A new factory (10MVA power capacity) needs to connect to an existing grid. In this grid extension, which components and connections will you use? Please also illustrate your solution in a diagram with detailed justifications. (60) The factory manager is considering investing in a wind turbine to save electricity bill. What conditions can cause a negative return? Please also justify your answer. (20) Do you have any other solutions to save electricity bill? Please also justify your answer. (20)