Big Solar Panel Makers Boosting Production as Costs Fall (2)

Several big solar-panel makers are ramping up production in a boon to clean energy. A key reason: the collapse of material costs that had been elevated for more than a year.

Three leading Chinese module manufacturers are bumping up January output forecasts, according to Shanghai Metals Market, which didn’t identify its sources. Promising near-term demand is another factor driving the output boost.

JA Solar Technology Co. has a more positive expectation for the solar market this quarter than previously, the company said in a WeChat message, though didn’t specify if it would raise production. Major competitors Longi Green Energy ...