Power utility Synergy has taken a $446 million impairment and reported a loss of $656.9 million in the year to June, which the state government-owned business said was driven by higher fixed costs as revenue fell.

Power utility Synergy has taken a $446 million impairment and reported a loss of $656.9 million in the year to June, which the state government-owned business said was driven by higher fixed costs as revenue fell.