no application usage statistics
openSuse Leap 15.1, 15.2 , openSuse Argon 15.1
plasma 5.18.2
kde frameworks 5.67.0
kde apps 19.12.2
qt 5.14.1
upower 0.99.7 , 0.99.11
In kinfocenter in "energy information"
For a longtime (2017/11/27) there is no more statistics, only a blank page.
In the past there were statistics about applications energy consumption.
see https://bugs.kde.org/show_bug.cgi?id=387366 , comments about upower