Sources of clean energy generated 106.8 billion kilowatt-hours of electricity in July, up 31 percent from a year ago, according to figures released by the State Electricity Regulatory Commission (SERC) Tuesday.

During the first seven months, sources of clean energy generated 505.5 billion kilowatt-hours of electricity, accounting for 18.4 percent of total on-grid power, up 1.9 percentage points year on year.

In July, wind-generated electricity grew 56.7 percent, marking the fastest growth pace, followed by hydro-power electricity, which expanded by 33.9 percent.

In the January-July period, electricity from wind power, hydropower and nuclear power increased by 29.7 percent, 15.6 percent and 15.3 percent, respectively.

By the end of July, hydropower generation capacity increased by 6.1 percent year on year to 202.63 million kilowatts. Nuclear power generation capacity added 16.2 percent to 12.57 million kilowatts. Wind power generation capacity stood at 53.81 million kilowatts, up 37.1 percent.