The surging energy demands of artificial intelligence have ignited a fierce competition to supply the future power grid, with tech giants investing in and signing agreements with next-generation nuclear and renewable energy startups. The race is challenging the dominance of natural gas, which currently supplies 40% of U.S. electricity, as supply chain vulnerabilities and long lead times for new gas turbines create an opening for alternatives.
Small modular nuclear reactors (SMRs), which adapt proven fission technology, are positioning themselves as a direct replacement for natural gas plants. Several companies have aggressive timelines for commercial operation, aiming to connect to the grid within the next five to seven years—roughly the same timeframe as securing parts for a new gas plant.
The SMR Contenders
Kairos Power, with Google as a future customer, is constructing its Hermes 2 demonstration reactor after receiving approval in 2024. Oklo, which merged with a Sam Altman-backed company, targets 2028 for its first commercial operations. Other major players include X-energy (an Amazon investment) aiming for the early 2030s, and Bill Gates' TerraPower (which has a deal with Meta), planning to begin in 2030.
Their success hinges on achieving mass manufacturing to drive down costs. Currently, new nuclear power is among the most expensive forms of new generation at approximately $170 per megawatt-hour, according to financial advisory firm Lazard.
The Fusion Frontier
While less proven than fission, nuclear fusion promises vast power using seawater as fuel and is attracting significant tech investment. Startups are also targeting the early 2030s for first deployments. Commonwealth Fusion Systems plans to start its demonstration reactor next year, with its first 400-megawatt commercial plant, Arc, expected in Virginia in the early 2030s.
Helion Energy, backed by Sam Altman, has the most aggressive timeline, racing to build its first commercial-scale plant, Orion, by 2028 to supply Microsoft. The company is reportedly in talks to supply OpenAI with up to 50 gigawatts by 2035—a scale that would require building 8,000 reactors in a decade and, if achieved, could outpace recent annual U.S. capacity additions from all sources.
The Renewable and Storage Challenge
Both nuclear and natural gas face a potent challenger in renewables paired with advanced batteries. The cost of wind and solar power has plummeted over the last decade. Even without subsidies, solar paired with batteries now ranges from $50 to $130 per megawatt-hour, overlapping with the projected costs of new gas, fission, and fusion plants.
New battery technologies designed specifically for the grid, such as Form Energy's iron-air battery and XL Batteries' organic fluid storage, promise to further slash the cost of long-duration storage by avoiding expensive critical minerals like lithium and cobalt.
The Cost Battle Ahead
The ultimate decider will be cost. New baseload natural gas plants cost about $107 per megawatt-hour, though prices are rising. SMRs must prove they can scale to reduce costs, while fusion faces greater technical and economic unknowns, with some experts predicting initial costs around $150 per megawatt-hour. This sets all three on a potential collision course, with renewables and storage positioned to undercut them if battery prices continue to fall.
The outcome of this energy race will determine the primary power sources for the data-centric economy of the 2030s, with major technology companies actively shaping the landscape through strategic investments and power purchase agreements.