The thinking was that we are providing power feedback to aid in RTL development, much in the way synthesis provides timing and area feedback. And you can annotate power consumption back to the RTL. To get going, you'll first want to enable the RTL cross-probing with this attribute
set_attribute hdl_track_filename_row_col true /
Then you need to build the RTL power models. This of course uses your full SDC and utilizes the global synthesis engines so that the estimation is aware of how the logic will be structured and mapped for timing. The command to build the RTL power models is: