The card is strongest when it is tied to an explicit trigger, such as carbon intensity, time window, or batch size threshold. That makes the operational goal visible to the team instead of leaving it as a vague aspiration.
If the workload is allowed to run at any time, the environmental benefit becomes incidental. Treat the scheduling rule as part of the definition of done so the energy decision is made where the work is planned.
For this client, start with one non-interactive job and document the grid or battery condition that justifies delaying it.