X-Energy (NYSE: XE) made its public market debut in April, immediately drawing comparisons to fellow small modular reactor company Oklo (NYSE: OKLO), which went public via a SPAC merger in May 2024.
X-Energy’s shares surged nearly 20% in the weeks following its IPO, signaling strong investor appetite for the new entrant in the competitive SMR space.
Oklo had previously captured significant market attention thanks to its AI-focused energy ambitions and high-profile backing from OpenAI CEO Sam Altman.
X-Energy arrives with similarly compelling credentials, centering its pitch on AI power demand and drawing support from retail and institutional investors energized by Amazon’s involvement.
Both companies represent a new generation of nuclear energy developers whose reactor designs differ fundamentally from more conventional SMR approaches being pursued by competitors.
NuScale Energy, another SMR developer, is building a reactor that is essentially a scaled-down version of the standard water-cooled systems found in nearly all existing U.S. nuclear power plants.
Oklo’s Aurora Powerhouse takes a markedly different approach, relying on a small-scale fast reactor cooled by liquid sodium rather than water, enabling operation at higher temperatures and lower pressures.
That design advantage, in theory, improves efficiency, and the fast reactor’s ability to maintain fission without slowing neutrons means it can be fueled using spent fuel from existing reactors.
X-Energy’s XE-100 reactor pursues yet another path, using pressurized helium gas as its coolant, which then feeds into a separate water loop to generate steam and drive conventional turbines.
The diverging technical designs mean investors must weigh not just market timing and valuation, but also the long-term viability of each company’s underlying reactor technology as the nuclear energy sector draws increasing capital and political support.
With a nuclear-friendly regulatory environment in Washington and surging electricity demand driven by AI data centers, both Oklo and X-Energy are positioned to attract continued investor interest throughout the year.
The central question for investors is whether Oklo’s first-mover advantage and established profile outweigh the fresh momentum and strategic partnerships that X-Energy is rapidly building after its market debut.
