Some Motor Controllers can provide braking by means of Regenerative Braking instead of dissipating energy in a Braking Resistor. An inverter in the motor controller feeds electrical power back into the electrical grid. Has anyone got experience of programming a Motor Controller in regenerative braking mode ? I am particularly interested in varying the braking torque to vary the speed of the generator driven by the hydro turbine (Kaplan). Can anyone recommend a 200 kW motor controller with regenerative braking and a programmable front end to control the torque on the motor / generator ? Supplementary question: how do motor controllers with regenerative braking handle network failure while braking ? Do they have anti-islanding capabilities to protect network workers ? – or is external anti-islanding equipment required ? If so, can anyone recommend such equipment ?