Hong Kong stocks rallied today morning, boosted by a surge in energy firms after the Opec Oil cartel agreed a plan to cut production, sending crude prices soaring. The Hang Seng Index climbed 0.48 percent to 23,731.97 points by the break. The Benchmark Shanghai Composite Index added 0.56 percent to 3,004.64 points and the Shenzhen Composite Index, which tracks stocks on china’s second exchange, climbed 0.65 percent to 1,991.08 points.