Second, a volume mechanism: even the cost-optimal procurement strategy for 24/7 hourly matching might include some amount of excess clean energy. If total CFE generation of assets procured by 24/7 participants exceeds demand in a given hour, the “excess CFE”is not counted towards a CFE target; however, it is clean electricity that can potentially be stored (using batteries or LDES), or sold to the regional grid. As for the latter, excess CFE might displace emitting grid generators or reduce the need to import electricity from neighbouring areas.
And this is the second mechanism, volume - basically, when your generation exceeds your own consumption, you are able to export it to the grid, which contributes to a temporary surplus of clean, cheap energy available the wider system that can be then "banked" by other users in their storage to use for later, or allow them to shape their own consumption to take advantage of the lower prices.