China's power generation grew 3.3 percent year on year to 2.8 trillion kilowatt hours in the first five months of 2019, official data showed Friday.

In May alone, power generation rose 0.2 percent from one year earlier to 558.9 billion kilowatt hours, down 3.6 percentage points from April, according to the National Bureau of Statistics (NBS).

NBS attributed the slower growth last month to factors such as more days of high temperatures during the same period a year ago.

In breakdown, coal-fired power generation declined 4.9 percent year on year last month, down 4.7 percentage points from that registered in April, while the generation of hydroelectricity and nuclear power posted slower growth by 10.8 percent and 15.4 percent, respectively.

Wind power and solar power generation in May grew faster from a month earlier, up 19.4 percent and 15.5 percent year on year.