NOVELTY - The turbine (100) has a heating system (101) heating the turbine in a power off state and/or a start-up phase of the turbine, and a shaft (103) with an internal hole (105), where the heating system is connectable to the internal hole. The internal hole includes an electrical heating element (106) to provide electrical heating. A housing (102) includes heating coils detachably mounted to outer surface of the housing, and the heating system is connectable to the housing. An insulation system (104) insulates the turbine such that the cooling rate of the turbine in the power off state is reduced.    USE - Turbine e.g. steam turbine and gas turbine, for converting thermal energy into mechanical work, use in power station such as solar power station (claimed) and thermal power station.    ADVANTAGE - The turbine components are heated up and maintained at a minimum temperature level when the ambient temperatures are low during night time, so that the difference between the temperature of the turbine components in an optimal operational state and the temperature at the minimum temperature level is kept constant by the heating system when starting the turbine in the next day, thus reducing the duration of the start-up phase, stress and material fatigue, and achieving an early operational state of the turbine, and hence improving the overall efficiency of a solar power station and lifetime of the turbine. The insulation system comprises insulating materials that are laminated to the outer or inner surfaces of the housing, so the transfer of heat from inside of the turbine to the colder environment of the turbine is reduced. The insulation system is combined with the heating system so as to provide better insulation for preventing the cooling-off of the turbine, and the heat accumulator device stores thermal energy that is taken from the sun, the working fluid and/or the heated up ground, where the stored thermal energy in a heat accumulator device is transferred to the heating system respectively to the turbine components during night time, thus providing an additional possibility to keep the temperature inside the turbine and the temperature of the turbine components constant at a minimum temperature level.    DETAILED DESCRIPTION - INDEPENDENT CLAIMS are also included for the following:    (1) a solar power station comprising a turbine    (2) a method for operating a turbine for converting thermal energy into mechanical work.    DESCRIPTION OF DRAWING(S) - The drawing shows a sectional view of a turbine.    Turbine (100)    Heating system (101)    Housing (102)    Shaft (103)    Insulation system (104)    Internal hole (105)    Electrical heating element (106)