Methane pyrolysis GHG allocation

Your first case is relatively straightforward.

You use the NG to hydrogen pathway and enter the NG and electricity requirements per GJ on the Input sheet. The carbon co-product is entered on the Coprods sheet in cell D130.

The allocation, energy of mass is set in B185. Mass allocation will assign most of the emissions to the carbon, energy allocation splits the emissions more equally between the hydrogen and the carbon.

To model the blend you would first have to model the RNG. Then the NG and electricity would be input on the Input sheet and the quantity of HNG would be added on the Alt Fuel Prod sheet in cell W85 or 86 depending on the type of RNG. The coproducts would be done the same way as the all NG case.

Regards
Don O'Connor

ISO guidelines do provide a lot of flexibility with respect to which allocation approach to use. There is no one size fits all approach. However I have not heard of using a hybrid approach when there is only one co-product, as would be the case here.

I think that it also depends on the application for the co-product, some applications might be better suited to mass and others to energy.

Regards
Don O'Connor

Yes you could do that.

Regards
Don O'Connor