damage and forced downtime.

6. Meet Ziyuan Solar at Solartech Indonesia 2026

Seeing the hardware and documentation in person often answers questions faster than any brochure. Our team will be in Jakarta this April to discuss commercial rooftop and ground‑mount projects across Indonesia and Southeast Asia, with a focus on wind loads, corrosion resistance and installation efficiency.

This article is provided for general industry reference only and does not constitute legal advice or a guarantee of project approval.