Fluence Energy (FLNC) saw its stock surge approximately 31% in early Nasdaq trading on Monday, reaching $24.80 after being named a key partner in a new AI data center power architecture unveiled by Siemens and Nvidia. The rally underscores the growing intersection between energy storage and the booming AI infrastructure market.
The reference design, which targets a 136-megawatt facility capable of supporting a 100-megawatt IT load, places Fluence's battery energy storage systems (BESS) at the center of the electrical layout. Siemens said the architecture is aimed at hyperscalers, colocation providers, and cloud infrastructure firms racing to deploy high-density AI sites faster. The design follows the electrical path from a 34.5-kilovolt utility connection through distribution down to the rack level, integrating Fluence's Smartstack BESS to manage voltage and frequency fluctuations, provide black-start support, and handle the variable power demands of AI workloads.
Jeff Monday, Fluence's chief growth officer, stated in the Siemens release that Smartstack is 'central to this new architecture' and will enable customers to build AI factories 'faster and more reliably.' The announcement builds on a strong run for Fluence, which earlier in May reported a record backlog of $5.6 billion as of March 31 and disclosed it had signed master supply agreements with two hyperscalers. Master supply agreements are framework contracts that set terms but do not guarantee final volumes.
Fluence's second-quarter earnings, released in May, showed revenue of $464.9 million, up 7.7% year over year. The net loss narrowed to $29.2 million from $41.9 million in the prior-year period, while adjusted EBITDA remained negative at minus $9.4 million, though improved from a year ago. The company also reported year-to-date order intake of approximately $2.0 billion through May 6, driven by the hyperscaler deals.
CEO Julian Nebreda said during the earnings call that the company was seeing 'an acceleration of orders' and that customer expansion was 'gaining momentum.' He also expressed confidence that Fluence's first hyperscaler order would convert soon. Analysts have taken note. Jefferies analyst Julien Dumoulin-Smith described the hyperscaler agreements as 'significant progress' for Fluence's data-center strategy, noting that they came sooner than expected and could represent a meaningful portion of Fluence's roughly 12 GWh pipeline.
The broader market context is favorable for Fluence. As AI expansion increasingly shifts focus from chips to power, companies like Fluence that provide grid-scale energy storage are seen as critical enablers. The Siemens-Nvidia reference design is a non-binding blueprint, meaning it stops short of a purchase order. However, it signals strong industry validation and could pave the way for future contracts. Fluence still needs to convert these design wins and agreements into booked business, shipments, and real margin improvement.
In the same session, Nvidia shares gained 3.9%, and nVent, another partner in the Siemens design, rose 1.9%. Meanwhile, NextPower, which announced on May 28 its intention to acquire Prevalon Energy for up to $365 million in a move targeting battery storage and AI data-center projects, saw its shares drop about 6.3% in early trading after a rally on Friday. Bloom Energy, another player in the data-center power space, slipped roughly 3.0%.
For Fluence, the challenge now is to prove it can move beyond being a volatile clean-energy play and establish itself as a reliable part of the AI infrastructure supply chain. The story is simpler than what the sector faced last year, but the expectations are higher, and investors want to see tangible conversion of design wins and agreements into profitable revenue.
