ContractCore Screenshots ContractCore Optimize complex contract processes for ISO/RTO and bilateral markets. PPA Invoicing Complex Contract Shadow Contract Management Screenshots Schedule a Demo ContractCore Screenshots (click to enlarge) Go Back ContractCore is used to calculate PPAs, transmission settlements, REC settlements, and all other products that are invoiced down to the lowest available level of granularity. Powerful functionality can send invoice supporting data to customers, validate their invoices, and approve or reject those invoices. ContractCore can also automatically send invoice data to AR/AP systems.