Total power generation, including coal, rose 12.54% on the year to 3964.3GWh in May, while generation from other renewable sources fell 5.78%.

During the January-May period, its wind farms generated 13,374.1GWh of electricity, down 9.67% from the first five months of 2015, according to a statement to the Hong Kong stock exchange.

Generation from other renewable-energy sources rose 11.61% from January to the end of May, while coal generation fell 5.4%.

In