Natural-gas futures rose for the fifth straight session, driven by expectations that a heat wave along the East Coast in the coming days could drive power plant demand to generate electricity for air conditioning. The front-month June natural gas contract rose 4.5 cents, or 1.6%, to settle at $2.821 a million British thermal units on the New York Mercantile Exchange. It was the market’s highest settlement since March 18. Prices have gained more than 13% since setting a new 52-week low just a week ago. Weather forecasts say the Northeast and Eastern Seaboard are set to be hit with much-above normal temperatures until the middle of the month, before settling back to more seasonal levels in the second half. With more power plants switching to natural gas as a source fuel for generation, that could mean a spike in gas demand as people run air conditioners […]