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By Webster A. G.

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When the Frame 9F was first announced, it was as a gas turbine specifically for combined-cycle applications. As such, it would achieve an efficiency of 55% compared with 52% which was being reported by operators of the combined cycles then coming into service in the UK and elsewhere. Marketing in Europe and Asia was with GEC Alstom and almost 30 gas turbines were in effect ordered off the drawing board before Keadby went into operation. By then, GE had announced upgraded versions of both machines as Frame 7FA and Frame 9FA.

It was an initial move to deregulate the electricity supply industry and to encourage the deployment of combined heat and power schemes in industry that carried the gas turbine industry forward in the USA, but there was still little interest in combined-cycle design being shown in Europe. The Public Utilities Regulatory Powers Act (PURPA) of 1979 was a measure introduced by the Carter Administration to promote economy in energy production through combined heat and power. Under the Act, any operator was able to sell electricity to their local public utility at the market price from a combined heat and power plant but, to do this, a prospective operator had to find a qualifying steam host in order that the plant could be licensed and built.

They also set up an outdoor stand for the smaller GT8C2, feeding into the same busbar. Only one of the gas turbines can be operated at a time. Both engines are permanent units used for testing components and major design improvements. Just as the switch to annular combustion systems allowed the European manufacturers to develop more powerful designs running at higher temperatures, so the American manufacturers with their can–annular combustion systems moved to steam cooling to reduce the cooling air requirements.

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