Step 1: Analyze the context of the statement.
The statement refers to an acute power shortage, indicating a scarcity of electricity that necessitates a conservative approach to energy use.
Step 2: Determine the most appropriate and logical completion of the sentence.
Option (b), "Resort to use of electricity only when it is inevitable," logically completes the statement as it implies that electricity use will be minimized and only utilized when absolutely necessary, aligning with the context of managing a power shortage.