The invention concerns an energy storage robot (1, 1') configured to be used to power electric underground equipment (7), the energy storage robot comprising a propulsion system (6) being arranged to move the energy storage robot, an energy storage unit (1...

There is provided an energy accumulation and distribution system. An energy accumulator accumulates waste energy. A first energy interface is adapted for receiving first waste energy to be accumulated from a braking power reserve. A second energy interface...

It is presented a DC-power system (1) comprising a main DC bus (3), a power generating unit (P1, P2, P3, P4) arranged to feed the main DC bus (3), an isolator switch arranged (7) between the main DC bus (3) and the power generating unit (P1, P2, P3, P4) fo...