Please help me with correcting grammar errors of following paragraphs. I appreciate your help!

The diagram provided shows the production of electricity by a hydroelectric dam. This process begins with the water in a reservoir which then passes through a tunnel and ends with the creation of electricity.

In order to generate electricity, the first step is to collect water in a reservoir. Then the water will pass through an intake in the bottom of the dam and enter a long tunnel which is called a penstock.

However, in the second step, the intake is opened, the water flows down the penstock, the pressure it creates is used to spin the turbine. Said turbine is connected to a generator, thereby the momentum powers the generator to produce electricity. At the same time, the water flow s out into the river below the dam. Finally, the power produced is carried away by power lines, which transport the electricity over long distance.

I'm not a writer but I believe that it is at least coherent. I changed some sentences alot for that reason.