BUZZ — Huaneng Power slips most in 8 weeks after reporting lower electricity sold
* Hong Kong shares of Huaneng Power International fall 3.9% to HK$6.08, on course for biggest one-day pct drop since August 19 * Stock on track to snap three straight sessions of gains * Shanghai-listed stock slips 2.2% to 7.42 yuan after two straight sessions of gains * Chinese power generation group says electricity