Huaneng Power International Inc.: traded higher by 1.77% or $0.34/share to $19.50. In the past year, the shares have traded as low as $16.25 and as high as $25.83. On average, 149862 shares of HNP exchange hands on a given day and today's volume is recorded at 152082. The shares are currently trading below the 200-day moving average but above the 50-day moving average. The stock may be range bound between these two levels where the 200-day moving average of $21.47 represents resistance and the 50-day moving average of $18.77 would be an area of support.