This guide will be a complement to IEEE standard 125 by providing application details and the impact of plant and system features upon hydroelectric governing performance. There is a heightened awareness within the electric utility industry of the importance in the effective application of governing systems for dynamic stability. The need exists to provide guidance in the effective governing system application for a better understanding among users. Present standards do no adequately address this need. This standard will provide the guidance for the design and application of hydroelectric turbine governing systems. New IEEE Standard - Superseded. This guide is intended to complement IEEE Std 125-1988TM, providing application details and addressing the impact of plant and system features upon hydroelectric unit governing performance. It provides guidance for the design and application of hydroelectric turbine governing systems. There is a heightened awareness within the electric utility industry of the importance in the effective application of governing systems for dynamic stability. The need exists to provide guidance in the effective governing system application for a better understanding among users.