Turlough Hill is a mountain top power generation reservoir near my home - linked by tunnel to a lower lake. I know the manager and have been meaning to talk to him to write a blog. Perhaps there are some metrics he can provide for pump station capacities based on water volume, differential elevation, and distance etc. From memory the process is only about 70% efficient - but it is a relatively old installation. I could arrange a visit if ever have a meet-up in Ireland... notes from no w here
