The only way to draw power from this turbine would be to convert the kinetic energy from it's rotating mass(turbine blades, shaft, and generator rotor) to electrical energy. Every joule that comes out of the rotating energy and goes to electrical energy means there's less rotating energy and hence less speed in the turbine, until there's no energy left and the turbine is stopped.
When an electrical generator is loaded at it's electrical terminals(this happens whenever we use power from the generator) it results in a mechanical load at its input shaft. In the case of a turbine, a mechanical load at the shaft means the turbine slows down unless it is kept at speed by another force. In space there is no force to keep the turbine from slowing down. On the surface of the Earth, the wind(or water or steam exhaust gases depending on the application) keeps the turbine spinning even when its loaded.
But there's a law in physics called 'conservation of energy', which states that energy is neither created nor destroyed, just converted from one form to another. And to my knowledge, it has not yet been discovered to be violated.