A machine (100) for generating energy by exploiting the flow of a fluid, said machine comprising a first fixed or static component part or stator (101) which defines a first substantially cylindrical inner surface (1010) and a second outer surface (1011), said machine (100) further comprising a second component part or rotor (102) adapted to be rotated and accommodated in the inner space (1012) confined by said first substantially cylindrical inner surface (1010), said first fixed or static component part or stator (101) being shaped so as to allow the introduction of a fluid into the inner space (1012) confined by said first inner surface (1010) through said second outer surface (1011) and first inner surface (1010), wherein the interaction between said flow of fluid introduced into said inner space (1012) and said second component part or rotor (102) results in said second component part or rotor (102) being rotated.