Sungrow Turns to Samsung SDI as U.S. Bans Reshape Grid Storage

Sungrow, one of the world’s largest energy storage integrators, is moving to source battery cells from South Korea’s Samsung SDI after a wave of U.S. regulations began locking Chinese-linked components out of the American grid storage market. For a company headquartered in China, this is not a hedge against future risk. It is a response to rules already in force.

The pressure has been building through 2026. An August 2026 bulk-power executive order, a July 2026 federal ban on Chinese inverters that named Sungrow directly, and an expanding Defense Department list of restricted Chinese firms have combined to make Chinese-content supply chains difficult to sell into the U.S. market. Sungrow’s pivot to Samsung SDI cells is a direct answer to those actions.

Here is what this deal tells you about which companies are positioned to benefit as the US energy storage supply chain undergoes its most significant restructuring in a decade. The read-through extends well beyond these two firms, to cell makers, critical minerals suppliers, and every integrator now forced to choose between localising and losing access.

The regulations that made this deal unavoidable

The Sungrow decision did not emerge from a single rule. It emerged from a stack of them, layered over several months, each one narrowing the space a Chinese-headquartered integrator can operate in.

The first structural blow came in mid-year. On 10 June 2026, the Department of Defense (DoD) updated its Chinese military companies list to include CATL, BYD, EVE Energy, JA Solar, Trina Solar, and China Three Gorges. The procurement ban attached to that list takes effect in 2027 and reaches affiliates under a 50%-ownership rule.

Then came the direct hit. On 28 July 2026, the Federal Communications Commission (FCC) banned new imports of Chinese-made grid-connected inverters, explicitly naming Sungrow and Huawei. That elevated the issue from a general sector risk to a company-specific constraint, with Sungrow’s own hardware written into the rule.

The August 2026 executive order sealed the broader market. Issued on 26 August 2026, it directs the Department of Energy (DOE) to bar the purchase, import, and installation of foreign-produced bulk-power equipment, including battery energy storage systems (BESS) and grid-connected inverters, on transmission systems of 69 kV and above. The DOE was given 120 days to issue implementing rules.

How the tax credit rules add a financial disqualification layer

The bans above are security measures. The tax credit rules work on a different logic, and they can disqualify a project even where physical importation remains legal.

To qualify for technology-neutral tax credits such as the 48E and 45Y project credits, a project cannot exceed set thresholds of Chinese-origin content under Foreign Entity of Concern (FEOC) rules: 55% for construction starting in 2026, rising to 75% after 2029. A newer Prohibited Foreign Entity (PFE) layer adds an ownership-based test that restricts PRC-linked investors regardless of content.

Section 301 tariffs sit on top of all of it, reaching up to 125% on some Chinese-origin lithium-ion batteries. What this means for Sungrow is not one regulatory risk but several at once, and a single supply chain adjustment may not clear all of them.

What the Sungrow-Samsung SDI arrangement involves

Start with what is confirmed. Sungrow intends to source Samsung SDI battery cells and integrate them into its own storage systems, with the explicit goal of preserving access to the U.S. market. That much is not in dispute.

The commercial terms are less certain. South Korean industry reports from early September 2026 indicated that the deal would span three years, delivering several gigawatt-hours annually at a total contract value running into the trillions of Korean won. Sungrow and Samsung SDI have not officially disclosed procurement volume, contract value, or delivery schedules, so those figures should be read as reported rather than confirmed.

The relationship itself is not new. The two companies agreed a joint venture for the Chinese market back in 2014, with manufacturing beginning in 2016 at a facility in Hefei, Anhui province. What is new is the direction: non-Chinese cells sourced specifically to satisfy U.S. rules.

Several structural questions remain open:

• Where Sungrow’s containerised systems using these cells will be assembled.
• Whether those systems comply with the foreign-produced grid equipment rules now in force.
• Whether Samsung SDI will supply Sungrow from its U.S. production sites or from plants elsewhere.

Sungrow’s U.S. manufacturing stance Sungrow has made clear in public statements that it holds no present intention to build manufacturing capacity inside the United States.

That last point is the most consequential confirmed fact in the deal. Whether the cells arrive from Samsung SDI’s U.S. facility or from overseas plants determines whether the arrangement genuinely resolves Sungrow’s compliance exposure or only partly addresses it. For investors tracking either company, that is the difference between a settled solution and an arrangement to watch.

Samsung SDI’s U.S. production build-out and why it matters here

Samsung SDI’s U.S. manufacturing strategy exists as a business in its own right, and understanding it is what makes the Sungrow partnership commercially credible as a compliance path.

The centre of that strategy is StarPlus Energy, a joint venture with Stellantis in Kokomo, Indiana. Production lines there are being partially redirected from electric vehicle batteries toward stationary storage cells, positioning the plant for exactly the demand the new U.S. rules are creating.

