Energy Storage Certification in Belgium: The Complete Guide to C10/26, C10/11 and AREI/RGIE Compliance
Belgium is one of Europe’s most structured — and most demanding — markets for grid-connected energy storage. As an EU member state, the country applies CE marking and the EU Battery Regulation (EU) 2023/1542 directly, and its grid connections follow the European Requirements for Generators, RfG (EU) 2016/631. However, what truly defines market access in Belgium is a national layer that no exporter can afford to ignore: the Synergrid C10/26 homologation list, the C10/11 distribution grid code, and the mandatory AREI/RGIE electrical inspection before commissioning.
This guide explains how the Belgian certification system works, what changed with the 2024–2025 amendments (including plug-and-play batteries), and what you — as a manufacturer or buyer — must do to stay compliant.
1. How Belgium Structures Its Grid Connection Framework
Belgium operates a two-layer grid connection framework.
At the transmission level (federal): The Federal Technical Grid Code — which the Belgian legislator established by Royal Decree of 22 April 2019 and published in the Belgian Official Gazette on 29 April 2019 — governs connections to the high-voltage network that Elia operates. Under the RfG framework, storage modules fall into power-generating module Types A–D.
At the distribution level (regional): The technical prescription C10/11, which Synergrid (the federation of Belgian grid operators) issues, governs distribution-level connections. It becomes binding once the three regional regulators approve it:
- VREG — Flanders
- CWaPE — Wallonia
- BRUGEL — Brussels
Because of this dual structure, a single storage product may need to satisfy federal grid code requirements, Synergrid technical prescriptions, and regional registration procedures all at the same time.
2. C10/11 Version Evolution: Why 2024–2025 Matters
The C10/11 prescription has evolved rapidly, and each amendment directly affects product compliance:
| Version | Date | Key changes |
| ed.2.1 | From 1 September 2019 | Introduced EN 50549 requirements and explicit storage provisions |
| ed.2.2 (amendment) | Published 17 October 2024, effective 17 April 2025 | Removed the fixed-connection obligation; allows plug-and-play devices (balcony PV, small mobile batteries, bidirectional EV chargers) to connect after C10/26 certification |
| ed.2.3 (amendment) | Published 15 October 2025 | Further updates to the prescription |
| ed.2.4 (consolidated, current) | 15 October 2025 | Current consolidated version; from this date the P1 port of the digital meter may be used as a power-management reference |
3. C10/26 Homologation: Belgium’s De Facto Market Access Gate
The Synergrid C10/26 homologation list is the single most important certification for entering the Belgian market. Every grid-connected generation or storage unit — PV inverters, battery inverters, hybrid inverters, bidirectional EV chargers — must pass Synergrid homologation before installation and commissioning, and must appear on the official list.
Here are the key facts about C10/26:
- Listed by firmware version — a firmware update can trigger re-homologation
- Free of charge — Synergrid does not charge for homologation
- Includes requirements for automatic disconnection / anti-islanding protection (C10/11 §7.5)
- Prefers EN 50549-1 / -2 / -10 test reports as test evidence
- Requires laboratory testing of the grid disconnection relay (NOR) for units above 30 kVA
- Since 17 April 2025, even plug-and-play batteries need a dedicated C10/26 plug-and-play listing
What happens without it? You may still import and sell the equipment, but you cannot legally connect it to the Belgian grid — which reduces its commercial value to effectively zero. Inspection bodies and DSOs verify the list at registration, and tenders use it as a first screening criterion, checking by brand, product reference number, and firmware version.
4. AREI/RGIE: The Mandatory Electrical Inspection Before Commissioning
Beyond homologation, every installation must clear an electrical inspection. The AREI/RGIE (General Regulations on Electrical Installations), which the Belgian legislator established by Royal Decree of 8 September 2019 and which has applied since 1 June 2020, creates a mandatory inspection regime that accredited inspection bodies such as Vinçotte, BTV, OCB, and ACEG carry out:
- New installations and modifications — including adding a battery to an existing system — must pass inspection before commissioning
- The inspection body (not the installer) issues the certificate of conformity, which remains valid for 25 years
- Without this certificate, the DSO will refuse commissioning registration
- A Royal Decree of 6 October 2025 overhauls the DC-side provisions for PV and batteries, applicable from 1 April 2026
What happens without it? Illegal operation, administrative fines (in Flemish practice reaching the order of €1,500), mandatory remediation, and paid re-inspection if the first inspection fails.
