I would like to give some feedback about ...

From: https://py.checkio.org/mission/power-supply/solve/

The second argument of the main function is power plants (that contains the range of all the power plants) but the test case 2/2 of category 'Extras' is giving the range of a city instead of the range of the powers plants. This does not follow the description of the mission and that is the reason I think it could be a bug.