NOVELTY - The pipeline (11) has a pump (1111) arranged downstream of an expansion tank (10), and a valve (1112) arranged downstream of the pump. An additional boiler (1201) is arranged downstream of the valve, and heats additional boiler-heat carrier fluid (130) i.e. heat transfer oil. An additional boiler-distribution device (118) is arranged downstream of the boiler and provided for supplying a portion (1301) of the fluid to an evaporator-unit (3) and for supplying another portion (1302) of the fluid to the tank. An additional boiler-collecting device (117) is arranged downstream of the boiler.    USE - Heat carrier fluid-transport-pipeline for conducting heat carrier fluid i.e. heat transfer oil, from an expansion tank to a steam generator unit in a solar power plant i.e. parabolic channel-solar power plant, that is utilized for converting solar energy into electrical energy (all claimed).    ADVANTAGE - The additional boiler-distribution device is arranged downstream of the additional boiler and provided for supplying the fluid to the evaporator-unit and for supplying another portion of the fluid to the expansion tank, thus avoiding the need for additional pumps and valves for controlling the fluid-partial flows, and reducing expenditure of the pipeline. The utilization of only one valve reduces the loss of the fluid during transport. The pipeline ensures controlled transport of the fluid in spite of different pressure conditions.    DETAILED DESCRIPTION - INDEPENDENT CLAIMS are also included for the following:    (1) a solar power plant    (2) a method for operating a solar power plant.    DESCRIPTION OF DRAWING(S) - The drawing shows a hydraulic diagram of a solar power plant with a heat carrier fluid-transport-pipeline.    Evaporator-unit (3)    Expansion tank (10)    Heat carrier fluid-transport-pipeline (11)    Additional boiler-collecting device (117)    Additional boiler-distribution device (118)    Additional boiler-heat carrier fluid (130)    Pump (1111)    Valve (1112)    Additional boiler (1201)    Portions of fluid (1301, 1302)