After consideration of take or pay contract and grid/system stability, PLN is required to prioritize the cheapest option of electrons in deciding its merit order as stated in its grid code. By revealing the true cost of coal in its energy use, theoretically, PLN would have to prioritize renewable sources that are cheaper than fossil fuel in general. This would be the targeted impact for PLN decision making.

It is important, however, that the policy decision will not create negative impact to the customers if there is any price increase in PLN’s cost of generation. Therefore, PLN should be compensated through a windfall profit mechanism, to keep electricity prices affordable for the customers. 

For more explanation, refer to Sub-Chapter 8.2.