BABA compliance for battery storage (BESS): a determination guide
BABA compliance for battery energy storage: how the domestic-content rules treat BESS enclosures, racks, cells and inverters, which parts face the 55 percent test, and how to run a determination.
BABA compliance for battery storage is where a lot of clean-energy developers are now getting caught, because a battery energy storage system, or BESS, is a dense mix of steel, electronics and chemistry, and the domestic-content rules treat each layer differently. As with solar, the useful question is not whether the system is domestic but how each component classifies. This guide walks a BESS bill of materials through the three BABA categories.
A BESS is many products in one enclosure
From the outside a battery container looks like a single item. The rules see the steel shell, the racking, the cells and modules, the inverters and the balance-of-system separately, and they do not share a test.
| Item | Category | Standard |
|---|---|---|
| Steel enclosure and container | Iron and steel | All manufacturing in the US |
| Racking and structural supports | Iron and steel | All manufacturing in the US |
| Battery modules and system | Manufactured product | Over 55% US component cost |
| Inverters and power conversion | Manufactured product | Over 55% US component cost |
| Concrete pads and foundations | Construction material | All manufacturing in the US |
The steel shell is pass or fail. A container melted, formed and coated with any step offshore fails the iron and steel test regardless of what it holds inside.
Where the 55 percent test bites
The battery system itself and the power conversion equipment are manufactured products, so they answer to the 55 percent component-cost test. Cells are usually the highest-cost component, so where they were produced tends to decide the verdict. A system assembled in the US with imported cells can fall short even when everything else is domestic. Run the numbers on the real bill of materials; do not assume assembly location settles it. Our domestic content calculation guide shows the method.
A manufactured product qualifies only if it is made in the United States and its US component cost exceeds 55 percent of total component cost. (OMB M-24-02, summarised)
Timing and the obligation date
Storage procurement often runs on long lead times, so the date that matters is when your federal funds were obligated, not when the battery arrives. BABA's manufactured-products threshold is greater than 55 percent and is not scheduled to rise, but which agency standard binds your project is fixed by that obligation date: a federal-aid highway project obligated before 1 October 2026, for example, is judged on US final assembly alone. The threshold matrix carries each agency's standard and any phase schedule behind it.
When a compliant part does not exist
If a compliant component genuinely is not available at reasonable quantity or quality, a nonavailability waiver may apply, requested from and granted by the funding agency. See the waivers overview. For a related vertical, our solar compliance guide covers the same classify-first approach, and OMB's Made in America Office is the governing reference.
Run your BESS bill of materials against the manufactured-products standard, component by component.
Run the calculatorFrequently asked questions
- How does BABA apply to battery energy storage systems?
- Each part classifies separately. Steel enclosures and racking are iron and steel, judged all-or-nothing on US manufacturing, while the battery system and inverters are manufactured products subject to the 55 percent component-cost test.
- Do battery cells affect the 55 percent result?
- Usually, yes. Cells are often the highest-cost component in a storage system, so where they were produced tends to drive whether the manufactured-product clears the 55 percent threshold.
- Is a BESS steel container tested on cost?
- No. The steel enclosure and racking are iron and steel products, so every manufacturing step including coating must occur in the United States. There is no percentage for them.
- What if a compliant storage component is unavailable domestically?
- A nonavailability waiver may apply where a compliant product is not produced in sufficient and reasonably available quantities or satisfactory quality, but it must be granted by the funding agency first.
This guide is compliance guidance, not legal advice or a binding determination by any funding agency. To see the cited verdict for your own bill of materials, use the free BOM calculator, or see how the same engine works from your own code or an AI agent.
More guides
Put this into practice on your own BOM
Check a bill of materials free in your browser, cited to the OMB and agency source.