For CSP systems, SAM displays the ratio of the system's annual AC electric output to the power block's gross electric output. The difference between the two is due to parasitic losses from electric loads in the solar field and power block for pumps, cooling equipment, etc.

Gross to Net Conv Factor = Net Electric Output (kWh) / Gross Electric Output (kWh)

Where Net Electric Output and Gross Electric Output are reported under Single Values in the Tables.