China’s Beijing Datang Power Generation Company Limited (HKEx: 991; LSE:DAT; ADR:BJDHY) said its plants generated 18.056 billion kWh of electricity, an increase of 28.68% over the same period last year. The company’s total on-grid power generation rose 29.8% to 16.942 billion kWh. It said that demand for electricity in the Beijing-Tianjin-Tangshan region increased by 15.49%…