Power systems developer Rolls-Royce has won a contract to supply its Trent units to existing customer Dolphin Energy.Under the terms of the $136m contract, Rolls-Royce will supply Dolphin Energy, a company which transports natural gas from Qatar to the United Arab Emirates and Oman via a 364 kilometres sub-sea pipeline, with three industrial Trent gas turbine compression packages. The three new Trent units, each rated at 52 megawatts, will join six similar Rolls-Royce packages that went into service at Dolphin Energy's Gas Processing Plant in Ras Laffan, Qatar in 2006.Dolphin has also signed up for Rolls-Royce's TotalCare long term equipment service package.Delivery of the packaged units to Ras Laffan will be in the second and third quarters of 2013. JH