BEIJING (AFX-ASIA) – Guangdong Electric Power Development Co Ltd (SZ A 000539; SZ B 200539) said its net profit dropped 23.84% year-on-year to 559.56 million yuan in the first half to June, largely due to lower electricity prices. (US$1=8.27 yuan). The company said the sharp decrease in profit at its two subsidiaries, whose power transmission…