Steam engines only power up as much as it needs to . The performance stat is only showing how much it ' s currently outputting , and available performance is the maximum it can output . So , it ' s just splitting the output over 20 engines instead of 10 . Example you need 11 MW of power and 10 steam engines produces 10 MW . 10 steam engines run at 100 % performance but doesn ' t produce enough power . You added the second line for total of 20 steam engines 20 MW , and now you only need 55 % of 20 MW to fulfill 11 MW usage 55 % performance . <| sep |> It doesn ' t matter which type of bird . A one unit bird cannot carry a fifteen unit dragon bone . <| sep |> Well I know that , but let ' s face it , ain ' t no prohormone standing up to a proper test , mast and tren cycle .