Looking at the data for lake that goes through the dam, it seems like they keep it at the same level. So it probably CAN make 7MW with more flow, but generally only flows at a state that puts out 2.
7MW is the amount of power you can get from a couple of diesel gensets, waaaay smaller than even a small power plant
[https://www.cat.com/en_US/products/new/power-systems/electri...]
From that https://youtu.be/jvnaiHFT6nQ is a visualization of the water releases for the river to allow the water to get to the right dam for the anticipated power use.