What is the fine-grained topic of the following text: The company has invested US$300, 000 (equivalent to K3.6million) for a 28kilowatt first ever smart solar mini grid plant at Chitandika Village in Chief Chinunda’s area of Chipangali District, about 65 kilometres north of Chipata in Eastern Province. Only return the topic.
Investment in a smart solar mini grid plant at Chitandika Village in Chipangali District.