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.
Key message for EPCs:
Winning rooftop solar projects in Indonesia are no longer just about low pricing. What matters now is whether the system is structurally sound under SNI load standards, whether it fits the current PLN quota framework, and whether the project is planned around the applicable TKDN requirements and project-specific timing.
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:
| Aspect | Before (MEMR 26/2021) | Now (MEMR 2/2024) |
|---|---|---|
| Billing & net‑metering | Exported energy offset part of the monthly PLN bill through a net‑metering multiplier. | No net‑metering. Exported energy is no longer credited on the bill, so project economics now rely much more on self‑consumption. |
| Capacity limit | System size was capped at up to 100% of the connected capacity. | No simple percentage cap. Installed capacity depends on the available rooftop solar quota on each PLN grid. |
| Connection pathway | Case‑by‑case approval; less emphasis on system‑wide quota. | PLN prepares a five‑year development quota per grid. New projects must fit into that quota before they can move forward. |
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:
| Roof Type | Typical Use Case | Key Risks | Mounting Strategy |
|---|---|---|---|
| Trapezoidal metal roof | Factories with long daytime shifts and relatively stable daytime load. | Water leakage at fixings, sheet deformation, wind uplift at eaves and corners. | Low‑profile mini‑rail systems with tested clamp pull‑out values, short spans, and careful edge‑zone layout to handle uplift. |
| Tile roof / mixed structures | Commercial buildings with more varied occupancy and older structures. | Unknown rafter conditions, brittle tiles, uneven surfaces. | Stainless steel hooks tied into structural members, conservative spacing, and lower design tilts to reduce uplift and slip forces. |
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.
Event Details
Exhibition: Solartech Indonesia 2026
Dates: 22–24 April 2026
Venue: Jakarta International Expo (JIExpo), Kemayoran
Ziyuan Solar Booth: A3M3-05
If you are working on challenging factory roofs, coastal projects or tighter financing conditions, visit Booth A3M3-05 to review mounting concepts and learn how we approach SNI‑based engineering, PLN quota constraints and project-specific sourcing coordination.
FAQ: Indonesia Rooftop Solar, Quota, SNI and TKDN
Q1. Does rooftop solar still make sense in Indonesia without net‑metering?
Yes, especially for C&I customers with strong daytime loads. Without net‑metering, systems must be sized more carefully for self‑consumption, but electricity prices and PLN’s gradual increase of rooftop quotas mean well‑designed projects can still reach attractive payback periods, depending on quota availability and project conditions.
Q2. What is the practical impact of MEMR Regulation No. 2/2024 on EPCs?
The regulation removes bill credits for exported energy and introduces grid‑specific rooftop quotas. EPCs now need to check quota availability, tailor system size to the customer’s load, and provide stronger technical documentation when applying for grid connection.
Q3. How does SNI 1727:2020 relate to solar mounting design?
SNI 1727:2020 defines minimum design loads and wind actions for buildings and structures in Indonesia. For solar mounting, it guides how basic wind speed, exposure and building geometry translate into uplift, downforce and sliding forces on modules, rails, clamps and fixings.
Q4. Can foreign mounting systems comply with TKDN requirements?
Yes, if they are integrated into a project that follows the applicable TKDN rules and combines imported precision components with local pre‑assembly, installation and services where appropriate. Clear bills of material and documentation make it easier for project owners to demonstrate compliance.
Q5. Why meet suppliers at Solartech Indonesia 2026 instead of working only online?
For rooftop and ground‑mount structures, small details such as clamp geometry, fastener coatings or documentation style often decide whether a project passes internal approval. Meeting face‑to‑face at Solartech Indonesia 2026 helps EPCs align engineering expectations, sourcing strategies and delivery schedules upfront.
This article is provided for general industry reference only and does not constitute legal advice or a guarantee of project approval.
