IFP-27: Is it possible for a Seller to be awarded only of portion of the RECs that were bid for a Project? If so, is the Seller required to accept the award?

Projects will be selected on the basis of price. In the example you provide, the lowest and the second lowest priced projects would be selected. The second lowest priced project would win only a portion of the RECs bid.  If the results are approved by the Commission, the Bidder would have the option to accept or reject the partial award.