I think it is misleading to say everything was in return for only 50 jobs. Data centers require huge investments in development, connectivity, energy supply. All of these things take people to make happen.
This is true...the union halls will be busy with "travelers" to make up for the lack of local IBEW journeyman. There will be a flurry of economic activity during the construction phase but it will taper off eventually as the site completes construction. There will be continual economic activity for the contractors (electricians, pipe fitters, fire protection system technicians, etc.) that will service the data center.
