We're building 50 MW natural gas turbines, engineered for American manufacturing with the speed and scale the grid actually needs.
We're not reinventing the turbine. We're reinventing how it's designed and built.
The world needs 1.5 to 2 terawatts of new firm power this decade, and neither the turbines nor the factories to build them exist yet. The industry calls this a supply-chain problem. It's really a manufacturing problem, and it's the one Stone was built to solve.
The heavy-duty gas turbine hasn't been designed from a clean sheet in a generation. The industry scales old machines and swaps materials, and calls it progress. We're building the engine that designs and manufactures new turbines from scratch: an agentic design loop that compresses a 5 to 8 year cycle into months, with test, manufacturing, and reliability data feeding back into every iteration. It's what a new generation of hardware companies brought to rockets, drones, and satellites, now pointed at power generation.
We reserve vertical integration for where it moves the needle and optimize relentlessly for simplicity. The goal is gigawatts at scale, not the perfect machine. The best part is no part.
This is how you build one turbine. It's also how you build the next dozen, for new reactors, new fuels, and new applications the grid doesn't even have names for yet. Stone is the company that can go from clean sheet to delivered turbine, on repeat.
Natural gas first. Steam, geothermal (ORC), advanced cycles, and propulsion next.
The next dozen turbines arrive in an order, not all at once. Natural gas comes first because the cycle is proven, the demand is immediate, and the manufacturing floor only gets built right when it's engineered around a real, shippable product. Steam turbines for advanced reactors, organic Rankine for geothermal, and supercritical CO2 follow, with propulsion behind them.
We don't have to bet on any single advanced cycle to win, because roughly 80% of the factory steps carry over no matter the heat source. A turbine is a turbine is a turbine: designed by the same team, on the same software stack, built on the same lines. The design engine and the factory are what we're really building, and they compound with every cycle we add. Each new technology is a new line, not a new company. That is how Stone goes from clean sheet to delivered turbine, on repeat, and serves whatever the grid needs next.
[Caption example: Schematic of a natural gas turbine. Label items 1-5 in schematic.]
A small group of the few hundred heavy-duty turbomachinery engineers on earth, paired with build talent that has shipped on the most demanding hardware programs of the last decade. Decades each in industrial gas turbines, combustion, aerodynamics, and rotating machinery.
Building the next generation of generation. Power up with Stone.