Thank you for sending the file. I will start with your original question about the difference between the "Net Annual Energy" value reported in the metrics table, and the sum of the monthly "Net Electric Output" values shown in either the Data Tables or the Monthly Output graph. I will answer your question about energy payment allocation factors in a separate reply.
The two values differ by the availability factor that you specify on the Annual Performance page:
The net annual energy value is 139,749,903 kWh:
The monthly net energy values are:
The availability factor is 96%:
The sum of the monthly values is 145,572,700 kWh, and 96% of that value is 139,749,792 kWh, which is equal to the net annual energy value:
Best regards,
Paul.