Naming a Guarantor is not required but is an option that is offered to each Seller. If you wish to rely on the financial standing of another entity for purposes of the REC Contract, if this entity meets the minimum rating, then this entity is a Guarantor, and the Guarantor may provide a Guaranty to meet some or all of the Collateral Requirement under the REC Contract.  Alternatively, the Collateral Requirement may be met with cash or with a Letter of Credit.