Curtailment showing as zero-revenue grid sales

[zolanaj]

In some cases, results exhibit grid exports at zero revenue instead of curtailment when the latter is the appropriate results.

The proposed fix is to fix dvProductionToGrid=0 in any period-tier pairing in which the 'cost' (a negative number to indicate a benefit) is equal to zero.

[adfarth]

@Bill-Becker Daniel had mentioned the other day that you two were working on a project in which it would be beneficial to have exports without compensation, to account for the emissions offset. Should we discuss this behavior as a group?

[Bill-Becker]

@adfarth @zolanaj we were using a previous version of REopt.jl, before the Big M implementation, and we WERE seeing curtailment instead of zero-value export. We did not do anything to change this. Our workaround was just to assign a smaller value to the wholesale/export rate. So it seems like maybe the Big M updates now allow export at zero value instead of curtailment?