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The output of an ABB-13E2 gas turbine installed in Malaysia seems to fluctuate randomly by +/- 1.5 MW on short time scales. Output goes from 141 MW to 144 MW and back to 141 MW is about 20 seconds. This is about +/- 1% of output. Can fluctuations this large and rapid be real or are they instrumentation error? If they are real, what is the mostly likely cause? Can grid frequency vary plus/minus 1% on short time scales?