Dec 17 (Reuters) - China’s state planner said on Thursday power supply capacity was “generally sufficient” after cold temperatures in southern regions brought a spike in demand and restrictions on usage, the official Xinhua news agency reported. Electricity supply in the inland provinces of Hunan and Jiangxi has been tight and the coastal province of Zhejiang has also restricted power consumption, Xinhua said. A rapid increase in industrial production and cold weather in December have led to “faster-than-expected growth in power demand,” it cited the National Development and Reform Commission (NDRC) as saying. China’s power consumption in November was up 9.4% year-on-year at 646.7 billion kilowatt hours, according to the National Energy Administration, underscoring the rebound in industrial activity following the coronavirus outbreak. Residential power consumption has not been affected during the cold snap, the NDRC said, according to Xinhua, adding it had taken steps, in conjunction with the relevant departments and enterprises, to ensure power demand is met. In Zhejiang, a manufacturing hub, provincial government agencies were this week told they could not turn on air conditioners or other heating equipment unless temperatures fell below 3 degrees Celsius, state-run The Paper reported. The temperature in provincial capital Hangzhou was 7 degrees Celsius on Thursday evening, according to the China Meteorological Administration. (Reporting by Tom Daly and Stella Qiu; Editing by Mark Potter)