Is 20 mega watts a lot?
There are 1,000 kW in one MW.
The average American home uses 29 kW per day or 10,600 kW per year. Some use more, some use less.
The plant could power a small city of 5-8 thousand homes every year.
----------
Its enough to power to keep things up and running for a good while if need be.
1 Megawatt = 106 watts
You're off by only a few hundred. 1,000 kW in one MW.