The drought only really effected the south, the north and Scotland still had less water reserves than normal but plenty of capacity left. The hydro generation i

The drought only really effected the south, the north and Scotland still had less water reserves than normal but plenty of capacity left. The hydro generation is mostly based in Scotland. There is also a Welsh hydro-electric dam, excess capacity from the grid pumps the water up the mountain during the night and then it's released as and when.