Do I need to worry about how the REC purchase transaction works?

Generally, the REC transfer will happen automatically and your Approved Vendor will take care of the details between it and the utility that purchases the RECs. The REC payments may affect the economic terms of your installation transaction, however; you should discuss that with your installer and/or Approved Vendor. As always, feel free to shop around and consider carefully among installers and/or Approved Vendors before making a final decision.