A control circuit (30, 130) comprising: first and second terminals (32, 43) for connection to an electrical network (36, 38), a current transmission path extending between the first and second terminals (32, 34), the current transmission path including first and second current transmission path portions (40, 42) connected in parallel between the first and second terminals (32, 34), the first and second current transmission path portions (40, 42) being arranged to permit a current flowing, in use, between the first and second terminals (32, 24) and through the first current transmission path portion to bypass the second current transmission path portion and to permit a current flowing, in use, between the first and second terminals (32, 34) and through the second current transmission path portion to bypass the first current transmission path portion, each current transmission path portion (40, 42) including a respective converter (50a, 50b), each converter (50a, 50b) including at least one module, each module including at least one energy storage device and wherein the first current transmission path portion includes a first power dissipation element, and the second current transmission path portion includes a second power dissipation element; and a controller configured to selectively remove the or each energy storage device from the respective current transmission path portion (40, 42) to cause current to flow from the electrical network through the current transmission path and through the first and second power dissipation elements (44, 46) so as to use the control circuit (30, 130) as an energy removal device to remove excess energy from the electrical network and dissipate power (70, 72) via the first and secondpower dissipation elements (44, 46) in order to regulate the energy level in the electrical network, wherein the controller is configured to selectively remove the or each energy storage device from the respective current transmission path portion (40, 42) to control first and second currents (62, 64) respectively flowing, in use, in the first and second current transmission path portions (40, 42) to simultaneously charge the converter (50a, 50b) of one of the first and second current transmission path portions (40, 42) and discharge the converter (50a, 50b) of the other of the first and second current transmission path portions (40, 42). first and second terminals (32, 43) for connection to an electrical network (36, 38), a current transmission path extending between the first and second terminals (32, 34), the current transmission path including first and second current transmission path portions (40, 42) connected in parallel between the first and second terminals (32, 34), the first and second current transmission path portions (40, 42) being arranged to permit a current flowing, in use, between the first and second terminals (32, 24) and through the first current transmission path portion to bypass the second current transmission path portion and to permit a current flowing, in use, between the first and second terminals (32, 34) and through the second current transmission path portion to bypass the first current transmission path portion, each current transmission path portion (40, 42) including a respective converter (50a, 50b), each converter (50a, 50b) including at least one module, each module including at least one energy storage device and wherein the first current transmission path portion includes a first power dissipation element, and the second current transmission path portion includes a second power dissipation element; and a controller configured to selectively remove the or each energy storage device from the respective current transmission path portion (40, 42) to cause current to flow from the electrical network through the current transmission path and through the first and second power dissipation elements (44, 46) so as to use the control circuit (30, 130) as an energy removal device to remove excess energy from the electrical network and dissipate power (70, 72) via the first and secondpower dissipation elements (44, 46) in order to regulate the energy level in the electrical network, wherein the controller is configured to selectively remove the or each energy storage device from the respective current transmission path portion (40, 42) to control first and second currents (62, 64) respectively flowing, in use, in the first and second current transmission path portions (40, 42) to simultaneously charge the converter (50a, 50b) of one of the first and second current transmission path portions (40, 42) and discharge the converter (50a, 50b) of the other of the first and second current transmission path portions (40, 42).