W&S-90: Please confirm that there will be Collateral Requirement due prior to June 1, 2019 (the earliest that the Delivery Term can start).

Confirmed. The Collateral Requirement due before June 1, 2019 is 50% of the Annual Contract Value from the effective date of the REC Contract and will increase to 100% of the Annual Contract Value on June 1, 2019. The Annual Contract Value is the purchase price multiplied by the annual quantity specified in Table 1 of the REC Contract.