Prescribing Ramp up and Ramp down rates for thermal power generation capacities

[Antti-L]

Sorry, it is not possible to suggest what could be the reason with so little information.

Could you post the listing file (*.lst) from the model run, to see some details about your TIMES version?
Could you also post the result data (activity & capacity) that demonstrate the 20 to 30% ramping rates?

Thanks.