The company plans to begin mass production of prismatic LFP cells at the Indiana site in the fourth quarter of 2026, with an annual U.S. storage cell capacity target of roughly 30 GWh by the end of 2026. Both figures are unverified industry expectations rather than confirmed output. Industry analysts have gone further, describing Samsung SDI as the only non-Chinese supplier of prismatic LFP cells for North American grid storage, a characterisation that should also be treated as an unverified analyst view.

The build-out has moved in clear steps:

1. StarPlus Energy joint venture established with Stellantis in Kokomo, Indiana.
2. Production lines partially pivoted from EV batteries to stationary storage cells.
3. Prismatic LFP cell mass production targeted for Q4 2026.
4. L&F cathode materials supply agreement signed in March 2026.

For investors, this reads as a supply chain being deliberately constructed to absorb the demand that Chinese integrators are being forced to redirect. The Sungrow arrangement is an early and visible sign of that thesis playing out.

Building a non-Chinese input chain, not just a non-Chinese factory

A non-Chinese factory still needs non-Chinese inputs, and this is where the L&F agreement matters.

Signed in March 2026, the deal commits Samsung SDI to purchase LFP cathode materials from South Korean materials company L&F over a three-year term, valued at KRW 1.6 trillion (approximately $1.1 billion), with deliveries beginning in 2027. That is evidence of a supply chain built to insulate U.S. output from FEOC exposure at the materials level, not just at assembly.

The timing carries one caveat worth noting. Because deliveries start in 2027, there is a window in which Samsung SDI’s U.S. production may still carry some Chinese-origin materials content. For a compliance-driven partnership, that gap is not trivial.

Does sourcing non-Chinese cells actually solve the compliance problem?

Here is where the story refuses to resolve cleanly. Sourcing non-Chinese cells is necessary, but it may not be sufficient, because a battery system is more than its cells.

The most immediate gap is the inverter. Sungrow’s inverters were named directly in the FCC’s 28 July 2026 ban, which means a containerised system fitted with non-Chinese cells but Chinese-manufactured Sungrow inverters could still be blocked from new U.S. grid interconnections. The cell swap does nothing for the component that triggered the company-specific rule in the first place.

The tax credit maths compounds this. FEOC eligibility depends on the aggregate Chinese-origin content of the entire project, not the cells alone, so inverters, battery management systems (BMS), and modules all count toward the threshold. The PFE rules add a separate ownership test: Chinese corporate involvement through minority shareholding, debt, or licensing can disqualify a project regardless of where the cells were made.

The compliance vectors that non-Chinese cell sourcing does not resolve include:

• Inverter origin, already named in the FCC ban.
• BMS and module FEOC content.
• PFE ownership-structure exposure.
• Aggregate project content thresholds across all components.

A cautionary precedent The DOE’s rejection of Microvast’s grant application in May 2023 over its China ties illustrates that corporate governance and ownership structure can override physical supply chain adjustments.

Contrast that with the localisation path other suppliers have taken. LG Energy Solution has reportedly secured a $4.3 billion LFP cell supply agreement for Tesla Megapack 3 lines in Lansing, Michigan from 2027, committed 5 GWh of ESS batteries for Hanwha Qcells projects from its Michigan plant across 2028-2030, and signed a 10-year cathode offtake with Smackover Lithium in Arkansas specifically to meet non-PFE requirements. Those figures are unverified, but the pattern is instructive.

For investors, this is where the real signal lives. Treat the Sungrow deal as a first move in an ongoing restructuring, not a completed solution.

Where the U.S. storage supply chain goes from here

The reason any integrator is willing to bear the cost of restructuring is the size of the prize. According to industry estimates, the U.S. market installed 18.9 GW and 51 GWh of battery storage in 2025, a 52% year-on-year increase, with an alternative estimate putting total additions at 57.6 GWh and cumulative utility-scale storage at 137 GWh. Those figures are unverified, but the direction of travel is clear enough to justify the effort.

The Sungrow-Samsung SDI arrangement is best read as an early, visible signal of a broader restructuring wave that will reshape the competitive field across 2026 and 2027. Sungrow has stated it intends to expand collaboration with non-Chinese companies across components and services, which frames this as one step in a longer adjustment.

Three categories of company are positioned to benefit:

• Non-Chinese cell manufacturers with U.S. production, such as Samsung SDI and LG Energy Solution.
• U.S. and allied-nation critical minerals suppliers meeting non-PFE sourcing rules.
• Integrators that achieve full-stack hardware and corporate-structure compliance earliest.

The milestone to have on your calendar The DOE’s 120-day rulemaking window from 26 August 2026 is the next concrete regulatory milestone. Its implementing rules will do more than any single deal to determine which supply chain configurations remain viable.

For investors in mining, critical minerals, and storage infrastructure, the next twelve months will settle which configurations survive. The companies that move earliest and most comprehensively on full-stack localisation are the ones to watch.

This article is for informational purposes only and should not be considered financial advice. Investors should conduct their own research and consult with financial professionals before making investment decisions. Past performance does not guarantee future results, and several figures cited here are reported or unverified industry estimates subject to change based on market developments and regulatory outcomes.