Dispatchable generation
Generation an operator can instruct up or down on demand, which is what makes a grid controllable rather than merely supplied.
Dispatchable generation is any resource a system operator can call on at a chosen time and output level: gas turbines, hydro with storage, nuclear within its operating envelope, batteries within their duration, and demand that has agreed to be reduced. What defines it is controllability, not fuel or emissions.
A grid needs enough of it to meet demand at the moments variable resources are not producing, and the requirement is set by the worst coincidence rather than by the average - a still, overcast evening at high load. That is why adding variable capacity does not automatically reduce the need for dispatchable capacity, and why firm power commitments are written against dispatchable resources or against contracts backed by them.
The distinction is becoming a procurement question rather than a policy one. A compute buyer signing for round-the-clock supply is buying controllability, and the assets that provide it - including small modular reactors - carry supply chains and lead times of their own that decide when the contract can actually be honoured.
Evidence that keeps pace with the decision.
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