The most common and most likely answer to this crossword clue is the 29 letter word YESTERNEGIESENERGIES/YESTREEN
Y
E
S
T
E
R
N
E
G
I
E
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N
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G
I
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/
Y
E
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N
Buddy explains!
The straight part
We know that "More than one power supply/last night" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case more than one power supply/last night = yesternegiesenergies/yestreen.The cryptic/wordplay part
In cryptic crossword there's often an wordplay/cryptic part as well.This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
Sadly, We don't have an explanation for this specific crossword clue yet.