Emergency power system with energy storage device

A ram air turbine (RAT) system, comprising:

• a main generator;
• a RAT power generation unit;
• first circuitry by which the main generator and the RAT power generation unit are connectable to a first aircraft bus, the first circuitry comprising a first switch which is controllable such that power is provided to the first aircraft bus from one of the main generator and the RAT power generation unit;
• a storage device;
• and
• second circuitry by which the storage device is connectable to a second aircraft bus, the second circuitry comprising a second switch which is controllable such that power is provided to the second aircraft bus from the storage device.

A ram air turbine (RAT) system, comprising:

• a main generator;
• a RAT power generation unit;
• a storage device;
• first circuitry by which the main generator and the storage device are connectable to a first aircraft bus, the first circuitry comprising a first switch which is controllable such that power is provided to the first aircraft bus from one of the main generator and the storage device;
• second circuitry by which the electrical storage device is connectable to a second aircraft bus, the second circuitry comprising a second switch which is controllable such that power is provided to the second aircraft bus from the storage device;
• and
• third circuitry by which the RAT power generation unit is connectable to the storage device.