Selling it at a "loss" (ie; lower-than-market rates), is not a net loss, it just means we haven't made as much money on it as we could've.
No. That would be selling it at a discount. Selling it at a loss implicitly means that the revenue generated is less than the cost to produce it. We have been paying to have others consume our power at times. In no way can negative revenue be anything other than a net loss.