Synthetic intelligence has despatched demand for electrical energy skyrocketing within the U.S. after years of just about zero development. That has despatched Massive Tech corporations scrambling to safe producing capability for his or her knowledge facilities.
For a lot of, that has meant turning to nuclear fission. The ability supply has been experiencing a resurgence in the previous few years following a long time of plant closures. (Fission, utilized in all present nuclear vegetation, is distinct from fusion, the still-experimental method to getting energy from atoms that, whereas attracting buyers, has but to provide extra electrical energy than it consumes.)
For tech corporations, a part of the attraction of fission is a secure, predictable supply of energy that flows 24/7, giving their knowledge facilities the potential to run computing masses at any time when they require it.
However one other a part of the attraction lies in new reactor designs that promise to beat the shortcomings of present nuclear energy vegetation. The place outdated energy vegetation have been constructed round huge reactors that would generate over 1 gigawatt of electrical energy, new small modular reactor (SMR) designs see a number of modules deployed alongside one another to fulfill a variety of wants.
SMRs depend on mass manufacturing to carry prices down, however so far, nobody has constructed one within the U.S. Nonetheless, that hasn’t saved Amazon, Google, Meta, and Microsoft away from the desk. They’ve both signed agreements to purchase energy from nuclear startups or invested in them straight — or each.
Listed below are the nuclear fission startups backed by Massive Tech.
Kairos Energy
Kairos Energy obtained a vote of confidence from Google when the search big promised to purchase round 500 megawatts of electrical energy by 2035, with the primary reactor focused to come back on-line by 2030.
The corporate’s small modular reactors depend on molten fluoride salt for cooling and to move warmth to a steam turbine. The salt’s excessive boiling level signifies that the coolant doesn’t must be saved at excessive strain, which ought to enhance working security. The reactors include gas pebbles coated in carbon and ceramic shells, which must be robust sufficient to face up to a meltdown.
The Alameda-based startup has obtained a $629 million award from the U.S. authorities, together with $303 million from the Division of Power. In November 2024, Kairos obtained approval from the U.S. Nuclear Regulatory Fee to begin building on two reactors in Tennessee. At 35 megawatts, the take a look at models can be smaller than Kairos’ eventual business reactors, that are anticipated to generate 75 megawatts every.
Oklo
Oklo is one other SMR firm focusing on the info heart world — no shock provided that it was backed by OpenAI CEO Sam Altman, who additionally took the nuclear startup public through a reverse merger together with his particular goal acquisition car, AltC, in July 2023. Altman served as chairman of Oklo till April, when he stepped down as OpenAI started negotiating with Oklo for an power provide settlement. DCVC, Draper Associates, and Peter Thiel’s Mithril Capital Administration are among the many startup’s earlier buyers.
Cooled by liquid metallic, Oklo’s reactor relies on an present U.S. Division of Power design that’s supposed to scale back the quantity of nuclear waste that outcomes from common operations. Nonetheless, Oklo’s path hasn’t been a easy one. The corporate’s first license software was denied in January 2022. Oklo has mentioned it’ll resubmit the applying someday in 2025. However that hasn’t stopped the corporate from touchdown a deal to produce knowledge heart operator Change with 12 gigawatts by 2044.
Saltfoss
Like Kairos, Saltfoss, previously generally known as Seaborg, additionally needs to construct SMRs cooled by molten salt. However not like Kairos and others, it envisions inserting two to eight of them on a ship to create what it calls a Energy Barge. The startup has raised practically $60 million, together with a $6 million seed spherical that included investments from Invoice Gates, Peter Thiel, and Unity co-founder David Helgason, in keeping with PitchBook. Satlfoss has an settlement with Samsung Heavy Industries to construct the ships and the Satlfoss-designed reactors.
TerraPower
Based by Invoice Gates, TerraPower is constructing a bigger reactor, known as Natrium, which is cooled by liquid sodium and options molten salt power storage.
The corporate broke floor on the primary energy plant in June 2024 in Wyoming. The Natrium design requires the reactor to generate 345 megawatts of electrical energy. That’s smaller than different new nuclear vegetation right now however bigger than most SMR designs.
However Natrium has a trick up its sleeve with its molten salt warmth storage system. Since nuclear reactors function greatest at a gradual state, the Natrium reactor can proceed breaking atoms when demand is low, and the additional power is saved as warmth in a vat of molten salt, which will be drawn upon later to generate electrical energy.
Traders embody Gates’ Cascade Funding fund, Khosla Ventures, CRV, and ArcelorMittal.
X-Power
X-Power landed a hefty $700 million Collection C-1 final yr led by Amazon’s Local weather Pledge Fund. On the similar time, the SMR startup introduced two growth agreements that will see the deployment of 300 megawatts of recent nuclear producing capability within the Pacific Northwest and Virginia.
The corporate’s high-temperature, gas-cooled reactors buck latest developments within the U.S. and Europe, the place the design has been shunned in favor of different approaches. The corporate’s Xe-100 reactor is predicted to generate 80 megawatts of electrical energy. Helium fuel flows via the reactor’s 200,000 billiard ball-sized gas “pebbles,” absorbing warmth to spin a steam turbine.
