Baseload & Firm Supply

Baseload is the steady demand a grid always carries; firm clean sources like fusion can serve it without combustion.

Baseload is the continuous minimum level of electricity demand a grid experiences around the clock — the load that never goes away. Serving it economically and reliably has traditionally meant running steady, high-capacity-factor plants continuously. Coal and fission have filled this role; fusion is designed to serve steady demand cleanly.

Baseload in a modern grid

The concept of pure baseload is evolving as flexible resources and renewables reshape demand patterns, but the underlying need for reliable round-the-clock supply remains. A firm clean source that runs continuously provides a low-carbon foundation on top of which variable renewables and storage layer their contributions. Fusion's steady, firm design fits this foundational role.

Honest framing

Kronos does not claim fusion is the only way to serve baseload, nor that baseload must be met by any single technology. The defensible point is that steady demand needs firm supply, and fusion is designed to provide it cleanly — replacing the combustion sources that serve baseload today rather than the renewables layered on top. As always, this is a design objective; the machines are not yet operating.

• Baseload is the steady, always-present component of demand.
• It needs firm, continuous supply to serve reliably.
• Combustion serves baseload today but emits carbon.
• Fusion is designed to serve steady demand cleanly and firmly.

Design-and-simulation framing. The Kronos machines are today design and simulation studies: the breeder (Hyperion) and the burner (Aegis / MetroVolt). No hardware net-gain has been demonstrated. Breeder construction is planned to begin Q2 2027, with first-of-a-kind (FOAK) first tritium targeted around 2030. Comparisons on this page are qualitative and use only public, defensible figures; nothing here is a performance guarantee.

Firm clean baseload is a role fusion shares with fission and geothermal — the clean foundation beneath a variable-renewable grid.