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Our power plant consists of two frame 5 GE gas turbines running on part load. The load of the units vary from 10 to 13.5 MW /each unit. This week, we have observed fluctuating of MW of both units when the load of GT1 reach 11.5 MW and when we decrease or increase its load, the system become stable. What is the probable cause of this hunting? (Note: we are using distilled fuel oil and all filters are OK.)