Additionality means "does this purchase of clean/green energy increase the total amount on the grid or does it just take it from other users who are now associa

Additionality means "does this purchase of clean/green energy increase the total amount on the grid or does it just take it from other users who are now associated with the emissions of the non-clean energy". Or more broadly "the extent to which something happens as a result of an intervention that would not have occurred in the absence of the intervention."