The issues of transient stability and gas engine power control in electric system with large part of induction melting furnace are considered in the paper. It is shown that autonomous (island) operation in such conditions does not satisfy the requirements of power quality standards. Parallel operation with large-scale power system allows to damp the fluctuation of induction melting furnace power, since gas engine frequency control works out with slow load oscillations only, e.g. induction motor starts.