China Longyuan Power's (SHE:001289, HKG:0916) power generation in July fell 2.2% to 6.2 million megawatt-hours from 6.3 million MWh a year earlier, according to a weekend disclosure on the Hong Kong bourse.
The power company's Hong Kong shares rose 1% during Monday's trade.
Wind power dropped 4.9% from a year earlier and solar power rose 6.1% year on year.