Many of the component parts for the Solar Farms will be sourced from other countries. The production and transportation of these parts will add to the carbon footprint of the project, calling into question it's green credentials from the very start.
Labour practices and quality of products are also issues to cause concern. You can find out more here. If UK-based manufacturing companies were considered for the projects, this would mean more investment and more jobs in this country and a reduced carbon footprint.
Much of the investment in these projects will be made offshore. The local economy will not benefit from these developments.