5. DSO Registration: Fluvius, ORES, RESA, and Sibelga
In addition to certification and inspection, grid operator registration is a separate, mandatory step:
- Flanders — Fluvius: storage registration has been mandatory since 1 January 2017 via Mijn Fluvius; it is free online for units below 25 kVA. Plug-in devices with a combined power of 800 W or more must be registered within 30 days.
- Wallonia: ORES, RESA, AIEG, AIESH, and REW handle registration.
- Brussels: Sibelga handles registration.
Registration typically requires the AREI inspection certificate, a single-line diagram, and CE/certification documents. Without registration, you receive no feed-in compensation and no digital-meter interaction.
6. Federal Storage Licence and Declaration Thresholds
For larger projects, a federal layer applies on top:
- Above 25 MW net capacity: a new storage facility requires a storage licence from the Federal Energy Minister, following a CREG opinion.
- 25 MW or below: a prior declaration to the Directorate-General for Energy and CREG is required.
7. Certification Checklist by Priority Level
To bring all requirements together, the following checklist ranks every certification and standard by priority:
| Level | Certification / Standard | Issuing body | Why it matters |
| A | CE marking + EU Battery Regulation (EU) 2023/1542 | European Union | Legal requirement for placing on the market; in force since 17 August 2023 |
| A | UN 38.3 | United Nations | Mandatory for transport; long-standing requirement |
| A | AREI/RGIE accredited inspection (pre-commissioning; adding a battery counts as a modification) | FPS Economy (accreditation system); inspection bodies | No certificate of conformity = no commissioning; current regime applies since 1 June 2020; DC overhaul from 1 April 2026 |
| A | Federal storage licence (>25 MW) / declaration (≤25 MW) | Federal Energy Minister, CREG | Legal prerequisite for utility-scale storage |
| B | Synergrid C10/26 homologation list (per C10/11 Annex D; by firmware version) | Synergrid | Non-listed inverters/batteries cannot connect to the grid; current list corresponds to C10/11 ed.2.4 (15 October 2025); plug-and-play since 17 April 2025 |
| B | Synergrid C10/11 technical prescription (protection, frequency/voltage behaviour, automatic disconnection §7.5, EnFluRi/P1 power management) | Synergrid | Distribution connection threshold; NOR lab test above 30 kVA |
| B | Federal Technical Grid Code (transmission level, storage modules Type A–D) | Royal Decree / Elia / CREG | Technical requirements for high-voltage (Elia) connections; Royal Decree of 22 April 2019 |
| B | DSO registration (Fluvius Mijn Fluvius, etc.; AREI certificate + single-line diagram) | Fluvius / ORES / RESA / Sibelga | No registration = no feed-in compensation; Fluvius storage registration mandatory since 1 January 2017 |
| B | EN 50549-1/-2/-10 test reports | Recognised by Synergrid | Preferred test basis for C10/26 applications |
| C | IEC 62619, IEC 62933 series; RESCert installer qualification; UL 9540A | Standards bodies; RESCert; UL | Voluntary/value-adding: procurement due diligence, tender scoring, insurance |
8. What Certification Means in Practice
Understanding the rules is one thing; seeing how they play out commercially is another. In practice, certification touches every stage of the product lifecycle:
8.1 Market access (import, sales, customs)
Without CE marking or EU Battery Regulation compliance, you cannot legally sell the product. Without C10/26 listing, you cannot legally connect it to the grid — the hardest access point compared with neighbouring countries, and one that now extends even to plug-in batteries.
8.2 Installation and grid connection
Without the AREI inspection certificate, the DSO refuses commissioning registration. Moreover, failed inspections require paid re-inspection and remediation.
8.3 Procurement and tenders
Tenders and distribution channels treat the C10/26 list as the first screening criterion, verified by firmware version. Buyers should therefore check the Synergrid website by brand and product reference number before placing an order — not on the list means disqualified.
