A giant wind farm set to be built in Egypt is showcasing how the future of climate tech is increasingly controlled by China. Infinity Power — by some definitions Africa’s biggest renewables company — has an ambitious target of growing its clean-power portfolio nearly tenfold to 10 gigawatts by 2030. Key to its plan will be the country supplying the turbines to generate that electricity: China. “For our 2030 goal, basically, we will, to be honest with you, rely on Chinese products,”...