The River Thames was still thundering over Caversham weir on Friday. All this water has to go somewhere and the high flow rates have increased the river level downstream of the Reading Hydro plant. This reduces the head of water and thus the power output.
Thankfully the flow of over 100 m3/s earlier in the week had started to decrease and continues to do so. We’re gradually getting back to generating at full power, though more rain is forecast for the coming week.