China's output of ferroalloys rose an unexpected 8.3 percent in October to a 2009 peak, ahead of November power price hikes.

"I guess that some ferroalloy producers increased their operating rates before November when power prices haven't been lifted," according to Zhang Zengchan, assistant to the president at the China Ferroalloys Industry Association (CFIA).

However, ferroalloys output is set to fall in November due to weaker demand from the...