I continued my progress in the desert. The second power generator I reached had a mini-dungeon like the first one did. I got through it and activated it.
While looking for the third one, I found a crack in a wall and bombed it. A path opened up that let to a heart piece.
Searching around for a while, I eventually found the third power node and activated it. Fortunately, this one wasn’t in a mini-dungeon.
I made my way back to the generator. I just needed to solve a simple puzzle.
Once everything was up and running, a large building rose up out of the sand. It’s the Lanayru Mining Facility.
It appears to be the third dungeon. I was about ready to save my game, but decided to go inside and look around. There was a large room, but the door that led further wouldn’t open and I didn’t see any clear way to progress. I decided I would figure it out next time and saved my game.