Yesterday was geothermal, today is a hydropower tour. One of the questions I asked the maintenance crew is how often they shut down. Every year 3 days. Every three years, for about a week. Every 6, 9, and then 12 years the shut downs are longer. With shut down being up to 6 weeks every 12 years. The grid is highly available, but that doesn't mean there aren't maintenance events.
The facility had an access tunnel at the lowest level. This photo came out nicely with 12800 ISO f/4 1/30. No flash, just really big 12800 ISO. Love my Canon 6D.
There is a crane to lift gear in the generator room.
Here are some of rigging and tools for the crane.
The above is the magnetizing of the coils. Below are the generators.
Power is transmitted at 132kV and 220kV.
Here is a video of the water leaving the generators. There is pressure in the discharge area to reduce the pressure differential from inlet to discharge. One of the reasons for reducing the pressure change is too high a differential can create damaging resonances.