Nationwide wind power generation spiked 33.6% on the year in January to 2.16 million MWh, the number-one Chinese wind owner said in a filing to the Hong Kong Stock Exchange.

Curtailment, which has bedevilled the country's wind sector in recent years, likely kept as much as 11GW of turbines in China from producing full power in 2013, costing operators roughly $1.6bn