That is correct. For the Sub-25 Category, a Bid is a price per REC for a quantity of no fewer than 500 RECs; such RECs may be associated with identified systems, with a forecast quantity, or with a blend of both. For each Bid, all RECs must be offered at the same uniform price.
However, you may name a different price for each Bid subject to the constraint that each Bid is for at least 500 RECs.