NOVELTY - The method (300) involves compressing (302) a process stream to produce a compressed process stream. Non-hydrocarbons are removed (304) from compressed process stream. The compressed process stream is cooled (306), to produce cooled compressed process stream. The first and second portions of natural gas in cooled compressed process stream are cooled (308,310), to generate first and second refrigeration streams. A portion of natural gas in compressed process stream is cooled (312) to a subcritical state with the first and second refrigeration streams, to produce liquefied natural gas.    USE - Method for producing liquefied natural gas.    ADVANTAGE - The electrical energy provided or generated by the power generator can be utilized to drive devices or components of the system, so that the efficiency of the system can be increased. The second heat exchanger can transfer the heat from the process stream to the refrigerant to reduce the temperature of the process stream in line. The letdown valve can be configured to decrease the pressure of the natural gas in the process stream while maintaining the temperature of the natural gas in the process stream. The second refrigeration stream can cool the process stream flowing through the fourth heat exchanger to the subcritical state to produce the liquefied natural gas. The liquid portion of the second refrigeration stream in line can prevent the heat absorbed from the process stream from reducing the temperature of the second refrigeration stream flowing through the fourth heat exchanger. The second recycle stream in line is combined with the process stream in line, so as to decrease the concentration of the non-hydrocarbons in the process stream directed to the separator and to reduce the amount of water or carbon dioxide to be removed by the separator.    DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for system for producing liquefied natural gas.    DESCRIPTION OF DRAWING(S) - The drawing shows a flowchart explaining the process for producing liquefied natural gas.    Liquefied natural gas production method (300)    Step for compressing process stream (302)    Step for removing non-hydrocarbons from compressed process stream (304)    Step for cooling compressed process stream (306)    Step for expanding first portion of natural gas (308)    Step for expanding second portion of natural gas (310)    Step for cooling portion of natural gas to subcritical state with first and second refrigeration streams, to produce liquefied natural gas (312)