I have a quite unusual approach for such things:

#1 Add-up the investment costs

#2 Estimate the MWh delivered during operation

#3 Multiply these MWh with the $$$/MWh. This is the revenue position.

#4 The MWh from #2 will require x MWh steam or gas

#5 Multiply gas/steam MWh by the $$$/MWh steam or gas.

#6 Add-up whatever running other costs are arising during operation

(w/o personnel)

Sum the costs:

Invest + steam/gas + other running costs

Subtract 110 % of the costs from the revenues (the 10 % are the margin).

Divide the remainder by the ((average salary per person per annuum) * 20).

This would be a reasonable estimate. Although not all these jobs would be permanent: regarding revisions, repairs etc., a reasonable part of these jobs (I guess 30 .. 50%) will be temporary during revisions, repairs etc. where a lot of (also higher qualified in average) people is "delivering" during a very short period.

Does this approach transpire?

Dear Mehdi Aliehyaei

Everything depends on the degree of automation of the power plant.

A gas diesel power plant usually works without the constant presence of maintenance personnel.

A steam turbine power plant requires at least eight people to service personnel.

Yours sincerely

Therre are a number of factors that should be taken into account to respond to your question. A practical excample, the construction of natural gas power plant in Ohio, USA with a cost between US$ 600 million to US$ 1 billion, and a capacity between 475 y 1,141 MW, will create between 400 y 900 jobs.

@ Jorge Morales Pedraza

These 400 .. 900 jobs would exist for how long: 1 year, 2 years ?

Equalized over a lifespan of 20 years this would result in some 10 .. 90 "equivalent jobs". But these "equivalent jobs" are not permanent and might be included in the investment position.

The number of permanent jobs will depend of several factors. The numebrs of jobs for long-term will depend of the level of automatization of the plant. I do not have this number for the specific example I mentioned to you.