A system for extracting geothermal heat energy comprising: • a passive geothermal well in surrounding crust material, the passive geothermal well extending in a first direction from a well top part starting at a well top level at the crust material surface down to a well bottom part more distant from the crust material surface ending at a well bottom level, the well bottom part being at a depth where the surrounding crust material has geothermal temperatures elevated above temperatures at the crust material surface, the geothermal well comprising a geothermal well wall delimiting the geothermal well from the surrounding crust material, • a heat pipe comprised within the passive geothermal well, the heat pipe extending in a first direction from a heat pipe top part starting at a heat pipe top level down to a heat pipe bottom part ending at a heat pipe bottom level, the heat pipe comprising a heat pipe wall delimiting the heat pipe from its surroundings and wherein the heat pipe further comprises a heat medium (9,10) contained within the heat pipe walls, the heat medium being heated at the heat pipe bottom part by heat extracted from the surrounding crust material, decreasing in density and rising, passively carrying heat energy towards the heat pipe top level, and wherein the heat pipe wall is made out of a first heat conductive material, • a heat extractor, extracting the heat energy available at the well top part, wherein at least one heat conductive path is provided in the surrounding crust material, the heat conductive path extending outwardly from the geothermal well into the crust material to conduct geothermal heat from the crust material surrounding the path towards the geothermal well bottom part, wherein the at least one heat conductive path is filled with a second heat conductive material, characterised in that the heat pipe is provided with a wick along the heat pipe sidewalls and the second heat conductive material residing in the heat conductive path is a solid. • a passive geothermal well in surrounding crust material, the passive geothermal well extending in a first direction from a well top part starting at a well top level at the crust material surface down to a well bottom part more distant from the crust material surface ending at a well bottom level, the well bottom part being at a depth where the surrounding crust material has geothermal temperatures elevated above temperatures at the crust material surface, the geothermal well comprising a geothermal well wall delimiting the geothermal well from the surrounding crust material, • a heat pipe comprised within the passive geothermal well, the heat pipe extending in a first direction from a heat pipe top part starting at a heat pipe top level down to a heat pipe bottom part ending at a heat pipe bottom level, the heat pipe comprising a heat pipe wall delimiting the heat pipe from its surroundings and wherein the heat pipe further comprises a heat medium (9,10) contained within the heat pipe walls, the heat medium being heated at the heat pipe bottom part by heat extracted from the surrounding crust material, decreasing in density and rising, passively carrying heat energy towards the heat pipe top level, and wherein the heat pipe wall is made out of a first heat conductive material, • a heat extractor, extracting the heat energy available at the well top part,