At a U.S. average rate of 12 cents/kWh = $120/MWh = $0.12 million/GWh, that's $947 million worth of power generated per year.
The amount of revenue it generates is not the important consideration in determining if a project is economically worthwhile. It has to generate enough PROFIT to repay the investment. If the annual cost of generating your $947M worth of power is $947M then the project will never repay the cost of building the plant. The cost of generation plus the amortized cost of building and maintaining the plant has to be less than the amount of revenue brought in. Presumably the amount charged for a unit of electricity is high enough to pay for the plant during it's lifetime but you cannot just assume that to be true. In the case of a plant that cost $4.7B to build and is expected to last for 40 years you would need to bring in $117.5M in revenue each year in excess of the operating costs just to break even. And that is ignoring inflation, financing costs, etc. So by your example that electricity had better not cost more than $829.5M per year (actually less than that in the real world) or the plant will not break even.