Aggreko PLC Friday said its earnings will fall short of expectations this year as the U.K.-based temporary power provider reels from impacts ranging from fighting in Yemen to weakening demand from the U.S. shale industry. The company said its full-year pretax profit will fall to between GBP250 million and GBP270 million , compared with analysts' expectations which stood at GBP294 million on average according to Aggreko's website.