SDS compliance is BESS safety’s weakest link

Estimated reading time: 5 minutes · Last updated: 22 October 2026

Documentation failures — not just faulty suppression systems — are what repeatedly slow emergency response at battery energy storage system (BESS) sites. The January 2025 fire at Vistra’s 300 MW Moss Landing facility prompted what the U.S. Environmental Protection Agency called the largest lithium-ion battery cleanup in the agency’s history, and inspection data shows the regulatory exposure is real: in fiscal year 2024 OSHA issued more than 2,500 citations under the Hazard Communication Standard. As first reported by pv magazine USA, this piece explains why current, GHS-compliant safety data sheets (SDSs) and the workflows that produce them matter, and it gives four practical actions site operators can adopt today.

The industry has done impressive work on cell chemistry, thermal runaway detection, and fire suppression, The weakest link on most sites we assess is still documentation.

a senior BESS safety consultant

Why SDS access matters more than system specs in the first 48 hours

When a cell vents or a coolant line fails, crews arrive to a fast-changing scene where a working fire suppression system is only one element of an effective response. What makes those first 48 hours operationally decisive is whether responders can identify the chemicals present, their hazards, and the correct control measures. That is why OSHA’s requirement that SDSs be "readily accessible" is pivotal: a missing or outdated SDS makes a hazard effectively invisible to somebody who did not make the chemical.

Field conditions — power outages, evacuation, off-site command posts — routinely prevent access to an on-site office computer. The material behind a hazard must therefore live in multiple, resilient formats: printed binders at known locations, offline copies on mobile devices, and a verifiable cloud backup. The material lists these as basic redundancy options because accessibility, not just existence, is what inspectors and emergency coordinators cite as a failure.

Three compliance failures that repeat across solar-plus-storage portfolios

The material sets out three real-world scenarios that illustrate distinct legal and operational gaps. In the first, a technician hands over an SDS that reflects a cell chemistry from three years earlier after the project switched to a second-source cell; the sheet no longer matches the product on site. In the second, a contractor mixes a dielectric-safe cleaning solution on-site; with no supplier-produced SDS, the contractor becomes the manufacturer of record and inherits the obligation to author an SDS. In the third, a U.S. vendor exports a product to the EU but only has an English OSHA HazCom SDS, leaving it unable to provide REACH-compliant, CLP-formatted documentation in the languages the importer requires.

What connects the scenarios is not ignorance of risk but the absence of controlled workflows that produce, update and distribute SDSs as the industry moves. The legal frame for that obligation is explicit: 29 CFR 1910.1200, OSHA’s Hazard Communication Standard, assigns duties to employers and manufacturers to ensure accurate SDSs are available.

Operational practices that close the SDS compliance gap

The material identifies four practical steps that separate prepared sites from those that attract citations. First, reconcile your chemical inventory against what’s actually on site: walk the SDS index against the physical site at least once a year to catch mid-project chemistry swaps and swapped cleaning products. Second, make SDSs reachable without a working office computer by using mobile devices, offline copies and printed binders.

Third, "Assign a named owner for every document your site authors" and record that name in the written HazCom program; this converts an ambiguous duty into an audit trail inspectors can verify. Fourth, rehearse how first responders will access your documents and provide pre-incident SDS packages at permitting when departments ask for them. Together these steps address the most-cited HazCom failures in fiscal year 2024: written program deficiencies and employee information and training gaps.

How standards and enforcement are pushing compliance toward documentation discipline

Regulation and standards activity is tightening the operational mandate. The material highlights California’s Assembly Bill 303, described as the Battery Energy Safety and Accountability Act, and continued revisions to NFPA 855 as part of the policy backdrop that raises permitting and community engagement expectations. Those developments increase the chance that inspectors and local fire departments will require pre-incident SDS access as a permit condition.

Enforcement metrics amplify that nudge: fiscal year 2024 OSHA data compiled by J. J. Keller show HazCom near the top of citation lists, with 820 citations for employee information and training failures and 203 for SDS missing for a specific chemical. Where standards, permitting and enforcement converge, the predictable outcome is demand for documented, auditable SDS workflows rather than ad-hoc binders.

The case for and against faster SDS discipline

The bottom line

The Moss Landing cleanup and OSHA enforcement figures make clear that chemical documentation is no longer an administrative detail: it is a core safety control. Operators and contractors must treat SDSs as living compliance assets — reconciled to the physical inventory, authored where necessary, assigned to named owners, and made reachable in multiple formats. That operational discipline reduces inspection exposure, speeds emergency response, and closes the weakest link the industry still shows on site.

What to watch

• Watch whether California’s Assembly Bill 303 receives a final vote; no date has been set for final action.
• Watch for local permitting offices to begin requiring pre-incident SDS packages from applicants; no universal schedule has been announced.