The European Commission has formally issued Implementing Regulation (EU) 2026/1423, dated 7 August 2026, introducing new compliance requirements for battery energy storage systems (BESS) entering the EU market from 1 October 2026. The regulation lands in the middle of a record build-out year for European storage and pushes a substantial share of compliance work onto hardware design, testing and documentation rather than project-level permitting.

Two technical pillars: EMC and thermal runaway

From 1 October 2026, every BESS placed on the EU market must complete updated CE-EMC electromagnetic compatibility testing and provide a new UL 9540A thermal runaway propagation assessment report. The two requirements target different risks: EMC testing addresses grid-side interference and compatibility with network and communications equipment, while the UL 9540A report documents how fire and thermal propagation behave at cell, module, unit and installation level.

For suppliers, the practical consequence is that test slots — not component availability — may become the binding constraint on delivery schedules into Q4 2026 and 2027 project pipelines.

Battery passport data must be filed by an EU authorised representative

The regulation requires battery passport data to be uploaded by an EU authorised representative. That elevates the representative from a nominal address on a declaration of conformity to an operational role responsible for document coordination and for the timing of data submission. Storage buyers evaluating suppliers should therefore expect the identity and mandate of the authorised representative to appear in tender documentation and supply contracts.

Who carries the burden

The new rules affect certification pathways, testing timelines, battery passport data handling, compliance costs and delivery schedules. The affected parties span exporters, testing teams, EU authorised representatives, buyers and project delivery managers.

For project delivery managers, the risk is concentrated in schedule: a certification step that slips by weeks can push commissioning past grid-connection milestones or revenue windows in wholesale and balancing markets. For exporters, the cost of re-testing existing product families and re-issuing documentation must now be priced into European bids, where competition from EU-assembled systems is intensifying.

What to watch next

The key indicators in the coming months will be testing laboratory lead times, whether notified bodies publish guidance on the interaction between CE-EMC and the UL 9540A report, and how buyers in Germany, Italy, Poland and the Netherlands write the new documentation set into procurement terms. Suppliers that have already completed EMC re-testing and hold current thermal runaway reports are likely to hold a short-term advantage in auction and capacity-market-backed project schedules.

Source: MarketScope Live

This article was assisted by AI analysis. Please refer to the original source for official information.