Has the Boeing 787 an emergency generator (RAT) capability in case of both engine failures?

In light of the current problems with batteries being experienced with the Boeing 787 Dreamliner – which has no hydraulics – I am wondering if you know whether the Dreamliner is equipped with an electrical generator equivalent to the Ram Air Turbine system (RAT) you described for getting emergency hydraulics when the engines fail in flight. (aviationsquad.com) Plus d'info...