Could we harness energy from Earth movement relative to physical vacuum? Earth is moving around Sun with speed of 30 km/sec. Also there exist force of Casimir and similar effects. If we have some body (for example a ball) which is moving in some media (for example water) then to harness energy from such movement we need to build a turbine on the ball wich would be able to interact with water and rotate around its own axle. What could be such analog of a turbine which would be able to interact with physical vacuum?