The nation's electricity (5)
I believe the answer is:
power
I believe this clue is a double definition.
'the nation's' is the first definition.
(power is a kind of nation)
'electricity' is the second definition.
(I know that electricity can be written as power)
(Other definitions for power that I've seen before include "Ability to act or physical might" , "The ability to make" , "Physical force, ability" , "Large amount" , "What may be measured in watts" .)