8.4 Subsidies
The Flemish home battery subsidy ended on 31 March 2023. The remaining regional support measures (Brussels/Wallonia schemes, tax rebates) all rely on the AREI certificate and DSO registration as proof — no proof, no claim.
8.5 Insurance and financing
Fire insurers commonly require the AREI inspection certificate and proof of compliant installation; likewise, financing due diligence requires C10/26 homologation and grid registration. Without them, insurers may reject claims and financing can fall through.
9. Five Practical Recommendations for Suppliers and Buyers
Based on everything above, here are five concrete actions you can take:
- Treat C10/26 homologation as priority #1 for Belgium. Submit the technical file (EN 50549 test reports, datasheets) to Synergrid early. Remember that Synergrid manages the list by firmware version — firmware updates must be re-homologated, and plug-and-play versus fixed-installation variants need separate product reference numbers.
- Ensure battery-capable inverters carry dual approval. Hybrid inverters must hold the additional “storage” use-case approval, not just PV approval.
- Ship an AREI-ready documentation package with every unit: a single-line diagram template, the EU Declaration of Conformity, an installation manual (in Dutch and French), and automatic disconnection (§7.5) documentation.
- Remind buyers of their registration duties. In the Fluvius area, plug-in devices totalling 800 W or more must be registered within 30 days; fixed installations register free of charge, and registration is the precondition for feed-in compensation.
- Track the regulatory calendar. C10/11 ed.2.4 is the current edition, and the AREI DC-side overhaul applies from 1 April 2026 — update your Belgium-specific settings and documentation accordingly.
10. FAQ: Battery Certification in Belgium
Is CE marking enough to sell a home battery in Belgium?
No. CE marking and the EU Battery Regulation (EU) 2023/1542 allow you to place the product on the market, but grid connection additionally requires Synergrid C10/26 homologation, an AREI/RGIE inspection, and DSO registration.
What is the C10/26 list?
It is Synergrid’s official homologation list of grid-connected generation and storage units approved for the Belgian distribution grid, maintained per product reference and firmware version under the C10/11 technical prescription.
Do plug-and-play (plug-in) batteries need certification in Belgium?
Yes. Since 17 April 2025 (C10/11 amendment ed.2.2), plug-and-play devices such as balcony PV, small mobile batteries, and bidirectional EV chargers may connect to the grid — but only with a C10/26 plug-and-play listing. In the Fluvius area, plug-in devices totalling 800 W or more must also be registered within 30 days.
Do I need a new inspection when adding a battery to an existing solar installation?
Yes. Under AREI/RGIE, adding a battery counts as a modification and requires re-inspection by an accredited body before commissioning.
What test reports do I need for C10/26 homologation?
EN 50549-1, -2, and -10 test reports are the preferred evidence. Units above 30 kVA additionally need laboratory testing of the grid disconnection relay (NOR).
Is the Flemish home battery subsidy still available?
No. It ended on 31 March 2023. Current support consists mainly of regional measures and tax rebates, which change frequently and require AREI and DSO registration documents.
11. Official Sources
| Authority | Document / Page | Date |
| Synergrid | Homologation of decentralised production units (C10/26 list and procedure) | Continuously updated (plug-and-play notice 17 October 2024) |
| Synergrid | Info 11.2024 – Plug & Play in Belgium (C10/11 amendment ed.2.2) | Published 17 October 2024; effective 17 April 2025 |
| Synergrid | C10/26 homologation procedure | Version of 29 April 2020 |
| Fluvius | Home battery registration requirements (Mijn Fluvius) | Current |
| Belgian Official Gazette (ejustice) | Royal Decree on the Federal Technical Grid Code | Decree of 22 April 2019; Gazette 29 April 2019 |
| FPS Economy / AREI-RGIE | General Regulations on Electrical Installations and accredited inspection bodies | Royal Decree of 8 September 2019, applicable 1 June 2020; DC overhaul by Royal Decree of 6 October 2025, applicable 1 April 2026 |
| CREG | Storage licence (>25 MW) and declaration (≤25 MW) | Current |
| Elia | Legal framework – Belgium | Continuously updated |
| Vinçotte (accredited inspection body) | NOR grid disconnection relay laboratory testing (>30 kVA, citing C10/11 ed.2.4) | Retrieved June 2026 |
