Power network (4)
I believe the answer is:
grid
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">power network</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for grid that I've seen before include "frame" , "a network of squares as in this puzzle" , "Bars used to make one" , "River at Nottingham" , "Framework of crossing lines" .)