SB Energy files for IPO, revealing the scale and risk of AI infrastructure tied to OpenAI and Nvidia

SB Energy, the SoftBank Group subsidiary that develops data centers and power infrastructure for AI workloads, filed for a US initial public offering on September 1, 2026. Reports indicate the company aims to raise between $5 billion and $7 billion at a valuation potentially above $50 billion. For AI builders, the filing offers a rare look at how the physical layer of the AI supply chain is being financed and where the concentration risks live.

SB Energy’s IPO filing reveals the scale of AI infrastructure spending

SB Energy is not a traditional data center operator. It builds and owns both power generation assets and data center campuses, marketing the combination as a way to optimize electricity costs for large AI customers. In the first half of 2026, the company reported just $139 million in revenue and a net loss of $3.2 billion, with nearly all revenue coming from energy infrastructure projects. Its long-term growth bet is on data center development, reflected in a $430 billion project backlog.

Currently, SB Energy operates a 900-megawatt solar farm in Texas that supplies power to a Google data center, and it is constructing two energy storage facilities in California, one paired with a 580-megawatt solar array. But the flagship project is PORTS-Pike, a 10-gigawatt data center campus in Ohio being built for OpenAI Group PBC. That campus requires a $33 billion power plant and $4.2 billion in new transmission lines.

The OpenAI and Nvidia relationship is the engine and the risk

OpenAI is SB Energy’s primary customer across three campuses: the 10 GW Ohio site and two Texas campuses totaling 1.59 gigawatts. Nvidia is heavily involved as well. According to the IPO prospectus, Nvidia has committed to a residual value guarantee worth up to $105 billion for 4.25 GW of PORTS-Pike capacity, with an option to backstop another 3.78 GW. The chipmaker also committed to buying $1.5 billion of SB Energy shares at the listing price, and OpenAI holds $5.5 billion in stock warrants.

The prospectus explicitly flags “substantial dependence on OpenAI” as a risk. If OpenAI’s demand or financial position changes, the entire project pipeline could stall. Nvidia’s involvement reduces some risk, but the concentration is extreme.

What this means for AI infrastructure builders

The SB Energy IPO matters beyond finance. It represents a test of whether the vertically integrated power-and-data-center model can scale. If successful, it could accelerate the deployment of dedicated AI compute capacity. But the model also concentrates risk: one customer, one chip supplier, and massive upfront capital commitments with long construction timelines.

For builders evaluating AI infrastructure partners, the filing underscores the importance of understanding the power arrangement and the counterparty dependencies. A data center tied to a specific power plant and transmission buildout is less flexible than a colocation facility. That may matter for teams that want to scale compute without being locked into a single customer’s roadmap.

Caveats and open questions

Several numbers in the IPO filing are preliminary and may change. The valuation, raise amount, and backlog figures are based on the prospectus and press reports, not final pricing. SB Energy’s revenue is tiny compared to its backlog, and its losses are large. The PORTS-Pike project requires regulatory approvals for power plant and transmission construction, which introduces timeline risk. The IPO filing also does not disclose how the neocloud business SB Neo, announced separately by SoftBank, relates to SB Energy’s strategy.

For now, the filing confirms that the AI infrastructure buildout is entering a new phase where energy and compute are being financed together. The question is whether the market will accept that concentration risk at a $50 billion valuation.