The turbine is mounted in the space between both mills and above the cárcavo (see 7,8). It looks like both mill and powerstation were powered by the same turbine. The pipes in the cárcavo are telling us about a second turbine situated behind the wall or perhaps removed.
(21, 22) dynamo with some belts, old wiring and a regulator switch
A simple control panel is mounted against the wall. There is a switch at the bottom. It further features a voltmeter (left) an ampère meter and two fuses to secure the circuit.
Pitty I couldn't get the tags clear enough to read them.