A turbine generator assembly for generating power from a fluid flow, the assembly comprising: a housing for directing fluid flow, a turbine generator having a longitudinal axis of extension, enclosed in said housing, the longitudinal axis being aligned with the direction of fluid flow through the housing and turbine generator, the turbine housing having a transversal axis perpendicular to the longitudinal axis, said turbine generator comprising: a plurality of blades provided on a central rotational axis being parallel with the longitudinal axis, a rotor, and a stator arranged peripherally and annular to the rotor; at least one of the plurality of blades being provided in fixed arrangement with the rotor, and wherein the stator of the turbine generator comprises a plurality of segments each having a coil length parallel to the longitudinal axis of the turbine generator, and a radial coil thickness, wherein at least two stator segments have different coil lengths and/or thickness to each other, wherein the housing has a substantially cylindrical geometry along the transversal axis such that is receivable in a cylindrical bore, and wherein, a lateral region of the stator comprises at least one stator segment having at least one coil of a first coil length, and wherein a transverse region of the stator comprises at least one stator segment having at least one coil of a second coil length, said second coil length being longer than said first length. a housing for directing fluid flow, a turbine generator having a longitudinal axis of extension, enclosed in said housing, the longitudinal axis being aligned with the direction of fluid flow through the housing and turbine generator, the turbine housing having a transversal axis perpendicular to the longitudinal axis, said turbine generator comprising: a plurality of blades provided on a central rotational axis being parallel with the longitudinal axis, a rotor, and a stator arranged peripherally and annular to the rotor; at least one of the plurality of blades being provided in fixed arrangement with the rotor, and wherein the stator of the turbine generator comprises a plurality of segments each having a coil length parallel to the longitudinal axis of the turbine generator, and a radial coil thickness, wherein at least two stator segments have different coil lengths and/or thickness to each other, wherein the housing has a substantially cylindrical geometry along the transversal axis such that is receivable in a cylindrical bore, and wherein, a lateral region of the stator comprises at least one stator segment having at least one coil of a first coil length, and wherein a transverse region of the stator comprises at least one stator segment having at least one coil of a second coil length, said second coil length being longer than said first length. a plurality of blades provided on a central rotational axis being parallel with the longitudinal axis, a rotor, and a stator arranged peripherally and annular to the rotor; at least one of the plurality of blades being provided in fixed arrangement with the rotor, and wherein the stator of the turbine generator comprises a plurality of segments each having a coil length parallel to the longitudinal axis of the turbine generator, and a radial coil thickness, wherein at least two stator segments have different coil lengths and/or thickness to each other, wherein the housing has a substantially cylindrical geometry along the transversal axis such that is receivable in a cylindrical bore, and wherein, a lateral region of the stator comprises at least one stator segment having at least one coil of a first coil length, and wherein a transverse region of the stator comprises at least one stator segment having at least one coil of a second coil length, said second coil length being longer than said first length.