巴基斯坦采购需求：风力发电机，风力发电，风力涡轮机，垂直轴风力涡轮机，垂直轴风力涡轮机

I would like to inquire about the necessary instruments for utilizing wind turbine electricity. Specifically, could you clarify whether a controller is required for integration or if the electricity can be used directly? Additionally, I'm interested in understanding if there is any fluctuation or variance in power generation based on wind speed and how that might affect overall performance. Furthermore, please provide the HS Code for the product along with an estimate of the import costs to bring it into Pakistan. There are several aspects regarding the product that I am keen to explore, so your prompt and detailed response would be greatly appreciated. Thank you!