A turbine generator regenerative braking system may be used to slow or stop a rotating shaft or wheel, wherein energy may be recovered as electricity generated by a turbine generator and stored in batteries, ultra-capacitors, or other storage systems. The turbine generator may be fluid-jet powered, the...http://www.google.com/patents/US20060137927?utm_source=gb-gplus-sharePatent US20060137927 - Turbine generator regenerative braking system
