This data includes 7999 different power flow operation scenarios for the 563-bus transmission system, created by the Pacific Northwest National Laboratory (PNNL)'s Sustainable Data Evolution Technology (SDET) project, funded by ARPA-E. The 563-bus transmission system includes 563 buses, 660 branches (lines and transformers), 95 generators, and 442 loads. Each scenario has different load profiles and different generation dispatches, but the system topology and branch parameters are the same. This set of data represents the hourly operation conditions of the system from Jan.1 to Nov. 30.