A marine environment electrical connection apparatus (1, 101, 201) comprising:- a buoy (1, 101, 201) at least part of which when located in water projects above the surface of the water; at least one mooring point (37, 137, 237) to which a marine vessel (5, 205) can be coupled; and at least one electrical power coupling (29, 129, 229) to which the marine vessel (5, 205) can be coupled, such that electrical power can be transferred via the electrical power coupling (29, 129, 229) between a power generation and/or storage device and the marine vessel (5, 205); wherein the mooring point (37, 137, 237) comprises a mooring line (35, 135, 235), with one end connected to the buoy (1, 101, 201) and another free end provided with a connector (37, 137, 237) adapted for connection to a vessel mooring line (41, 241); wherein the electrical power coupling (29, 129, 229) comprises a flexible electrical cable (25, 125, 225), one end of which is secured to the buoy (1, 101, 201) and another free end of which comprises one of a plug (29, 129, 229) and socket adapted for electrical connection with one of a respective mating socket and plug on the marine vessel (5, 205); wherein the buoy (1, 101, 201) has a body (20, 120, 220) which is adapted to permit paying of the mooring line (35, 135, 235) and the flexible electrical cable (25, 125, 225) away from and toward a portion of the body (20, 120, 220); wherein the mooring line (35, 135, 235) and the flexible electrical cable (25, 125, 225) pay in and out from the body (20, 120, 220), such that the marine environment electrical connection apparatus (1, 101, 201) is transformable between:- a rest configuration in which the respective other free ends of the mooring line (35, 135, 235) and the flexible electrical cable (25, 125, 225) are relatively close to the body (20, 120, 220) and are presented in a position that is clear of the water, in use; and a deployed configuration in which the respective other free ends of the mooring line (35, 135, 235) and the flexible electrical cable (25, 125, 225) are payed out from the body (20, 120, 220) such that the respective other free ends are capable of being made fast to the marine vessel (5, 205); wherein the mooring line (35, 135, 235) and the flexible electrical cable (25, 125, 225) are jointly biased into the rest configuration by a biasing means (27, 127, 227); and characterised in that the biasing means (27, 127, 227) comprises a travelling mass member (27, 127, 227). a buoy (1, 101, 201) at least part of which when located in water projects above the surface of the water; at least one mooring point (37, 137, 237) to which a marine vessel (5, 205) can be coupled; and at least one electrical power coupling (29, 129, 229) to which the marine vessel (5, 205) can be coupled, such that electrical power can be transferred via the electrical power coupling (29, 129, 229) between a power generation and/or storage device and the marine vessel (5, 205); wherein the mooring point (37, 137, 237) comprises a mooring line (35, 135, 235), with one end connected to the buoy (1, 101, 201) and another free end provided with a connector (37, 137, 237) adapted for connection to a vessel mooring line (41, 241); wherein the electrical power coupling (29, 129, 229) comprises a flexible electrical cable (25, 125, 225), one end of which is secured to the buoy (1, 101, 201) and another free end of which comprises one of a plug (29, 129, 229) and socket adapted for electrical connection with one of a respective mating socket and plug on the marine vessel (5, 205); wherein the buoy (1, 101, 201) has a body (20, 120, 220) which is adapted to permit paying of the mooring line (35, 135, 235) and the flexible electrical cable (25, 125, 225) away from and toward a portion of the body (20, 120, 220); wherein the mooring line (35, 135, 235) and the flexible electrical cable (25, 125, 225) pay in and out from the body (20, 120, 220), such that the marine environment electrical connection apparatus (1, 101, 201) is transformable between:- a rest configuration in which the respective other free ends of the mooring line (35, 135, 235) and the flexible electrical cable (25, 125, 225) are relatively close to the body (20, 120, 220) and are presented in a position that is clear of the water, in use; and a deployed configuration in which the respective other free ends of the mooring line (35, 135, 235) and the flexible electrical cable (25, 125, 225) are payed out from the body (20, 120, 220) such that the respective other free ends are capable of being made fast to the marine vessel (5, 205); a rest configuration in which the respective other free ends of the mooring line (35, 135, 235) and the flexible electrical cable (25, 125, 225) are relatively close to the body (20, 120, 220) and are presented in a position that is clear of the water, in use; and a deployed configuration in which the respective other free ends of the mooring line (35, 135, 235) and the flexible electrical cable (25, 125, 225) are payed out from the body (20, 120, 220) such that the respective other free ends are capable of being made fast to the marine vessel (5, 205); wherein the mooring line (35, 135, 235) and the flexible electrical cable (25, 125, 225) are jointly biased into the rest configuration by a biasing means (27, 127, 227); and characterised in that the biasing means (27, 127, 227) comprises a travelling mass member (27, 127, 227).