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No plant beats the nuclear power plant from efficiency stand point ( up until today ). but of course there are pros and cons to each power generation application . The gas turbine fired combined cycle power plants has improved rapidly in the previous decade . We are now talking about combined cycle efficiency at 62% or higher depending on the technology used. to put an conclusion here , yes a new gas turbine fired power plant would absolutely improve your efficiency
efficiency of simple cycle GT is 36-40 %.
Steam turbine which runs on Waste heat recovered from GT exhaust, Steam cycle efficiency - 30 - 35%
Combined cycle Efficiency = GT effi. + ST Effi - ( GT effi. x ST effi)
= 0.36 + 0.30 - (0.36 x 0.3) = 0.552 or 55 %
clearly we can see, Combined cycle power plant are nearly 20% more efficient than the simple cycle.
