Huadian Power International Group, the third-largest Hong Kong-listed Chinese power producer by capacity, posted a 15 percent year-on-year increase in its first-half net profit of 536 million yuan (67.2 million US dollars), boosted by strong energy demands, The Wall Street Journal reported. The company’s revenue increased to 7.12 billion yuan (890 million US dollars). The paper quoted Analysts saying that first-half earnings would have been driven by new capacity, higher tariffs and China's strong demand for electricity, as was the case with other power producers in the country. Power producers in China have rushed to build new plants in recent years. Their earnings have been hurt by high coal costs, but Beijing has raised domestic electricity prices twice since it introduced a mechanism last year that pegs power prices to the market price of coal. The most recent electricity-price increase was in late June.